CN208538007U - Across resistance amplifying circuit and communication device - Google Patents

Abstract

This disclosure relates to a kind of across resistance amplifying circuit and communication device.One kind is across resistance amplifying circuit, comprising: amplifying circuit, with input terminal and output end, the amplifying circuit is configured as obtaining input current by the input terminal, and generates output voltage in the output end；And negative-feedback circuit, it is connect with the amplifying circuit, and be configured as adjusting the voltage of the input terminal according to the difference of the output voltage and reference voltage when the input current changes.A kind of communication device, with reception device, the reception device includes described across resistance amplifying circuit.

Description

Across resistance amplifying circuit and communication device

Technical field

This application involves amplifying circuits, more particularly to one kind across resistance amplifying circuit and communication device.

Background technique

Explanation and example are since it includes be considered as the prior art in this chapters and sections below.

Trans-impedance amplifier (Transimpedance Amplifier, TIA) is commonly used in being converted to input current signal Corresponding output voltage signal.Trans-impedance amplifier is commonly used in receiving current signal from preceding level detection circuitry, examines from previous stage The current signal of slowdown monitoring circuit output is received by trans-impedance amplifier and is converted to and can be handled by the processor of trans-impedance amplifier rear stage Corresponding voltage signal.Wherein, previous stage detection circuit is usually senser element, and the processor of rear stage is commonly used in processing electricity Press signal.

Utility model content

One of embodiment of this exposure is to provide a kind of across resistance amplifying circuit, comprising: amplifying circuit, with input terminal And output end, the amplifying circuit are configured as obtaining input current by the input terminal, and defeated in output end generation Voltage out；And negative-feedback circuit, it is connect with the amplifying circuit, and be configured as when the input current changes, according to The difference of the output voltage and reference voltage adjusts the voltage of the input terminal.

This exposure embodiment additionally provides a kind of communication device, and with reception device, the reception device includes above-mentioned Across resistance amplifying circuit.

Detailed description of the invention

It is the electrical block diagram across resistance amplifying circuit of one embodiment of this exposure shown in Fig. 1.

It is the electrical block diagram across resistance amplifying circuit of one embodiment of this exposure shown in Fig. 2.

It is the electrical block diagram across resistance amplifying circuit of one embodiment of this exposure shown in Fig. 3.

It is the electrical block diagram across resistance amplifying circuit of one embodiment of this exposure shown in Fig. 4.

It is the electrical block diagram across resistance amplifying circuit of one embodiment of this exposure shown in Fig. 5.

It is the electrical block diagram across resistance amplifying circuit of one embodiment of this exposure shown in Fig. 6.

Specific embodiment

This exposure embodiment provides many different embodiments or example of the different characteristic for implementing this exposure embodiment. The particular instance of component and arrangement is described below to simplify this exposure embodiment.

For ease of description, " first ", " second ", " third " etc. can be used to distinguish herein a figure or a series of figures Different components." first ", " second ", " third " etc. are not intended to describe corresponding component.

It is as shown in Figure 1 the structural schematic diagram across resistance amplifying circuit of one embodiment of this exposure.It should be across resistance amplifying circuit packet Include input, output end V_OUT, the first transistor M₁, second transistor M₂, first resistor device R_F, second resistor R_L, it is first straight Stream source I_DC1With the second DC source I_DC2。

According to one embodiment of this exposure, the first transistor M₁Grid can be used as the input terminal and the across resistance amplifying circuit Two-transistor M₂Source electrode can be used as this across resistance amplifying circuit output end V_OUT.The first transistor M₁Grid be configured to receive The input current i provided by photoelectric induction device PD_IN1, wherein photoelectric induction device PD can be photodiode, but not It is defined in this.The other end of photoelectric induction device PD and the first feeder ear V_DD1Connection, the first feeder ear V_DD1For giving photoelectricity Sensing device PD provides operating voltage.First resistor device R_FBe connected to the first transistor M₁Grid and output end V_OUTBetween. The first transistor M₁Source electrode connect with ground terminal GND, the first transistor M₁Drain electrode connect second resistor R_LOne end, Two resistor R_LThe other end and the second feeder ear V_DD2Electrical connection.Second transistor M₂Grid and the first transistor M₁Drain electrode Connection, the drain electrode of second transistor and the second feeder ear V_DD2Connection.First DC source I_DC1It is series at second transistor M₂Source Between pole and ground terminal GND.Second DC source I_DC2With second resistor R_LIt is connected in parallel.According to one embodiment of this exposure, second DC source I_DC2It is configured to provide electric current I_DC3To the first transistor M₁Drain electrode.

It is single ended input across resistance amplifying circuit across resistance amplifying circuit, the optical signal that photoelectric induction device PD is incuded turns Become current signal i_IN1, it is defeated this should to be received across resistance amplifying circuit as the single-ended input current signal across resistance amplifying circuit Enter current signal and with amplified voltage signal from output end V_OUTOutput.This is realized across resistance amplifying circuit to current signal Linear Amplifer.The received photosignals of photoelectric induction device PD institute usually have very big dynamic range, when input current compared with When greatly and being more than the linear input range across resistance amplifying circuit, the linearity reduced performance across resistance amplifying circuit can be made, from And limit the application across resistance amplifying circuit.

It is illustrated in figure 2 the structural schematic diagram across resistance amplifying circuit of one embodiment of this exposure.It should be across resistance amplifying circuit packet Include input terminal I_IN, output end V_OUT, the first transistor Q₁, second transistor Q₂, third transistor Q₃, first resistor device R_f, second Resistor R_CWith the first DC source I_DC1.According to one embodiment of this exposure, the first transistor Q₁Base stage as should across resistance amplification electricity The input terminal I on road_IN, and second transistor Q₂Collector as this across resistance amplifying circuit output end V_OUT.The first transistor Q₁ Emitter connect with ground terminal, the first transistor Q₁Collector and second transistor Q₂Emitter connection, second transistor Q₂Collector and second resistor R_COne end connection, second transistor Q₂Base stage for connecting biasing circuit, biasing circuit For for second transistor Q₂Base stage provide bias voltage V_bias.Second resistor R_CThe other end and feeder ear V_CCConnection. Third transistor Q₃Base stage and second transistor Q₂Collector connection, output end V_OUTWith second resistor R_COne end connect It connects.Third transistor Q₃Collector and feeder ear V_CCConnection, the first DC source I_DC1It is connected to first resistor device R_fOne end Between ground terminal.First resistor device R_fIt is connected to the first transistor Q₁Base stage and third transistor Q₃Emitter between.

For single-ended second resistor R should be flowed through across resistance amplifying circuit_CQuiescent current be equal to (vcc-vbe1-vbe3)/ Rc, wherein vcc is feeder ear V_CCVoltage value, vbe1 be the first transistor Q₁Base stage and emitter between PN junction voltage Voltage value, vbe3 are third transistor Q₃Base stage and emitter between PN junction voltage voltage value, rc be second resistor R_C Resistance value.It follows that the branch quiescent current is directly related with two PN junction voltages, to semiconductor technology, environment temperature Sensitive compared with supply voltage, branch current is unstable, influences reliability of the single ended input across resistance amplifying circuit, moreover, increasing The requirement of system power supply module, to increase the complexity of system.

It is illustrated in figure 3 the electrical block diagram across resistance amplifying circuit of one embodiment of this exposure.Fig. 3's amplifies across resistance Circuit includes amplifying circuit and negative-feedback circuit.

Amplifying circuit includes input, output end V_OUT, the first transistor M₁, second transistor M₂, first resistor device R_F、 Second resistor R_L, DC source I_DC1.According to one embodiment of this exposure, the first transistor M₁With second transistor M₂All have source Pole, drain and gate, wherein the first transistor M₁Grid can be used as this across resistance amplifying circuit input terminal and the first crystal Pipe M₁Drain electrode can be used as this across resistance amplifying circuit output end V_OUT, wherein photoelectric induction device PD can be photodiode, But not limited to this.The first transistor M₁Grid be configured to receive the input current provided by photoelectric induction device PD i_IN1.First resistor device R_FBe connected to the first transistor M₁Grid and second transistor M₂Source electrode between.The first transistor M₁Source electrode connect with ground terminal GND, the first transistor M₁Drain electrode connect second resistor R_LOne end, second resistor R_L The other end and feeder ear V_DD2Electrical connection.Second transistor M₂Grid and the first transistor M₁Drain electrode connection, the second crystal Pipe M₂Drain electrode and feeder ear V_DD2Connection.DC source I_DC1It is connected to second transistor M₂Source electrode and ground terminal GND between.

Negative-feedback circuit includes third transistor M₃And amplifier OP₁.According to one embodiment of this exposure, amplifier OP₁It can For operational amplifier (Operation Amplifier, OPAmp).Amplifier OP₁Including first input end (such as Fig. 3 acceptance of the bid Show the endpoint of "-"), the second input terminal endpoint of "+" (in such as Fig. 3 indicate) and output end, first input end and amplifying circuit Output end V_OUTConnection, the second input terminal and reference voltage V_REFConnection.Third transistor M₃With source electrode, drain and gate, Wherein third transistor M₃Grid and amplifier OP₁Output end connection, third transistor M₃Source electrode connect ground terminal GND, And third transistor M₃Drain electrode and second transistor M₂Source electrode, DC source I_DC1With second resistor R_FConnection.According to originally taking off Reveal an embodiment, the first transistor M₁With second transistor M₃For working in magnifying state, second transistor M₂For as source Pole follower.

The first transistor M₁Grid as this across resistance amplifying circuit input terminal, for receiving input current i_IN1.It should be across The amplifying circuit for hindering amplifying circuit is receiving input current i_IN1Output voltage after generating Linear Amplifer afterwards passes through output end V_OUT Output.As the input current i of trans-impedance amplifier_IN1When increase, pass through first resistor device R_FElectric current increase, thus make first electricity Hinder device R_FThe voltage at both ends increases, the first transistor M₁Drain electrode and second resistor R_LThe electric current I of place branch road_DC2Become larger, Second resistor R_LThe voltage difference at both ends increases.Due to output end V_OUTOutput voltage be feeder ear V_DD2Cut second resistor R_LThe voltage difference at both ends, therefore work as second resistor R_LWhen the voltage difference at both ends increases, amplification circuit output end V_OUTOutput voltage Reduce, linearity performance is caused to decline.Due to amplifier OP₁Presence, pass through setting reference voltage V_REFAnd by reference voltage V_REFWith output end V_OUTVoltage difference amplify, output end V_OUTVoltage decline will lead to the voltage difference and become larger, to amplify Device OP₁The amplified voltage of output end will increase, and can make third transistor M in this way₃Grid and source electrode between voltage increase Greatly, so that the voltage of node 1 be made to decline, that is, make first resistor device R_FThe voltage at both ends declines, to compensate counteracting first crystal Pipe M₁Grid voltage increase, to realize negative-feedback.Therefore, compared to such as Fig. 1 and Fig. 2 across resistance amplifying circuit, Fig. 3's Across resistance amplifying circuit negative-feedback circuit can in the case where input current increases, improve this across resistance amplifying circuit it is linear Degree, increases linear input range, vice versa.In other words, the negative-feedback circuit of Fig. 3 can be connect with amplifying circuit, and be matched It is set to as input current i_IN1When change, according to output end V_OUTOutput voltage and reference voltage V_REFDifference adjustment input terminal Voltage.

In addition, the negative-feedback circuit stablizes output end V_OUTQuiescent voltage, make output end V_OUTStatic voltage stability exist Reference voltage V_REF, to make to flow through second resistor R_LThe quiescent current I of place branch_DC2For (vdd2-vref)/rl, wherein Vdd2 is the first feeder ear V_DD2Voltage value, vref be reference voltage V_REFVoltage value, rl be second resistor R_LResistance Value.Compared to such as Fig. 2 across resistance amplifying circuit, Fig. 3's can significantly reduce the branch static circuit pair across resistance amplifying circuit The sensitivity of semiconductor technology, power supply and environmental problem keeps the branch quiescent current reliable and stable.

In addition, the second feeder ear V across resistance amplifying circuit of Fig. 1_DD2The minimum voltage value that must satisfy is V_GS1+V_GS2+ V_DS, wherein V_GS1For the first transistor M₁Grid and source electrode between voltage value, V_GS2For second transistor M₂Grid and source Voltage value and V between pole_DSFor the second DC source I_DC2The voltage difference at both ends.And the feeder ear V across resistance amplifying circuit of Fig. 3_DD2 The minimum voltage value that must satisfy is only vds3+vgs2+idc2*rl, wherein vds3 is third transistor M₃Drain electrode and source electrode Between voltage value, vgs2 be second transistor M₂Grid and source electrode between voltage value, idc2 be quiescent current I_DC2Electricity Flow valuve.Therefore, compared to Fig. 1 across resistance amplifying circuit, Fig. 3's has lower power consumption across resistance amplifying circuit.

It is illustrated in figure 4 the electrical block diagram across resistance amplifying circuit of one embodiment of this exposure.The present embodiment across It is similar across amplifying circuit is hindered with Fig. 3 to hinder amplifying circuit, wherein one the difference is that: the amplifying circuit of Fig. 4 further include: the Four transistor M₄Comprising source electrode, drain and gate, the 4th transistor M₄Source electrode and the first transistor M₁Drain electrode connection, the Four transistor M₄Drain electrode and second resistor R_LFirst terminal connection, the 4th transistor M₄Grid and biased electrical pressure side V_BIA It connects and is used to receive bias voltage.

Wherein biased electrical pressure side V_BIAIt can connect external bias circuit, and the first transistor M₁With the 4th transistor M₄It constitutes Vertical cascade (Cascode) enlarged structure, wherein Cascode enlarged structure is cascode structure.By the way that the 4th crystal is arranged Pipe M₄To reduce the first transistor M₁Drain electrode impedance, further increase across resistance amplifying circuit the linearity.

It is illustrated in figure 5 the electrical block diagram across resistance amplifying circuit of one embodiment of this exposure.The present embodiment across It is similar across amplifying circuit is hindered with Fig. 4 to hinder amplifying circuit, wherein one the difference is that: amplifying circuit further include: second puts Big device OP₂, the second amplifier OP₂Input terminal and the 4th transistor M₄Source electrode connection, the second amplifier OP₂Input terminal with 4th transistor M₄Grid connection.

Wherein, the second amplifier OP₂With the 4th transistor M₄Constitute negative feedback loop, and the first transistor M₁, the 4th crystal Pipe M₄With the second amplifier OP₂Regulated Cascode enlarged structure is constituted, wherein Regulated Cascode amplification knot Structure is adjustable type cascode structure.The first transistor M can be further decreased in this way₁Drain electrode impedance, and decay first Transistor M₁Drain electrode unfavorable ripple voltage, further increase across resistance amplifying circuit the linearity.

It is illustrated in figure 6 the electrical block diagram across resistance amplifying circuit of one embodiment of this exposure.The present embodiment across Hinder that amplifying circuit is similar across resistance amplifying circuit with Fig. 3, wherein one the difference is that: Fig. 6 across hindering the of amplifying circuit Three transistor M₃Drain electrode and amplifying circuit input terminal connect.The wherein input terminal of amplifying circuit, that is, the first transistor M₁Grid Pole.

The feedback principle across resistance amplifying circuit of the embodiment is similar in Fig. 3, in this embodiment, works as input current When increase, the increase of the voltage of the input terminal of compensation counteracting amplifying circuit is directly adjusted by feed circuit, to realize negative anti- Feedback is adjusted.To improve the linear input range across resistance amplifying circuit.

It should be noted that the difference in Fig. 4 and Fig. 5 with respect to Fig. 3, can also increase in the technical solution of Fig. 6 To form corresponding technical solution.

In one embodiment of this exposure, CMOS technology, BiCMOS technique or bipolar technology shape are used across resistance amplifying circuit At but not limited to this.It should may be implemented in single integrated device across resistance amplifying circuit, discrete component can also be used It realizes, specific implementation can be selected according to the actual situation.

In conclusion some embodiments of this exposure, which at least have the effect that, improves linear input range and linear Degree, makes branch possess stable quiescent current, increases the stability and reliability of circuit, and the feelings in consumption same current Under condition, the supply voltage of normal work reduces a threshold voltage (or a PN junction voltage) or more, that is, reduces circuit function Consumption, in addition, circuit realizes that condition is simple.

One embodiment of this exposure additionally provides a kind of communication device, with transmission device and reception device, reception dress Set the trans-impedance amplifier including above-mentioned Fig. 1 to Fig. 6.

In some embodiments of this exposure, which can be photoreceiver, and but not limited to this.For example, should It can be used as the front end of frequency mixer across resistance amplifying circuit.

" one embodiment of this exposure " or the reference of similar terms are meant together with other embodiments throughout this manual The a particular feature, structure, or characteristic being described together is contained at least one embodiment and can be not necessarily in currently all embodiment In.Therefore, phrase " one embodiment of this exposure " or similar terms throughout this manual everywhere in be accordingly not necessarily referring to The same embodiment.Furthermore, it is possible to which any suitable mode combines a particular feature, structure, or characteristic of any specific embodiment With one or more other embodiments.It should be understood that other variations and the modification mirror of described herein and diagram illustrating embodiment Teaching in this article is the part of spirit and scope that is possible and will being considered as this exposure.

The technology contents and technical characterstic of this exposure have revealed that as above, however those skilled in the art still may base In this exposure teaching and announcement and make various replacements and modification without departing substantially from this exposure spirit.Therefore, the protection model of this exposure The revealed content of embodiment should be not limited to by enclosing, and should include various replacements and modification without departing substantially from this exposure, and be this patent Application claims are covered.

Claims (12)

1. a kind of across resistance amplifying circuit, comprising:

Amplifying circuit, with input terminal and output end, the amplifying circuit is configured as obtaining by the input terminal and input Electric current, and output voltage is generated in the output end；And

Negative-feedback circuit is connect with the amplifying circuit, and is configured as when the input current changes, according to described defeated The difference of voltage and reference voltage adjusts the voltage of the input terminal out.

2. it is according to claim 1 across resistance amplifying circuit, wherein the negative-feedback circuit is configured as when the input electricity When stream increases, reduce the voltage of the input terminal according to the difference of the output voltage and reference voltage.

3. it is according to claim 1 across resistance amplifying circuit, wherein the amplifying circuit includes:

The first transistor, with source electrode, drain and gate, wherein the grid of the first transistor and the input terminal connect It connects, the source electrode of the first transistor is connect with ground terminal；

Second transistor, with source electrode, drain and gate, wherein the grid of the second transistor and the output end connect It connects；

First resistor device is connected between the input terminal and the source electrode of the second transistor；

Second resistor, the first terminal of the second resistor are connect with the grid of the second transistor, second electricity The Second terminal of device is hindered for connecting the first feeder ear；

DC source, the first terminal of the DC source are connect with the source electrode of the second transistor, the second end of the DC source It is sub to be connect with the ground terminal.

4. it is according to claim 3 across resistance amplifying circuit, wherein the negative-feedback circuit includes:

First amplifier comprising first input end, the second input terminal and output end, the first input end and amplification electricity The output end on road connects, and second input terminal is connect with the reference voltage；

Third transistor, with source electrode, drain and gate, wherein the grid of the third transistor and first amplifier Output end connection, the source electrode of the third transistor connects the ground terminal.

5. it is according to claim 4 across resistance amplifying circuit, wherein the drain electrode of the third transistor and second crystal The source electrode of pipe connects.

6. it is according to claim 5 across resistance amplifying circuit, wherein the drain electrode of the first transistor and the second resistance The first terminal of device connects.

7. it is according to claim 5 across resistance amplifying circuit, wherein the amplifying circuit further include:

4th transistor comprising source electrode, drain and gate, the leakage of the source electrode and the first transistor of the 4th transistor Pole connection, the drain electrode of the 4th transistor are connect with the first terminal of the second resistor, the grid of the 4th transistor Pole and biased electrical press bond simultaneously are used to receive bias voltage.

8. according to claim 7 across resistance amplifying circuit, wherein the amplifying circuit further include:

The input terminal of second amplifier, second amplifier is connect with the source electrode of the 4th transistor, second amplifier Input terminal is connect with the grid of the 4th transistor.

9. it is according to claim 4 across resistance amplifying circuit, wherein the drain electrode of the third transistor and the amplifying circuit The input terminal connection.

10. it is according to claim 1 to 9 across resistance amplifying circuit, wherein described across resistance amplifying circuit further include:

Photoelectric induction device, is connected to the input terminal of the amplifying circuit, and is configured to provide the input current.

11. -9 is described in any item across resistance amplifying circuit according to claim 1, wherein described to use CMOS across resistance amplifying circuit Technique, BiCMOS technique or bipolar technology are formed.

12. a kind of communication device, with reception device, the reception device includes as claim 1-11 is described in any item Across resistance amplifying circuit.