CN204349993U - A kind of light-operated gain control circuit and optical receiver - Google Patents
A kind of light-operated gain control circuit and optical receiver Download PDFInfo
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- CN204349993U CN204349993U CN201420761338.4U CN201420761338U CN204349993U CN 204349993 U CN204349993 U CN 204349993U CN 201420761338 U CN201420761338 U CN 201420761338U CN 204349993 U CN204349993 U CN 204349993U
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Abstract
The application discloses a kind of light-operated gain control circuit and optical receiver, described light-operated gain control circuit can gather light signal by automatic gain control circuit, and complete opto-electronic conversion, obtain the signal of telecommunication, gain-adjusted is carried out to the described signal of telecommunication, and via impedance inverter circuit, impedance transformation is carried out to the signal of telecommunication obtained after opto-electronic conversion, first power amplification circuit amplifies the signal of telecommunication after impedance transformation, then the signal of telecommunication after being regulated by automatically controlled attenuator circuit receiving gain, and the signal of telecommunication after amplifying, and Attenuation adjustable is carried out to the signal of telecommunication after described first power amplification circuit amplifies, second power amplification circuit receives the signal of telecommunication after the described Attenuation adjustable of described automatically controlled attenuator circuit output, and the signal of telecommunication after described Attenuation adjustable is amplified, thus can the signal of telecommunication of stable output.During the level regulating optical receiver to export by scheme disclosed in the present application, without the need to manual adjustment, thus save a large amount of cost of labor.
Description
Technical field
The disclosure relates to cable TV network technical field, particularly relates to a kind of light-operated gain control circuit and optical receiver.
Background technology
Along with the deep propelling of broadcasting and TV bidirectional network Transformation, and the fast development of the integration of three networks, current FTTH (Fiber To The Home a, optical fiber directly arrives family) network starts progressively to realize in many regions.In FTTH network, output level, by follow-up link, is transferred to terminal use by optical receiver.But in the entire network, the distance of each optical receiver is different, thus the luminous power causing different optical receivers to receive is different, and accordingly, the output level of optical receiver also can change thereupon the change of luminous power, thus affects the use of terminal use.
In order to ensure that the output level of optical receiver keeps stable in the scope of certain luminous power, at present usual in optical receiver built-in attenuator or attenuator, by manually plugging attenuator, or the mode of Manual Adjust Attenuation device, the level of regulation output.
But, according to manually plugging attenuator, or the level that the mode of Manual Adjust Attenuation device regulates optical receiver to export, need to carry out manual adjustment to each optical receiver, thus consume a large amount of cost of labor.
Utility model content
For overcoming Problems existing in correlation technique, the disclosure provides a kind of light-operated gain control circuit and optical receiver.
In order to solve the problems of the technologies described above, the embodiment of the invention discloses following technical scheme:
According to the first aspect of disclosure embodiment, a kind of light-operated gain control circuit is provided, comprise: the impedance inverter circuit that the automatically controlled attenuator circuit that automatic gain control circuit is connected with described automatic gain control circuit is connected with described automatic gain control circuit, be arranged on the first power amplification circuit between described impedance inverter circuit and described automatically controlled attenuator circuit, and the second power amplification circuit to be connected with described automatically controlled attenuator circuit, wherein
Described light signal is changed into the signal of telecommunication, and carries out gain-adjusted to the described signal of telecommunication after gathering the light signal of optical fiber output by described automatic gain control circuit, and by the electric signal transmission after gain-adjusted to described automatically controlled attenuator circuit;
Described impedance inverter circuit receives the signal of telecommunication that described automatic gain control circuit exports, and carries out impedance transformation to the described signal of telecommunication, realizes impedance matching;
Described first power amplification circuit amplifies the signal of telecommunication after impedance transformation, and by the electric signal transmission after amplification to described automatically controlled attenuator circuit;
Described automatically controlled attenuator circuit is connected with external reference voltage, described automatically controlled attenuator circuit receives the signal of telecommunication after described gain-adjusted, and the signal of telecommunication after described first power amplification circuit amplification, Attenuation adjustable is carried out to the signal of telecommunication after described first power amplification circuit amplifies, and the signal of telecommunication after output attenuatoin adjustment;
Described second power amplification circuit receives the signal of telecommunication after the described Attenuation adjustable of described automatically controlled attenuator circuit output, and amplifies the signal of telecommunication after described Attenuation adjustable.
In conjunction with first aspect, in the first possible implementation of first aspect, described automatic gain control circuit comprises: luminous power Acquisition Circuit, in-phase amplification circuit and non-linear subtraction circuit, wherein,
Described luminous power Acquisition Circuit is connected with described in-phase amplification circuit, described luminous power Acquisition Circuit gathers the light signal that optical fiber exports, and described light signal is changed into the signal of telecommunication, by described electric signal transmission to described in-phase amplification circuit, and by described electric signal transmission to described first power amplification circuit;
Described in-phase amplification circuit is connected with described non-linear subtraction circuit, and described in-phase amplification circuit receives the signal of telecommunication of described luminous power Acquisition Circuit transmission, and amplifies the described signal of telecommunication;
Described non-linear subtraction circuit receives the signal of telecommunication after the amplification of described in-phase amplification circuit transmission, and carries out current compensation to the signal of telecommunication after described amplification, the signal of telecommunication after Drazin inverse.
In conjunction with the first possible implementation of first aspect, in the implementation that first aspect the second is possible, described non-linear subtraction circuit comprises: the subtraction electronic circuit be connected and current compensation negative feedback electronic circuit;
Described subtraction electronic circuit receives the signal of telecommunication after the described amplification of described in-phase amplification circuit transmission, and does subtraction to the signal of telecommunication after described amplification;
Described current compensation negative feedback electronic circuit affords redress to the electric current in described subtraction electronic circuit.
In conjunction with the first possible implementation of first aspect, in the third possible implementation of first aspect, described luminous power Acquisition Circuit comprises:
Photo-detector and the 5th resistance, wherein,
The forward end of described photo-detector is connected with described optical fiber, and negative end is connected with the first end of described 5th resistance, the earth terminal ground connection of described photo-detector;
The first end of described 5th resistance is connected with the negative end of described photo-detector, the second end ground connection.
In conjunction with the first possible implementation of first aspect, in first aspect the 4th kind of possible implementation, described in-phase amplification circuit comprises: the first resistance, the first adjustable potentiometer, the first operational amplifier, the second adjustable potentiometer, the 3rd resistance and the 9th resistance, wherein
The first end ground connection of described first resistance, the second end is connected with the negative input of described first operational amplifier with the first end of described first adjustable potentiometer, the sliding end of described first adjustable potentiometer respectively;
The first end of described first adjustable potentiometer is connected with second end of sliding end with described first resistance, and described first end and sliding end are all connected with the negative input of described first operational amplifier, the second end of described first adjustable potentiometer is connected with the output of described first operational amplifier;
The first end of described 3rd resistance is connected with described luminous power Acquisition Circuit, and the second end is connected with the positive input of described first operational amplifier;
The negative input of described first operational amplifier is connected with sliding end with the first end of the second end of described first resistance, described first adjustable potentiometer, the positive input of described first operational amplifier is connected with the second end of described 3rd resistance, the output of described first operational amplifier and the first end of described second adjustable potentiometer, and the second end of described first adjustable potentiometer is connected;
The first end of the second adjustable potentiometer and the second end of described first adjustable potentiometer, and the output of described first operational amplifier is connected, second end of described second adjustable potentiometer is connected with the first end of described 9th resistance, and the sliding end of described second adjustable potentiometer is connected with described non-linear subtraction circuit;
The first end of described 9th resistance is connected with the second end of described second adjustable potentiometer, the second end ground connection of described 9th resistance.
In conjunction with the implementation that first aspect the second is possible, in first aspect the 5th kind of possible implementation, described subtraction electronic circuit comprises: the second resistance, the 4th resistance, the second operational amplifier, the 6th resistance, the 7th resistance, the 11 resistance and the first voltage-stabiliser tube, wherein
The first end of described 4th resistance is connected with described in-phase amplification circuit, and the second end is connected with the negative input of described second operational amplifier;
The first end of described second resistance is connected with the negative input of described second operational amplifier, and the second end is connected with the output of described second operational amplifier;
The negative input of described second operational amplifier is connected with described second end of the 4th resistance, the first end of the second resistance, the positive input of described second operational amplifier is connected with the second end of described 6th resistance, the first end of the 7th resistance, and the output of described second operational amplifier is connected with described current compensation negative feedback electronic circuit;
The first end ground connection of described 6th resistance, the positive input of the second end and described second operational amplifier, and the first end of the 7th resistance is connected;
The first end of described 7th resistance and the second end of described 6th resistance, and the positive input of described second operational amplifier is connected, second end of described 7th resistance and the first end of described 11 resistance, and the negative end of described first voltage-stabiliser tube is connected;
The first end of described 11 resistance and the second end of described 7th resistance, and the negative end of described first voltage-stabiliser tube is connected, the second end of described 11 resistance is connected with external power supply;
The negative end of described first voltage-stabiliser tube and the second end of described 7th resistance, and the first end of described 11 resistance is connected, the forward end ground connection of described first voltage-stabiliser tube.
In conjunction with the implementation that first aspect the second is possible, in first aspect the 6th kind of possible implementation, described current compensation negative feedback electronic circuit comprises: the 8th resistance, the tenth resistance, the 3rd operational amplifier, triode and the 12 resistance, wherein,
The first end of described 8th resistance and described subtraction electronic circuit, and described automatically controlled attenuator circuit is connected, the second end of described 8th resistance and the first end of described tenth resistance, and the positive input of described 3rd operational amplifier is connected;
The first end of described tenth resistance and the second end of described 8th resistance, and the positive input of described 3rd operational amplifier is connected, the second end ground connection of described tenth resistance;
The positive input of described 3rd operational amplifier and the second end of described 8th resistance, and the first end of described tenth resistance is connected, the negative input of described 3rd operational amplifier is connected with the output of described 3rd operational amplifier, and the output of described 3rd operational amplifier is connected with the transmitting collection end of described triode;
The transmitting collection of described triode is connected with the output of described 3rd operational amplifier, and the base stage of described triode is connected with the collector electrode of described triode, and is jointly connected with the second end of described 12 resistance;
The first end of described 12 resistance is connected with described subtraction electronic circuit.
In conjunction with first aspect, in first aspect the 7th kind of possible implementation, described automatically controlled attenuator circuit comprises: the 13 resistance, the 14 resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the 3rd diode, the 4th diode, the first inductance, the 15 resistance, the 16 resistance and the 17 resistance, wherein
The first end of described 13 resistance and external reference voltage, and the first end of the 14 resistance is connected, the second end of described 13 resistance and described second electric capacity, and the first input end of described 3rd diode is connected;
The first end of described 14 resistance and the first end of described 13 resistance, and described external reference voltage is connected, the second end of described 14 resistance and the second end of described first electric capacity, and the first input end of described 4th diode is connected;
The first end ground connection of described first electric capacity, the second end of the second end and described 14 resistance, and the first input end of described 4th diode is connected;
The first end of described second electric capacity and the second end of described 13 resistance, and the first input end of described 3rd diode is connected, the second end ground connection of described second electric capacity;
Second input of described 3rd diode and the second input of described 4th diode, and the first end of the first inductance is connected, the output of described 3rd diode and the first end of described 16 resistance, and the first end of the 3rd electric capacity is connected;
Second input of described 4th diode and the second input of described 3rd diode, and the first end of the first inductance is connected, the output of described 4th diode and the second end of described 4th electric capacity, and the first end of the 15 resistance is connected;
The first end of described 3rd electric capacity and the output of described 3rd diode, and the first end of the 16 resistance is connected, the signal of telecommunication after the described automatically controlled attenuator circuit Attenuation adjustable of the second end output of described 3rd electric capacity;
The first end of described 4th electric capacity is connected with described automatic gain control circuit, the second end of described 4th electric capacity and the first end of described 15 resistance, and the output of described 4th diode is connected;
The first end of described 15 resistance and the second end of described 4th electric capacity, and the output of described 4th diode is connected, the second end ground connection of described 15 resistance;
The first end of described 16 resistance and the first end of described 3rd electric capacity, and the output of described 3rd diode is connected, the second end ground connection of described 16 resistance;
The first end of described first inductance and the output of described 3rd diode, and the output of the 4th diode is connected, the second end of described first inductance and the second end of described 5th electric capacity, and the first end of described 17 resistance is connected;
The first end ground connection of described 5th electric capacity, the second end of the second end and described first inductance, and the first end of described 17 resistance is connected;
The first end of described 17 resistance and the first end of described 5th electric capacity, and the second end of described first inductance is connected, the second end of described 17 resistance is connected with described automatic gain control circuit.
According to the second aspect of disclosure embodiment, provide a kind of optical receiver,
Light-operated gain control circuit as above is provided with in described optical receiver.
The technical scheme that embodiment of the present disclosure provides can comprise following beneficial effect:
The application discloses a kind of light-operated gain control circuit and optical receiver, and described light-operated gain control circuit comprises automatic gain control circuit, automatically controlled attenuator circuit, impedance inverter circuit, the first power amplification circuit and the second power amplification circuit.Wherein, described light-operated gain control circuit can gather light signal by automatic gain control circuit, and complete opto-electronic conversion, obtain the signal of telecommunication, gain-adjusted is carried out to the described signal of telecommunication, and via impedance inverter circuit, impedance transformation is carried out to the signal of telecommunication obtained after opto-electronic conversion, first power amplification circuit amplifies the signal of telecommunication after impedance transformation, then the signal of telecommunication after being regulated by automatically controlled attenuator circuit receiving gain, and the signal of telecommunication after amplifying, and Attenuation adjustable is carried out to the signal of telecommunication after described first power amplification circuit amplifies, second power amplification circuit receives the signal of telecommunication after the described Attenuation adjustable of described automatically controlled attenuator circuit output, and the signal of telecommunication after described Attenuation adjustable is amplified, thus can the signal of telecommunication of stable output.During the level regulating optical receiver to export by scheme disclosed in the present application, get final product the signal of telecommunication of stable output without the need to manual adjustment, thus save a large amount of human cost.
Should be understood that, it is only exemplary and explanatory that above general description and details hereinafter describe, and can not limit the disclosure.
Accompanying drawing explanation
Accompanying drawing to be herein merged in specification and to form the part of this specification, shows and meets embodiment of the present utility model, and is used from specification one and explains principle of the present utility model;
Fig. 1 is the structural representation of a kind of light-operated gain control circuit according to an exemplary embodiment;
Fig. 2 is in the light-operated gain control circuit of one according to an exemplary embodiment, the structural representation of automatic gain control circuit;
Fig. 3 is in the light-operated gain control circuit of one according to an exemplary embodiment, the structural representation of automatically controlled attenuator circuit;
Fig. 4 is the relation schematic diagram of optical power intensity according to an exemplary embodiment and automatic gain control circuit output voltage.
Embodiment
Here will be described exemplary embodiment in detail, its sample table shows in the accompanying drawings.When description below relates to accompanying drawing, unless otherwise indicated, the same numbers in different accompanying drawing represents same or analogous key element.Execution mode described in following exemplary embodiment does not represent all execution modes consistent with the utility model.On the contrary, they only with as in appended claims describe in detail, the example of apparatus and method that aspects more of the present utility model are consistent.
In order to solve in prior art, during the level regulating optical receiver to export, the problem of a large amount of cost of labor can be consumed, this application discloses a kind of light-operated gain control circuit and optical receiver.
The application discloses a kind of light-operated gain control circuit, described light-operated gain control circuit comprises: the impedance inverter circuit that the automatically controlled attenuator circuit that automatic gain control circuit is connected with described automatic gain control circuit is connected with described automatic gain control circuit, be arranged on the first power amplification circuit between described impedance inverter circuit and described automatically controlled attenuator circuit and the second power amplification circuit be connected with described automatically controlled attenuator circuit.
Wherein, described light signal is changed into the signal of telecommunication, and carries out gain-adjusted to the described signal of telecommunication after gathering the light signal of optical fiber output by described automatic gain control circuit, and by the electric signal transmission after gain-adjusted to described automatically controlled attenuator circuit;
Described impedance inverter circuit receives the signal of telecommunication that described automatic gain control circuit exports, and carries out impedance transformation to the described signal of telecommunication, realizes impedance matching; Wherein, after described automatic gain control circuit gathers the light signal of optical fiber output, described light signal is changed into the signal of telecommunication, and by described electric signal transmission to described impedance inverter circuit, so that described impedance inverter circuit receives the signal of telecommunication that described automatic gain control circuit exports.
Described first power amplification circuit amplifies the signal of telecommunication after impedance transformation, and by the electric signal transmission after amplification to described automatically controlled attenuator circuit;
Described automatically controlled attenuator circuit is connected with external reference voltage, described automatically controlled attenuator circuit receives the signal of telecommunication after described gain-adjusted, and the signal of telecommunication after described first power amplification circuit amplification, Attenuation adjustable is carried out to the signal of telecommunication after described first power amplification circuit amplifies, and the signal of telecommunication after output attenuatoin adjustment;
Described second power amplification circuit receives the signal of telecommunication after the described Attenuation adjustable of described automatically controlled attenuator circuit output, and amplifies the signal of telecommunication after described Attenuation adjustable.
Above-mentioned light-operated gain control circuit disclosed in the present application, comprise: automatic gain control circuit, automatically controlled attenuator circuit, impedance inverter circuit, first power amplification circuit and the second power amplification circuit, described light-operated gain control circuit can gather light signal by automatic gain control circuit, and complete opto-electronic conversion, obtain the signal of telecommunication, gain-adjusted is carried out to the described signal of telecommunication, and via impedance inverter circuit, impedance transformation is carried out to the signal of telecommunication obtained after opto-electronic conversion, first power amplification circuit amplifies the signal of telecommunication after impedance transformation, then the signal of telecommunication after being regulated by automatically controlled attenuator circuit receiving gain, and the signal of telecommunication after amplifying, and Attenuation adjustable is carried out to the signal of telecommunication after described first power amplification circuit amplifies, second power amplification circuit receives the signal of telecommunication after the described Attenuation adjustable of described automatically controlled attenuator circuit output, and the signal of telecommunication after described Attenuation adjustable is amplified, thus can the signal of telecommunication of stable output.During the level regulating optical receiver to export by scheme disclosed in the present application, get final product the signal of telecommunication of stable output without the need to manual adjustment, thus save a large amount of human cost.
See Fig. 1, described automatic gain control circuit comprises: luminous power Acquisition Circuit, in-phase amplification circuit and non-linear subtraction circuit.
Wherein, described luminous power Acquisition Circuit is connected with described in-phase amplification circuit, described luminous power Acquisition Circuit gathers the light signal that optical fiber exports, and described light signal is changed into the signal of telecommunication, by described electric signal transmission to described in-phase amplification circuit, and by described electric signal transmission to described first power amplification circuit;
Described in-phase amplification circuit is connected with described non-linear subtraction circuit, and described in-phase amplification circuit receives the signal of telecommunication of described luminous power Acquisition Circuit transmission, and amplifies the described signal of telecommunication;
Described non-linear subtraction circuit receives the signal of telecommunication after the amplification of described in-phase amplification circuit transmission, and carries out current compensation to the signal of telecommunication after described amplification, the signal of telecommunication after Drazin inverse.
Further, described non-linear subtraction circuit comprises: the subtraction electronic circuit be connected and current compensation negative feedback electronic circuit.
Wherein, described subtraction electronic circuit receives the signal of telecommunication after the described amplification of described in-phase amplification circuit transmission, and does subtraction to the signal of telecommunication after described amplification;
Described current compensation negative feedback electronic circuit affords redress to the electric current in described subtraction electronic circuit.
The circuit diagram of light-operated gain control circuit shown in Figure 2, wherein, described luminous power Acquisition Circuit comprises: photo-detector PD1 and the 5th resistance R5.
Wherein, the forward end of described photo-detector PD1 is connected with described optical fiber, and negative end is connected with the first end of described 5th resistance, the earth terminal ground connection of described photo-detector PD1;
The first end of described 5th resistance R5 is connected with the negative end of described photo-detector, the second end ground connection.
In addition, in described light-operated gain control circuit, described in-phase amplification circuit comprises: the first resistance R1, the first adjustable potentiometer VR1, the first operational amplifier U1A, the second adjustable potentiometer VR2, the 3rd resistance R3 and the 9th resistance R9.
Wherein, the first end ground connection of described first resistance R1, the second end is connected with the negative input of described first operational amplifier U1A with the first end of described first adjustable potentiometer VR1, the sliding end of described first adjustable potentiometer VR1 respectively.
The first end of described first adjustable potentiometer VR1 is connected with second end of sliding end with described first resistance R1, and described first end and sliding end are all connected with the negative input of described first operational amplifier U1A, second end of described first adjustable potentiometer VR1 is connected with the output of described first operational amplifier U1A.
The first end of described 3rd resistance R3 is connected with described luminous power Acquisition Circuit, and the second end is connected with the positive input of described first operational amplifier U1A.Concrete, in the first end of described 3rd resistance R3 and described luminous power Acquisition Circuit, the first end of the 5th resistance R5, and the negative end of photo-detector PD1 is connected.
The negative input of described first operational amplifier U1A is connected with sliding end with the first end of second end of described first resistance R1, described first adjustable potentiometer VR1, the positive input of described first operational amplifier U1A is connected with second end of described 3rd resistance R3, the output of described first operational amplifier U1A and the first end of described second adjustable potentiometer VR2, and second end of described first adjustable potentiometer VR1 is connected.
The first end of the second adjustable potentiometer VR2 and second end of described first adjustable potentiometer VR1, and the output of described first operational amplifier U1A is connected, second end of described second adjustable potentiometer VR2 is connected with the first end of described 9th resistance R9, and the sliding end of described second adjustable potentiometer VR2 is connected with described non-linear subtraction circuit.Concrete, in the sliding end of described second adjustable potentiometer VR2 and described non-linear subtraction circuit, the first end of the 4th resistance R4 is connected.
The first end of described 9th resistance R9 is connected with second end of described second adjustable potentiometer VR2, the second end ground connection of described 9th resistance R9.
In addition, described subtraction electronic circuit comprises: the second resistance R2, the 4th resistance R4, the second operational amplifier U1B, the 6th resistance R6, the 7th resistance R7, the 11 resistance R11 and the first voltage-stabiliser tube D1.
Wherein, the first end of described 4th resistance R4 is connected with described in-phase amplification circuit, and the second end is connected with the negative input of described second operational amplifier U1B.
The first end of described second resistance R2 is connected with the negative input of described second operational amplifier U1B, and the second end is connected with the output of described second operational amplifier U1B.
The negative input of described second operational amplifier U1B is connected with second end of described 4th resistance R4, the first end of the second resistance R2, the positive input of described second operational amplifier U1B is connected with second end of described 6th resistance R6, the first end of the 7th resistance R7, and the output of described second operational amplifier U1B is connected with described current compensation negative feedback electronic circuit.Concrete, in the output of described second operational amplifier U1B and described feedback sub-circuit, the first end of the 8th resistance R8 is connected.
The first end ground connection of described 6th resistance R6, the positive input of the second end and described second operational amplifier U1B, and the first end R7 of the 7th resistance is connected.
The first end of described 7th resistance R7 and second end of described 6th resistance R6, and the positive input of described second operational amplifier U1B is connected, second end of described 7th resistance R7 and the first end of described 11 resistance R11, and the negative end of described first voltage-stabiliser tube D1 is connected.
The first end of described 11 resistance R11 and second end of described 7th resistance R7, and the negative end of described first voltage-stabiliser tube D1 is connected, second end of described 11 resistance R11 is connected with external power supply.
The negative end of described first voltage-stabiliser tube D1 and second end of described 7th resistance R7, and the first end of described 11 resistance R11 is connected, the forward end ground connection of described first voltage-stabiliser tube D1.
In addition, described current compensation negative feedback electronic circuit comprises: the 8th resistance R8, the tenth resistance R10, the 3rd operational amplifier U1C, triode D2 and the 12 resistance R12.
Wherein, the first end of described 8th resistance R8 and described subtraction electronic circuit, and described automatically controlled attenuator circuit is connected, second end of described 8th resistance R8 and the first end of described tenth resistance R10, and the positive input of described 3rd operational amplifier U1C is connected.Wherein, the external circuits that the first end of described 8th resistance R8 connects is automatically controlled attenuator circuit.
The first end of described tenth resistance R10 and second end of described 8th resistance R8, and the positive input of described 3rd operational amplifier U1C is connected, the second end ground connection of described tenth resistance R10.
The positive input of described 3rd operational amplifier U1C and second end of described 8th resistance R8, and the first end of described tenth resistance R10 is connected, the negative input of described 3rd operational amplifier U1C is connected with the output of described 3rd operational amplifier U1C, and the output of described 3rd operational amplifier U1C is connected with the transmitting collection end of described triode D2.
The transmitting collection of described triode D2 is connected with the output of described 3rd operational amplifier U1C, and the base stage of described triode D2 is connected with the collector electrode of described triode D2, and is jointly connected with second end of described 12 resistance R12.
The first end of described 12 resistance R12 is connected with described subtraction electronic circuit.Concrete, in the first end of described 12 resistance R12 and described subtraction electronic circuit, the negative input of second end of the 4th resistance R4, the first end of the second resistance R2 and the second operational amplifier U1B is connected.
See Fig. 3, described automatically controlled attenuator circuit comprises: the 13 resistance R13, the 14 resistance R14, the first electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3, the 4th electric capacity C4, the 5th electric capacity C5, the 3rd diode D3, the 4th diode D4, the first inductance L the 1, the 15 resistance R15, the 16 resistance R16 and the 17 resistance R17.
Described 3rd diode D3 and the 4th diode D4 is generally HSMS-3814 diode, and certainly, also can select the diode of other models, the application does not limit this.
Wherein, the first end of described 13 resistance R13 and described external reference voltage, and the 14 the first end of resistance R14 be connected, second end of described 13 resistance R13 and described second electric capacity C2, and the first input end of described 3rd diode D3 is connected.Wherein, described external reference voltage is used for providing required voltage for described automatically controlled attenuator circuit.In figure 3, described external reference voltage represents with Vref.
The first end of described 14 resistance R14 and the first end of described 13 resistance R13, and described external reference voltage is connected, second end of described 14 resistance R14 and second end of described first electric capacity C1, and the first input end of described 4th diode D4 is connected.Wherein, described external reference voltage is used for providing required voltage for described automatically controlled attenuator circuit.In figure 3, described external reference voltage represents with Vref.
The first end ground connection of described first electric capacity C1, second end of the second end and described 14 resistance R14, and the first input end of described 4th diode D4 is connected;
The first end of described second electric capacity C2 and second end of described 13 resistance R13, and the first input end of described 3rd diode D3 is connected, the second end ground connection of described second electric capacity C2;
Second input of described 3rd diode D3 and second input of described 4th diode D4, and first the first end of inductance L 1 be connected, the output of described 3rd diode D3 and the first end of described 16 resistance R16, and the first end of the 3rd electric capacity C3 is connected;
Second input of described 4th diode D4 and second input of described 3rd diode D3, and first the first end of inductance L 1 be connected, the output of described 4th diode D4 and second end of described 4th electric capacity C4, and the first end of the 15 resistance R15 is connected;
The first end of described 3rd electric capacity C3 and the output of described 3rd diode, and the first end of the 16 resistance is connected, the signal of telecommunication after the described automatically controlled attenuator circuit Attenuation adjustable of the second end output of described 3rd electric capacity C3.
The first end of described 4th electric capacity C4 is connected with described automatic gain control circuit, second end of described 4th electric capacity C4 and the first end of described 15 resistance R15, and the output of described 4th diode D4 is connected; Concrete, in the first end of described 4th electric capacity C4 and described automatic gain control circuit in luminous power Acquisition Circuit, the negative end of photo-detector is connected.
The first end of described 15 resistance R15 and second end of described 4th electric capacity C4, and the output of described 4th diode D4 is connected, the second end ground connection of described 15 resistance R15;
The first end of described 16 resistance R16 and the first end of described 3rd electric capacity C3, and the output of described 3rd diode D3 is connected, the second end ground connection of described 16 resistance R16;
The first end of described first inductance L 1 and the output of described 3rd diode D3, and the 4th the output of diode D4 be connected, second end of described first inductance L 1 and second end of described 5th electric capacity C5, and the first end of described 17 resistance R17 is connected;
The first end ground connection of described 5th electric capacity C5, the second end of the second end and described first inductance L 1, and the first end of described 17 resistance R17 is connected;
The first end of described 17 resistance R17 and the first end of described 5th electric capacity C5, and the second end of described first inductance L 1 is connected, second end of described 17 resistance R17 is connected with described automatic gain control circuit.Concrete, in the non-linear subtraction circuit in second end of described 17 resistance R17 and described automatic gain control circuit, the first end of the 8th resistance R8, and the output of the second operational amplifier U1B is connected.
In addition, the first end of described impedance inverter circuit is connected with described automatic gain control circuit, and the second end is connected with described first power amplification circuit.Concrete, in the first end of described impedance inverter circuit and described automatic gain control circuit, the first end of the 5th resistance R5, and the negative end of photo-detector PD1 is connected.
The first end of described first power amplification circuit is connected with described impedance inverter circuit, and the second end is connected with described automatically controlled attenuator circuit.Concrete, the second end of described first power amplification circuit is connected with the first end of the 4th electric capacity C4 in described automatically controlled attenuator circuit.
In addition, the first end of the 4th electric capacity C4 in described automatically controlled attenuator circuit, by described impedance inverter circuit and the first power amplification circuit, is connected with the luminous power Acquisition Circuit in described automatic gain control circuit.
The first end of described second power amplification circuit is connected with described automatically controlled attenuator circuit, and the second end is the output of the signal of telecommunication.Concrete, the first end of described second power amplification circuit is with described automatically controlled attenuator circuit, and second end of the 3rd electric capacity C3 is connected, the signal of telecommunication that described second power amplification circuit transmits for receiving described automatically controlled attenuator circuit.
In light-operated gain control circuit disclosed in the present application, described luminous power Acquisition Circuit can gather light signal, and according to optical power intensity, described light signal is changed into the corresponding signal of telecommunication, exports sampled voltage U1.
Described in-phase amplification circuit, carries out homophase amplification, output voltage U2, voltage U by the magnitude of voltage U1 that luminous power Acquisition Circuit exports
2again by the second adjustable potentiometer VR2 dividing potential drop according to a certain percentage, output voltage U
3, and by voltage U
3transfer to non-linear subtraction circuit.
Described non-linear subtraction circuit is receiving described voltage U
3after, adjusted, output voltage U
c, and by described voltage U
ctransfer to automatically controlled attenuator circuit.
In addition, described voltage U
cin the dividing potential drop through resistance R8, and after the 3rd operational amplifier, output voltage U
7.Voltage U
7transfer to the emitter of triode D2, the base stage of described triode D2 is connected with collector electrode, and described base stage and collector electrode, be all connected with second end of resistance R12, and the first end of resistance R12 is connected with the negative input of the second operational amplifier, form negative feedback loop thus.
Second end of the 11 resistance R11 in described non-linear subtraction circuit is also connected with external power supply, and R11 receives the voltage of this external power supply transmission, output voltage U
6.
Light-operated gain control circuit disclosed in the present application, is converted into the signal of telecommunication by the light signal received, and realizes the adjustment to the signal of telecommunication, exports the comparatively stable signal of telecommunication to make light-operated gain control circuit.Wherein, described automatic gain control circuit gathers the light signal that optical fiber exports, and carry out opto-electronic conversion, gain-adjusted is carried out to the signal of telecommunication got, and via impedance inverter circuit, impedance transformation is carried out to the signal of telecommunication obtained after opto-electronic conversion, first power amplification circuit amplifies the signal of telecommunication after impedance transformation, then the signal of telecommunication after being regulated by automatically controlled attenuator circuit receiving gain, and the signal of telecommunication after amplifying, and Attenuation adjustable is carried out to the signal of telecommunication after described first power amplification circuit amplifies, second power amplification circuit receives the signal of telecommunication after the described Attenuation adjustable of described automatically controlled attenuator circuit output, and rear output is amplified to the signal of telecommunication after described Attenuation adjustable.Experiment shows, when the luminous power that automatic gain control circuit collects raises 1dBm, the level of the signal of telecommunication that automatic gain control circuit exports can increase 2dBuV accordingly, and according to application scenarios, the luminous power of Optical Fiber Transmission is floated within the specific limits, and therefore, the level exported to keep optical receiver keeps basicly stable, automatically controlled attenuator circuit, after the signal of telecommunication receiving automatic gain control circuit transmission, needs adjusted.
In described automatically controlled attenuator circuit, core devices is the 3rd diode D3 and the 4th diode D4, D3 and D4 can be HSMS-3814 transistor, and certainly, also can be the transistor of other models, the application limit this.When the direct current of different size is by D3 and D4, for high-frequency signal, D3 and D4 can present different impedances, according to this characteristic, automatically controlled attenuator circuit constructs a π type voltage-controlled attenuator, by resistance in rational configuration circuit, the specification of the devices such as electric capacity, and suitable reference voltage is set, automatically controlled attenuator circuit is made to receive suitable external voltage Vref, the pad value of automatically controlled attenuator circuit changes accordingly, Attenuation adjustable is carried out to the signal of telecommunication that automatic gain control circuit transmits, thus ensure that the signal of telecommunication that light-operated gain control circuit exports maintains basic state.
In order to clear and definite automatic gain control circuit and automatically controlled attenuator circuit are to the regulating action of the signal of telecommunication, the application calculates the situation of change of voltage in circuit.
The optical power intensity of the optical fiber that setting photo-detector PD1 collects is P, obtains detecting circuit U through sampling resistor R5
1, then:
Wherein, U
1for detecting circuit, unit is V; P is optical power intensity, and unit is dBm; α is the responsiveness of PD1, and described responsiveness is PD1 inherent characteristic, and unit is A/W; R
5be the resistance of the 5th resistance R5, unit is Ω.
Luminous power Acquisition Circuit is by voltage U
1after transferring to in-phase amplification circuit, through the first operational amplifier U1A, homophase amplifies A doubly, wherein, by the adjustable enlargement ratio A of the first adjustable potentiometer VR1 in in-phase amplification circuit.
The voltage setting the first operational amplifier U1A output is U
2, then can draw following formula:
U
2=A*U
1(formula 2).
Wherein, U
2unit be V.
In order to eliminate the responsiveness because of PD1, and the error that in luminous power Acquisition Circuit and in-phase amplification circuit, the reason such as resistance precision causes, the second adjustable potentiometer VR2 is regulated, thus through the second adjustable potentiometer VR2, exports and obtain voltage U
3, obtain following formula:
U
3=B*U
2(formula 3).
Wherein, B is the electric resistance partial pressure ratio of adjustable potentiometer; U
2for the output voltage of in-phase amplification circuit.
Described output voltage U
3be connected to the negative input of the second operational amplifier U1B via resistance R4, resistance R2 is connected across negative input and output, and the external power supply Vcc of R11 second end is through R11 and voltage-stabiliser tube D1, output voltage U
6, output voltage U
6through resistance R6, R7 pressure-dividing output voltage value U
5, and be connected with the second operational amplifier U1B positive input, form subtraction electronic circuit.
Described output voltage U
3be connected to the negative input of operational amplifier U1B via resistance R4, resistance R2 is connected across negative input and output; Power Vcc is via resistance R11 and voltage stabilizing didoe D1, output voltage U
6.Output voltage U
6through resistance R6, R7 pressure-dividing output voltage value U
5.Its output is connected to operational amplifier U1B in-phase input end, and this forms non-linear subtraction circuit.
The voltage that in setting subtraction electronic circuit, the second operational amplifier exports is U
c ,, then obtain following formula:
Wherein, R
6be the resistance of the 6th resistance R6, R
7be the resistance of the 7th resistance R7, R
2be the resistance of the second resistance R3, R
4be the resistance of the 4th resistance R4, the unit of the resistance of each resistance is Ω; U
5represent the voltage of the in-phase input end of the second amplifier, unit is V; U
c ,represent the output voltage of the second operational amplifier U1B, the control voltage Uc namely in automatically controlled attenuator circuit, unit is V; I
3represent the electric current through resistance R12, unit is A; U
6represent the magnitude of voltage after D1 voltage stabilizing, unit is V.
The output voltage of described second operational amplifier U1B, after resistance R8, R10 dividing potential drop, then through the 3rd operational amplifier U1C, voltage U
7output voltage U7 is connected to the transmitting collection of triode D2, and the base stage of described triode D2 is connected with collector electrode, and it exports the second end being connected to resistance R12, and the first end of resistance R12 is connected to the reverse input end of the second operational amplifier U1B, form current compensation negative feedback electronic circuit thus.
The voltage that setting feedback sub-circuit exports is U
c ", then can draw following formula:
In above-mentioned formula, VT=KT/q, wherein, I
sfor the anti-phase saturation current of triode D2, unit is A; V
tfor the voltage equivalent of temperature; K is Boltzmann constant; Q is electron charge; T is thermodynamic temperature; R
8be the resistance of the 8th resistance R8, R
10be the resistance of the tenth resistance R10, R
12be the resistance of the 12 resistance R12, the unit of the resistance of each resistance is Ω.
Due to U
c ,and U
c "equal, by above-mentioned formula 4,5 and 7 simultaneous, and meet U
c ,=U
c "this condition, can obtain electric current I
3with U
3corresponding relation, and via formula 1,2,3 do the corresponding relation that conversion can obtain I3 and luminous power P.
Through above-mentioned formula, and the voltage setting automatic gain control circuit output is U
c, following formula can be obtained:
Wherein, U
cfor the voltage that automatic gain control circuit exports, this voltage is transferred to automatically controlled attenuator circuit by automatic gain control circuit, and unit is V.
According to above-mentioned calculating, optical power intensity and voltage U can be drawn
cbetween corresponding relation, as shown in Figure 4, in this figure, abscissa represents optical power intensity to its graph of a relation, and unit is dBm, and ordinate represents voltage U
c, unit is V.
In addition, according to Fig. 4 and formula 8, the voltage that automatic gain control circuit exports is U
cthe change of regularity with the change of the luminous power of optical fiber, and according to application scenarios, the luminous power of Optical Fiber Transmission is floated within the specific limits.In this case, according to U
cchange, the pad value of automatically controlled attenuator circuit can change accordingly, can to U
ccarry out corresponding Attenuation adjustable, thus the signal of telecommunication that light-operated gain control circuit is exported remains on basicly stable state.
See table 1, table 1 is optical power intensity P, the pad value of automatically controlled attenuator circuit and voltage U
cbetween mapping table.In this table for optical power change scope at-16 ~-8dBm, known by this table, when the luminous power of the light signal that light-operated gain control circuit collects changes, the voltage U that automatically controlled attenuator circuit receives
cmeeting there is corresponding change, and according to U
cchange, the pad value of described automatically controlled attenuator circuit also there occurs change, thus to voltage U
ccarry out corresponding Attenuation adjustable, make the signal of telecommunication of output maintain stable state.
Table 1
| Luminous power | Pad value | Voltage (unit: V) |
| -16 | 3.5 | 2.85 |
| -15 | 5 | 2.42 |
| -14 | 7 | 2.1 |
| -13 | 9 | 1.85 |
| -12 | 11 | 1.64 |
| -11 | 13 | 1.48 |
| -10 | 15 | 1.37 |
| -9 | 17 | 1.27 |
| -8 | 19 | 1.2 |
Experimentally known, adopt light-operated gain control circuit disclosed in the present application, light signal can be converted into the signal of telecommunication, and the signal of telecommunication is regulated, thus enable light-receiving export the basicly stable signal of telecommunication.Experimentally known, the control precision of light-operated gain circuitry disclosed in the present application can remain on ± 1dB in.
Accordingly, the application also discloses a kind of optical receiver, comprises light-operated gain control circuit as above in described optical receiver.
Wherein, described light-operated gain control circuit comprises: the impedance inverter circuit that the automatically controlled attenuator circuit that automatic gain control circuit is connected with described automatic gain control circuit is connected with described automatic gain control circuit, be arranged on the first power amplification circuit between described impedance inverter circuit and described automatically controlled attenuator circuit and the second power amplification circuit be connected with described automatically controlled attenuator circuit.Wherein,
Described light signal is changed into the signal of telecommunication, and carries out gain-adjusted to the described signal of telecommunication after gathering the light signal of optical fiber output by described automatic gain control circuit, and by the electric signal transmission after gain-adjusted to described automatically controlled attenuator circuit;
Described impedance inverter circuit receives the signal of telecommunication that described automatic gain control circuit exports, and carries out impedance transformation to the described signal of telecommunication, realizes impedance matching;
Described first power amplification circuit amplifies the signal of telecommunication after impedance transformation, and by the electric signal transmission after amplification to described automatically controlled attenuator circuit;
Described automatically controlled attenuator circuit is connected with external reference voltage, described automatically controlled attenuator circuit receives the signal of telecommunication after described gain-adjusted, and the signal of telecommunication after described first power amplification circuit amplification, Attenuation adjustable is carried out to the signal of telecommunication after described first power amplification circuit amplifies, and the signal of telecommunication after output attenuatoin adjustment;
Described second power amplification circuit receives the signal of telecommunication after the described Attenuation adjustable of described automatically controlled attenuator circuit output, and amplifies the signal of telecommunication after described Attenuation adjustable.
About the device in above-described embodiment, wherein the concrete mode of modules executable operations has been described in detail in about the embodiment of the method, will not elaborate explanation herein.
Those skilled in the art, at consideration specification and after putting into practice utility model disclosed herein, will easily expect other embodiment of the present utility model.The application is intended to contain any modification of the present utility model, purposes or adaptations, and these modification, purposes or adaptations are followed general principle of the present utility model and comprised the undocumented common practise in the art of the disclosure or conventional techniques means.Specification and embodiment are only regarded as exemplary, and true scope of the present utility model and spirit are pointed out by claim below.
Should be understood that, the utility model is not limited to precision architecture described above and illustrated in the accompanying drawings, and can carry out various amendment and change not departing from its scope.Scope of the present utility model is only limited by appended claim.
Claims (9)
1. a light-operated gain control circuit, it is characterized in that, comprise: the impedance inverter circuit that the automatically controlled attenuator circuit that automatic gain control circuit is connected with described automatic gain control circuit is connected with described automatic gain control circuit, be arranged on the first power amplification circuit between described impedance inverter circuit and described automatically controlled attenuator circuit, and the second power amplification circuit to be connected with described automatically controlled attenuator circuit, wherein
Described light signal is changed into the signal of telecommunication, and carries out gain-adjusted to the described signal of telecommunication after gathering the light signal of optical fiber output by described automatic gain control circuit, and by the electric signal transmission after gain-adjusted to described automatically controlled attenuator circuit;
Described impedance inverter circuit receives the signal of telecommunication that described automatic gain control circuit exports, and carries out impedance transformation to the described signal of telecommunication, realizes impedance matching;
Described first power amplification circuit amplifies the signal of telecommunication after impedance transformation, and by the electric signal transmission after amplification to described automatically controlled attenuator circuit;
Described automatically controlled attenuator circuit is connected with external reference voltage, described automatically controlled attenuator circuit receives the signal of telecommunication after described gain-adjusted, and the signal of telecommunication after described first power amplification circuit amplification, Attenuation adjustable is carried out to the signal of telecommunication after described first power amplification circuit amplifies, and the signal of telecommunication after output attenuatoin adjustment;
Described second power amplification circuit receives the signal of telecommunication after the described Attenuation adjustable of described automatically controlled attenuator circuit output, and amplifies the signal of telecommunication after described Attenuation adjustable.
2. light-operated gain control circuit according to claim 1, is characterized in that, described automatic gain control circuit comprises: luminous power Acquisition Circuit, in-phase amplification circuit and non-linear subtraction circuit, wherein,
Described luminous power Acquisition Circuit is connected with described in-phase amplification circuit, described luminous power Acquisition Circuit gathers the light signal that optical fiber exports, and described light signal is changed into the signal of telecommunication, by described electric signal transmission to described in-phase amplification circuit, and by described electric signal transmission to described first power amplification circuit;
Described in-phase amplification circuit is connected with described non-linear subtraction circuit, and described in-phase amplification circuit receives the signal of telecommunication of described luminous power Acquisition Circuit transmission, and amplifies the described signal of telecommunication;
Described non-linear subtraction circuit receives the signal of telecommunication after the amplification of described in-phase amplification circuit transmission, and carries out current compensation to the signal of telecommunication after described amplification, the signal of telecommunication after Drazin inverse.
3. light-operated gain control circuit according to claim 2, is characterized in that, described non-linear subtraction circuit comprises: the subtraction electronic circuit be connected and current compensation negative feedback electronic circuit;
Described subtraction electronic circuit receives the signal of telecommunication after the described amplification of described in-phase amplification circuit transmission, and does subtraction to the signal of telecommunication after described amplification;
Described current compensation negative feedback electronic circuit affords redress to the electric current in described subtraction electronic circuit.
4. light-operated gain control circuit according to claim 2, is characterized in that, described luminous power Acquisition Circuit comprises:
Photo-detector and the 5th resistance, wherein,
The forward end of described photo-detector is connected with described optical fiber, and negative end is connected with the first end of described 5th resistance, the earth terminal ground connection of described photo-detector;
The first end of described 5th resistance is connected with the negative end of described photo-detector, the second end ground connection.
5. light-operated gain control circuit according to claim 2, is characterized in that, described in-phase amplification circuit comprises: the first resistance, the first adjustable potentiometer, the first operational amplifier, the second adjustable potentiometer, the 3rd resistance and the 9th resistance, wherein,
The first end ground connection of described first resistance, the second end is connected with the negative input of described first operational amplifier with the first end of described first adjustable potentiometer, the sliding end of described first adjustable potentiometer respectively;
The first end of described first adjustable potentiometer is connected with second end of sliding end with described first resistance, and described first end and sliding end are all connected with the negative input of described first operational amplifier, the second end of described first adjustable potentiometer is connected with the output of described first operational amplifier;
The first end of described 3rd resistance is connected with described luminous power Acquisition Circuit, and the second end is connected with the positive input of described first operational amplifier;
The negative input of described first operational amplifier is connected with sliding end with the first end of the second end of described first resistance, described first adjustable potentiometer, the positive input of described first operational amplifier is connected with the second end of described 3rd resistance, the output of described first operational amplifier and the first end of described second adjustable potentiometer, and the second end of described first adjustable potentiometer is connected;
The first end of the second adjustable potentiometer and the second end of described first adjustable potentiometer, and the output of described first operational amplifier is connected, second end of described second adjustable potentiometer is connected with the first end of described 9th resistance, and the sliding end of described second adjustable potentiometer is connected with described non-linear subtraction circuit;
The first end of described 9th resistance is connected with the second end of described second adjustable potentiometer, the second end ground connection of described 9th resistance.
6. light-operated gain control circuit according to claim 3, is characterized in that, described subtraction electronic circuit comprises: the second resistance, the 4th resistance, the second operational amplifier, the 6th resistance, the 7th resistance, the 11 resistance and the first voltage-stabiliser tube, wherein,
The first end of described 4th resistance is connected with described in-phase amplification circuit, and the second end is connected with the negative input of described second operational amplifier;
The first end of described second resistance is connected with the negative input of described second operational amplifier, and the second end is connected with the output of described second operational amplifier;
The negative input of described second operational amplifier is connected with described second end of the 4th resistance, the first end of the second resistance, the positive input of described second operational amplifier is connected with the second end of described 6th resistance, the first end of the 7th resistance, and the output of described second operational amplifier is connected with described current compensation negative feedback electronic circuit;
The first end ground connection of described 6th resistance, the positive input of the second end and described second operational amplifier, and the first end of the 7th resistance is connected;
The first end of described 7th resistance and the second end of described 6th resistance, and the positive input of described second operational amplifier is connected, second end of described 7th resistance and the first end of described 11 resistance, and the negative end of described first voltage-stabiliser tube is connected;
The first end of described 11 resistance and the second end of described 7th resistance, and the negative end of described first voltage-stabiliser tube is connected, the second end of described 11 resistance is connected with external power supply;
The negative end of described first voltage-stabiliser tube and the second end of described 7th resistance, and the first end of described 11 resistance is connected, the forward end ground connection of described first voltage-stabiliser tube.
7. light-operated gain control circuit according to claim 3, is characterized in that, described current compensation negative feedback electronic circuit comprises: the 8th resistance, the tenth resistance, the 3rd operational amplifier, triode and the 12 resistance, wherein,
The first end of described 8th resistance and described subtraction electronic circuit, and described automatically controlled attenuator circuit is connected, the second end of described 8th resistance and the first end of described tenth resistance, and the positive input of described 3rd operational amplifier is connected;
The first end of described tenth resistance and the second end of described 8th resistance, and the positive input of described 3rd operational amplifier is connected, the second end ground connection of described tenth resistance;
The positive input of described 3rd operational amplifier and the second end of described 8th resistance, and the first end of described tenth resistance is connected, the negative input of described 3rd operational amplifier is connected with the output of described 3rd operational amplifier, and the output of described 3rd operational amplifier is connected with the transmitting collection end of described triode;
The transmitting collection of described triode is connected with the output of described 3rd operational amplifier, and the base stage of described triode is connected with the collector electrode of described triode, and is jointly connected with the second end of described 12 resistance;
The first end of described 12 resistance is connected with described subtraction electronic circuit.
8. light-operated gain control circuit according to claim 1, it is characterized in that, described automatically controlled attenuator circuit comprises: the 13 resistance, the 14 resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the 3rd diode, the 4th diode, the first inductance, the 15 resistance, the 16 resistance and the 17 resistance, wherein
The first end of described 13 resistance and external reference voltage, and the first end of the 14 resistance is connected, the second end of described 13 resistance and described second electric capacity, and the first input end of described 3rd diode is connected;
The first end of described 14 resistance and the first end of described 13 resistance, and described external reference voltage is connected, the second end of described 14 resistance and the second end of described first electric capacity, and the first input end of described 4th diode is connected;
The first end ground connection of described first electric capacity, the second end of the second end and described 14 resistance, and the first input end of described 4th diode is connected;
The first end of described second electric capacity and the second end of described 13 resistance, and the first input end of described 3rd diode is connected, the second end ground connection of described second electric capacity;
Second input of described 3rd diode and the second input of described 4th diode, and the first end of the first inductance is connected, the output of described 3rd diode and the first end of described 16 resistance, and the first end of the 3rd electric capacity is connected;
Second input of described 4th diode and the second input of described 3rd diode, and the first end of the first inductance is connected, the output of described 4th diode and the second end of described 4th electric capacity, and the first end of the 15 resistance is connected;
The first end of described 3rd electric capacity and the output of described 3rd diode, and the first end of the 16 resistance is connected, the signal of telecommunication after the described automatically controlled attenuator circuit Attenuation adjustable of the second end output of described 3rd electric capacity;
The first end of described 4th electric capacity is connected with described automatic gain control circuit, the second end of described 4th electric capacity and the first end of described 15 resistance, and the output of described 4th diode is connected;
The first end of described 15 resistance and the second end of described 4th electric capacity, and the output of described 4th diode is connected, the second end ground connection of described 15 resistance;
The first end of described 16 resistance and the first end of described 3rd electric capacity, and the output of described 3rd diode is connected, the second end ground connection of described 16 resistance;
The first end of described first inductance and the output of described 3rd diode, and the output of the 4th diode is connected, the second end of described first inductance and the second end of described 5th electric capacity, and the first end of described 17 resistance is connected;
The first end ground connection of described 5th electric capacity, the second end of the second end and described first inductance, and the first end of described 17 resistance is connected;
The first end of described 17 resistance and the first end of described 5th electric capacity, and the second end of described first inductance is connected, the second end of described 17 resistance is connected with described automatic gain control circuit.
9. an optical receiver, is characterized in that,
The light-operated gain control circuit as described in any one of claim 1 to 8 is provided with in described optical receiver.
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|---|---|---|---|
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106341189A (en) * | 2016-09-14 | 2017-01-18 | 青岛海信宽带多媒体技术有限公司 | Optical module |
| CN108282231A (en) * | 2018-01-11 | 2018-07-13 | 向祖璧 | A kind of small-sized FTTH photoreceivers hardware circuit |
-
2014
- 2014-12-05 CN CN201420761338.4U patent/CN204349993U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106341189A (en) * | 2016-09-14 | 2017-01-18 | 青岛海信宽带多媒体技术有限公司 | Optical module |
| CN106341189B (en) * | 2016-09-14 | 2019-08-09 | 青岛海信宽带多媒体技术有限公司 | Optical module |
| CN108282231A (en) * | 2018-01-11 | 2018-07-13 | 向祖璧 | A kind of small-sized FTTH photoreceivers hardware circuit |
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Address after: 201807 Shanghai City, north of the city of Jiading District Road No. 1355 building 4 layer D Patentee after: Lingyun Tianbo Photoelectric Technology Co., Ltd. Address before: 201807 Shanghai City, north of the city of Jiading District Road No. 1355 building 4 layer D Patentee before: Shanghai Teraband Photonics Co., Ltd. |