CN207652427U - Multifrequency receiver radio frequency front-end device - Google Patents
Multifrequency receiver radio frequency front-end device Download PDFInfo
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- CN207652427U CN207652427U CN201721853147.0U CN201721853147U CN207652427U CN 207652427 U CN207652427 U CN 207652427U CN 201721853147 U CN201721853147 U CN 201721853147U CN 207652427 U CN207652427 U CN 207652427U
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Abstract
The utility model discloses a kind of multifrequency receiver radio frequency front-end device, which includes signal receiving end, multiband filter, signal detection module, clipping module, signal amplification module, disconnecting switch module and signal output end；The input terminal of multiband filter is connect with signal receiving end, and the output end of multiband filter and the input terminal of signal detection module connect；First output end of signal detection module and the input terminal of clipping module connect, and the second output terminal of signal detection module is connect with the first input end of disconnecting switch module；The output end of clipping module is connect with the input terminal of signal amplification module；The output end of signal amplification module is connect with the second input terminal of disconnecting switch module；The output end of disconnecting switch module is connect with signal output end.The radiofrequency signal of different-waveband can be carried out at the same time processing by the utility model, and effectively be protected to multifrequency receiver radio frequency front-end device.
Description
Technical field
The utility model is related to radar component and signal communication field, more particularly to a kind of multifrequency receiver radio-frequency front-end dress
It sets.
Background technology
Multifrequency receiver radio frequency front-end device is the important component of communication system, in the prior art, multifrequency receiver
Radio frequency front-end device is mainly made of low-noise amplifier, limiter, filter, before existing a variety of multifrequency receiver radio frequencies
End device after operation principle is the wave band for selecting some range, then is filtered signal, amplitude limit and amplification, finally selects
Select a wave band output either directly output.In this process, the service band model of multifrequency receiver radio frequency front-end device
Enclose to select as needed, and still, multifrequency receiver radio frequency front-end device can only once handle a wave band so that multifrequency connects
It is single that receipts machine radio frequency front-end device handles signal.Meanwhile when handling its all band, the switching for being filtered device, limiter is needed,
Processing speed is slower.Moreover, the range of signal of required processing is excessive, once more than the tolerance range of component, will damage whole
A multifrequency receiver radio frequency front-end device.
Utility model content
The main purpose of the utility model is to propose a kind of multifrequency receiver radio frequency front-end device, it is intended to solve multifrequency reception
The machine radio frequency front-end device wave band processing problem that signal is single, processing speed is slower, and in this process, to multifrequency receiver
Radio frequency front-end device carries out protection.
To achieve the above object, the utility model proposes a kind of multifrequency receiver radio frequency front-end device, the multifrequency receives
Machine radio frequency front-end device include signal receiving end, multiband filter, signal detection module, clipping module, signal amplification module, every
From switch module and signal output end；The signal detection module includes input terminal, the first output end and second output terminal；It is described
Disconnecting switch module includes first input end, the second input terminal and output end；The input terminal of the multiband filter and the letter
The connection of number receiving terminal, the output end of the multiband filter are connect with the input terminal of the signal detection module, and the signal is examined
The first output end for surveying module is connect with the input terminal of the clipping module, the second output terminal of the signal detection module and institute
State the first input end connection of disconnecting switch module；The input terminal of the output end of the clipping module and the signal amplification module
Connection；The output end of the signal amplification module is connect with the second input terminal of the disconnecting switch module；The disconnecting switch
The output end of module is connect with the signal output end；Wherein, the multiband filter filters different-waveband with multiple
The radiofrequency signal of the resonance filter chamber of wave, multiple and different wave bands for being received to the signal receiving end is carried out at the same time at filtering
Reason；The signal detection module is detected for the intensity to the radiofrequency signal after being filtered, and by testing result
It is sent to signal isolation module；The clipping module, for carrying out amplitude limiting processing to the radiofrequency signal after being filtered；Institute
Signal amplification module is stated, for being amplified processing to the radiofrequency signal after amplitude limiting processing；The disconnecting switch module is used
When the intensity in the radiofrequency signal is more than rotection thresholds, turned off, to cut off the output of the signal amplification module.
Preferably, the signal detection module includes coupler and detecting circuit, and the coupler includes signal input part
Mouth, signal output port, coupled output ports and isolated port；The signal input port of the coupler is filtered with the multifrequency
The output end of device connects；The signal output port of the coupler is connect with the input terminal of the clipping module；The coupler
Coupled output ports connect with the input terminal of the detecting circuit；The output end of the detecting circuit and the disconnecting switch mould
The first input port of block connects；The coupler, in the radiofrequency signal after being filtered from the multiband filter points
Separate out detection signal；The detecting circuit, the detection signal for being isolated to the coupler are detected, and export one
Testing result signal.
Preferably, the detecting circuit include input terminal, the first capacitance, the second capacitance, third capacitance, the 4th capacitance,
5th capacitance, the 6th capacitance, the 7th capacitance, the 8th capacitance, first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th
Resistance, the first detection chip and enable signal input terminal；
First detection chip includes supply pin, positive input foot, empty pin, negative input foot, grounding leg, output pin, the
One resistance foot, second resistance foot, enabled foot and filtering foot；The input terminal has input terminal and ground terminal, the input terminal
The input terminal of son is the input terminal of the detecting circuit, the ground terminal ground connection of the input terminal；The first of first capacitance
The input terminal interconnection at end, the first end of second capacitance and the input terminal, the second end ground connection of first capacitance；Institute
State the second capacitance second end, the first end of the first resistor and the first detection chip positive input foot interconnection；Described first
The second end of resistance, the first end of the third capacitance, the first end of the 4th capacitance and first detection chip it is negative
Input pin interconnects；The second end of the third capacitance and the second end of the 4th capacitance are grounded；
The first end of the second resistance is connect with power supply, the second end of the second resistance, the 5th capacitance
First end, the first end of the 6th capacitance, the first end and first detection chip of the 7th capacitance supply pin
Interconnection, the second end of the 5th capacitance are connect with the filtering foot of first detection chip；The second end of 6th capacitance
It is grounded with the second end of the 7th capacitance；The first end of the 3rd resistor and the first resistor foot of first detection chip connect
It connects, the second end ground connection of the 3rd resistor；The second resistance of the first end and first detection chip of 4th resistance
Foot connects, the second end ground connection of the 4th resistance；The first end of 5th resistance, the enabled foot of first detection chip
It is interconnected with the enable signal input terminal, the second end ground connection of the 5th resistance；The first end of 8th capacitance with it is described
The output pin of first detection chip connects, the second end ground connection of the 8th capacitance；The output pin of first detection chip is
The output port of the detecting circuit.
Preferably, the clipping module include the first diode and the second diode, first diode just extremely
The output end of the clipping module, the cathode of first diode are connect with the anode of second diode；Described second
The plus earth of diode, the cathode of second diode are connect with the anode of first diode, and the described 2nd 2
The cathode of pole pipe is the output end of the clipping module.
Preferably, the disconnecting switch module includes electronic switch and control circuit, and the electronic switch includes first defeated
Enter end, the second input terminal and output end, the first input end of the electronic switch and the output end of the signal amplification module connect
It connects, the second input terminal of the electronic switch is connect with the output end of the control circuit；The input terminal of the control circuit with
The output end of the detecting circuit connects；
The control circuit is used to receive the testing result signal of the detecting circuit, and by the testing result signal pair
The voltage value answered is compared with voltage protection threshold value, is more than or equal to the electricity in the corresponding voltage value of testing result signal
When pressing rotection thresholds, output switch control signal, control electronic switch disconnects.
Preferably, the control circuit includes the first signal input part, first control signal output end, second control signal
Output end, the 6th resistance, the 7th resistance, the 8th resistance, the first amplifier, the second amplifier, the first end of the 6th resistance
Connect power supply, the second end of the 6th resistance, the first end and first amplifier of the 7th resistance anode
Input terminal interconnects；The anode of the second end of 7th resistance, the first end of the 8th resistance and second amplifier is defeated
Enter end interconnection；The second end of 8th resistance is grounded；The negative input of first amplifier and second amplifier
Negative input connection and for the control circuit the first signal input part, the output end of first amplifier is described
The first control signal output end of control circuit；The output end of second amplifier is the second control letter of the control circuit
Number output end.
Preferably, the electronic switch includes the 9th capacitance, the tenth capacitance, the 11st capacitance, the 12nd capacitance, the 13rd
Capacitance, the 14th capacitance, the 15th capacitance, the 16th capacitance, the 17th capacitance, the 18th capacitance, the first inductance, the second electricity
Sense, third inductance, the 4th inductance, the 5th inductance, the 9th resistance, the tenth resistance, eleventh resistor, third diode, the four or two
Pole pipe, the 5th diode and the 6th diode；The first end of 9th capacitance connects with the output end of the signal amplification module
Connect, the second end of the 9th capacitance, positive, described 4th diode of the third diode it is positive and described first electricity
The first end of sense interconnects；The first end of tenth capacitance be the electronic switch output end, the second of the tenth capacitance
End, the cathode of the third diode, the 5th diode positive and described second inductance first end interconnection；Described
The first end of the first end of 11 capacitances, the cathode of the 5th diode and the 4th inductance interconnects, the 11st electricity
The second end of appearance is grounded；The first end of 12nd capacitance is grounded, the second end of the 12nd capacitance, the third inductance
First end, the 4th diode cathode and the 6th diode anode interconnection；The first end of 13rd capacitance, institute
State the first end interconnection of the cathode and the 5th inductance of the 6th diode, the second end ground connection of the 13rd capacitance；It is described
The first end of the second end of first inductance, the first end of the 14th capacitance and the 9th resistance interconnects；9th electricity
The second end of resistance connects power supply；The second end of 14th capacitance is grounded；The second end of second inductance, described
The first end of 15 capacitances and the interconnection of the first control output end of the control circuit；The second end of 15th capacitance is grounded；
The second end of the third inductance, the first end of the 16th capacitance and the interconnection of the second control output end of the control circuit；
The second end of 16th capacitance is grounded；The second end of 4th inductance, the first end of the tenth resistance and described
The first end of 17 capacitances interconnects；The second end of tenth resistance is grounded；The second end of 17th capacitance is grounded；It is described
The first end of the second end of 5th inductance, the first end of the eleventh resistor and the 18th capacitance interconnects；Described tenth
The second end of one resistance is grounded；The second end of 18th capacitance is grounded.
The utility model, can be efficient by the way that multiband filter, detection module and disconnecting switch module are arranged in circuit
Ground is carried out at the same time processing to the signal of different-waveband, achievees the purpose that multiple signals while handling, while can improve multifrequency reception
The processing speed of machine radio frequency front-end device.The utility model also utilizes the shunting function of coupler, by detecting circuit to separation
The signal gone out carries out intensity detection, and when intensity is more than circuit tolerance range, control circuit controls electronic switch and disconnects, realization pair
Multifrequency receiver radio frequency front-end device effective protection, moreover, the structure realized is simple.
Description of the drawings
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, the structure that can also be shown according to these attached drawings obtains other attached drawings.
Fig. 1 is the high-level schematic functional block diagram of the utility model multifrequency receiver radio frequency front-end device；
Fig. 2 is the electrical block diagram of the utility model multifrequency receiver radio frequency front-end device；
Fig. 3 is the electrical block diagram of detecting circuit in the utility model multifrequency receiver radio frequency front-end device；
Fig. 4 is the electrical block diagram of clipping module in the utility model multifrequency receiver radio frequency front-end device；
Fig. 5 is the electrical block diagram of control circuit in the utility model multifrequency receiver radio frequency front-end device；
Fig. 6 is the electrical block diagram of electronic switch in the utility model multifrequency receiver radio frequency front-end device.
The embodiments will be further described with reference to the accompanying drawings for the realization, functional characteristics and advantage of the utility model aim.
Specific implementation mode
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describing, it is clear that described embodiment is only a part of the embodiment of the utility model, rather than all
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Lower obtained every other embodiment, shall fall within the protection scope of the present invention.
If it is to be appreciated that related in the utility model embodiment directionality instruction (such as upper and lower, left and right, it is preceding,
Afterwards ...), then directionality instruction be only used for explain it is opposite between each component under a certain particular pose (as shown in the picture)
Position relationship, motion conditions etc., if the particular pose changes, directionality instruction also correspondingly changes correspondingly.
If, should " first ", " the in addition, relate to the description of " first ", " second " etc. in the utility model embodiment
Two " etc. description is used for description purposes only, and is not understood to indicate or imply its relative importance or is implicitly indicated meaning
The quantity of the technical characteristic shown." first " is defined as a result, the feature of " second " can explicitly or implicitly include at least one
A this feature.In addition, the technical solution between each embodiment can be combined with each other, but must be with ordinary skill
Personnel can be implemented as basis, will be understood that this technical side when the combination of technical solution appearance is conflicting or cannot achieve
The combination of case is not present, also not within the protection domain of the requires of the utility model.
The utility model proposes a kind of multifrequency receiver radio frequency front-end devices, are suitable for radar and the communications field, can solve
The wave band processing of receiving radio frequency front end is single, the problems such as being easily damaged.
Referring to Fig.1,2, in one embodiment of the utility model, multifrequency receiver radio frequency front-end device includes signal receiving end
RFI, multiband filter 27, signal detection module 28, clipping module 29, signal amplification module 30, disconnecting switch module 31 and letter
Number output end RFO, the signal detection module 28 includes input terminal, the first output end and second output terminal；The disconnecting switch
Module 31 includes first input end, the second input terminal and output end.
Specifically, the input terminal of the multiband filter 27 and the signal receiving end RFIConnection, the multiband filter
27 output end is connect with the input terminal of the signal detection module 28；First output end of the signal detection module 28 and institute
State the input terminal connection of clipping module 29, the second output terminal of the signal detection module 28 and the disconnecting switch module 31
First input end connection；The output end of the clipping module 29 is connect with the input terminal of the signal amplification module 30；It is described
The output end of signal amplification module 30 is connect with the second input terminal of the disconnecting switch module 31；The disconnecting switch module 31
Output end and the signal output end RFOConnection；The multiband filter 27 has and multiple is filtered to different-waveband
Resonance filter chamber, for the signal receiving end RFIThe radiofrequency signal of the multiple and different wave bands received is carried out at the same time at filtering
Reason；The signal detection module 28 is detected for the intensity to the radiofrequency signal after being filtered, and detection is tied
Fruit is sent to disconnecting switch module 31；The clipping module 29, for carrying out amplitude limit to the radiofrequency signal after being filtered
Processing；The signal amplification module 30, for being amplified processing to the radiofrequency signal after amplitude limiting processing；It is described to keep apart
Module 31 is closed, for when the intensity of the radiofrequency signal is more than rotection thresholds, being turned off, amplifies mould to cut off the signal
The output of block.
Pass through setting signal receiving terminal RFI, multiband filter 27, signal detection module 28, clipping module 29, signal put
Big module 30, disconnecting switch module 31 and signal output end RFO；The multiband filter 27 can be to signal receiving end RFIIt receives
To the radiofrequency signals of multiple wave bands be carried out at the same time and be filtered, and between the radiofrequency signal of multiple wave bands independently of each other, filter
Radiofrequency signal after wave processing is output to signal detection module 28, and signal detection module 28 carries out intensity to these radiofrequency signals
It detects and testing result signal is sent to disconnecting switch module 31, when testing result signal is more than signal strength threshold, every
From switch module 31 disconnect, cut off the signal amplification module 30 radiofrequency signal output, to solve signal processing it is single,
Speed is excessively slow and solves the problems, such as that signal excessively causes signal strength more than circuit tolerance range.
Optionally, as shown in figure 3, the signal detection module 28 includes coupler 12 and detecting circuit 11, the coupling
Device 12 includes signal input port, signal output port, coupled output ports and isolated port；The signal of the coupler 12 is defeated
Inbound port is connect with the output end of the multiband filter 27；The signal output port of the coupler 12 and the clipping module
29 input terminal connection；The coupled output ports of the coupler 12 are connect with the input terminal of the detecting circuit 11；The coupling
It is not exported under the isolated port normal condition of clutch 12；The output end of the detecting circuit 11 and the disconnecting switch module
31 first input port connection.
Main radiofrequency signal is isolated into part signal by setting coupler 12 and is conveyed to the detecting circuit 11, it is described
Whether detecting circuit 11 is detected the portion radio frequency signal strength that coupler 12 is isolated, to determine signal strength in electricity
Road tolerance range, then detecting circuit 11 export a testing result signal according to testing result.
Wherein, the coupler 12 is preferably microstrip line directional coupler, and above-mentioned coupler 12 is not limited to a certain spy
Determine coupler, other can realize that the coupler type of this programme should all be included.
Optionally, the detecting circuit 28 include input terminal J1, the first capacitance C1, the second capacitance C2, third capacitance C3,
4th capacitance C4, the 5th capacitance C5, the 6th capacitance C6, the 7th capacitance C9, the 8th capacitance C8, first resistor R1, second resistance R2,
3rd resistor R3, the 4th resistance R4, the 5th resistance R5 and the first detection chip and enable signal input terminal EN；First detection
Chip includes supply pin 1, positive input foot 2, empty pin 3, negative input foot 4, grounding leg 5, output pin 6, first resistor foot 7, the
Two resistance feet 8, enabled foot 9 and filtering foot 19；The input terminal J1 has input terminal and ground terminal, the input terminal J1's
Input terminal is the input terminal of the detecting circuit 28, the ground terminal ground connection of the input terminal；The first of the first capacitance C1
The input terminal interconnection at end, the first end of the second capacitance C2 and the input terminal, the second termination of the first capacitance C1
Ground；The second end of the second capacitance C2, the first end of the first resistor R1 and the first detection chip positive input foot 2
Interconnection；The second end of the first resistor R1, the first end of the third capacitance C3, the first end of the 4th capacitance C4 and
The negative input foot 4 of first detection chip interconnects, the second end of the third capacitance C3 and the second of the 4th capacitance C4
End is grounded；The first end of the second resistance R2 is connect with power supply V1, the second end of the second resistance R2, described
The first end of five capacitance C5, the first end of the 6th capacitance C6, the first end of the 7th capacitance C7 and first detection
The supply pin 1 of chip interconnects；The second end of the 5th capacitance C5 is connect with the filtering foot 10 of first detection chip；Institute
The second end of the second end and the 7th capacitance C7 of stating the 6th capacitance C6 is grounded；The first end of the 3rd resistor R3 and described the
The first resistor foot 7 of one detection chip connects, the second end ground connection of the 3rd resistor R3；The first of the 4th resistance R4
End is connect with the second resistance foot 8 of first detection chip, the second end ground connection of the 4th resistance R4；5th resistance
The first end of R5, the enabled foot of first detection chip and enable signal input terminal interconnection, the 5th resistance R5's
Second end is grounded；The enabled foot 9 of first detection chip is chip drives port；The first end of the 8th capacitance C8 with
The output pin 6 of first detection chip connects, the second end ground connection of the 8th capacitance C8；First detection chip it is defeated
Go out the output port J2 that foot 6 is the detecting circuit 28.
Optionally, as shown in figure 4, the clipping module 29 includes the first diode D1 and the second diode D2, described the
The just extremely output end RF of the clipping module 29 of one diode D1IN, the cathode and described second of the first diode D1
The anode connection of diode D2；The plus earth of the second diode D2, the cathode of the second diode D2 and described the
The anode connection of one diode D1, and the cathode of the second diode D2 is also the output end RF of the clipping module 29OUT。
Optionally, as shown in Figure 5,6, the disconnecting switch module 31 includes electronic switch 14 and control circuit 13, described
Electronic switch 14 include first input end, the second input terminal and output end, the first input end of the electronic switch 14 with it is described
The output end of signal amplification module 30 connects, the output of the second input terminal and the control circuit 13 of the electronic switch 14
End connection；The input terminal of the control circuit 13 is connect with the output end of the detecting circuit 11.
Wherein, the control circuit 13 receives the testing result signal of detecting circuit 11, and according to detecting circuit 11
Testing result signal is accordingly compared, when testing result signal exceeds setting signal intensity threshold, output DC control letter
Number, so as to control the disconnection of electronic switch 14, realize the protection of circuit.
Optionally, the control circuit 13 includes the first signal input part Vin, first control signal output end vo ut1, the
Two control signal output Vout2, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the amplifications of the first amplifier N1 and second
The first end of device N2, the 6th resistance R6 connect power supply V2, the second end of the 6th resistance R6, the 7th resistance
The electrode input end of the first end of R7 and the first amplifier N1 interconnect；The second end of the 7th resistance R7, the described 8th
The electrode input end of the first end of resistance R8 and the second amplifier N2 interconnect；The second end of the 8th resistance R8 is grounded；
The negative input of the first amplifier N1 connect with the negative input of the second amplifier N2 and is control electricity
The output end of first the signal input part Vin, the first amplifier N1 on road 13 is the first control letter of the control circuit 13
Number output end vo ut1；The output end of the second amplifier N2 is the second control signal output end of the control circuit 13
Vout2。
It should be noted that the embodiment of above-mentioned control circuit 13 is only the preferred embodiment of the utility model, it is any to realize
The available circuit connection type of this technology effect should be included in interior.
Optionally, the electronic switch 14 includes the 9th capacitance C9, the tenth capacitance C10, the 11st capacitance C11, the 12nd
Capacitance C12, the 13rd capacitance C13, the 14th capacitance C14, the 15th capacitance C15, the 16th capacitance C16, the 17th capacitance
C17, the 18th capacitance C18, the first inductance L1, the second inductance L2, third inductance L3, the 4th inductance L4, the 5th inductance L5, the 9th
Resistance R9, the tenth resistance R10, eleventh resistor R11, third diode D3, the 4th diode D4, the 5th diode D5 and
Six diode D6；The first end of the 9th capacitance C9 is connect with the output end of the signal amplification module 30, the 9th electricity
Hold the second end of C9, the third diode D3 positive, described 4th diode D4 positive and described first inductance L1
First end interconnects；The first end of the tenth capacitance C10 is the output end of the electronic switch 14, the tenth capacitance C10's
Second end, the cathode of the third diode D3, the 5th diode D5 positive and described second inductance L2 first end
Interconnection；The first of the first end of the 11st capacitance C11, the cathode of the 5th diode D5 and the 4th inductance L4
End interconnection, the second end ground connection of the 11st capacitance C11；The first end of the 12nd capacitance C12 is RF3, normal condition
Lower ground connection, the second end of the 12nd capacitance C12, the first end of the third inductance L3, the 4th diode D4 cathode and
The anode interconnection of the 6th diode D6；The first end of the 13rd capacitance C13, the cathode of the 6th diode D6 and
The 5th inductance L5 first ends interconnection, the second end ground connection of the 13rd capacitance C13；The second of the first inductance L1
The first end interconnection at end, the first end of the 14th capacitance C14 and the 9th resistance R9；The second of the 9th resistance R9
Hold V6 connection power supplies；The other end of the 14th capacitance C14 is grounded；The second end of the second inductance L2, described
The first end V4 and the first control output end of control circuit Vout1 of 15 capacitance C15 is interconnected；The 15th capacitance C15
Second end ground connection；The second end of the third inductance L3, the first end of the 16th capacitance C16 and the control circuit
Two control output end Vout2 are interconnected；The second end of the 16th capacitance C16 is grounded；The second end of the 4th inductance L4,
The first end of the tenth resistance R10 and the first end interconnection of the 17th capacitance C1；The second end of the tenth resistance R10
B1 is grounded；The second end of the 17th capacitance C17 is grounded；The second end of the 5th inductance L5, the eleventh resistor R11
First end and the 18th capacitance C18 first end interconnection；The second end B2 ground connection of the eleventh resistor R11；It is described
The second end of 18th capacitance C18 is grounded.
By the way that third diode D3, the 4th diode D4, the 5th diode D5 and the six or two are arranged in the electronic switch
Pole pipe D6, the third diode D3, the 4th diode D4, the 5th diode D5 and the 6th diode D6 are in control circuit 13
DC control signal under the action of, the approximate impedance operator being switched on or off is presented, the transmission channel of signal can be controlled, from
And the closure of electronic switch can be controlled, i.e., when electronic switch 14 is under normally state, 14 main radio frequency of electronic switch is believed
Number input terminal RFC is connected to main RF signal output RF1, and multifrequency receiver radio frequency front-end device normally exports；Electronic switch
14 are off down, and 14 main RF signal input end RFC of electronic switch is connected to ground terminal RF3, main radiofrequency signal output
Hold RF1 without output, i.e. multifrequency receiver radio frequency front-end device disconnects, and realizes the effect of insulation blocking.
Based on above-mentioned all embodiments, below in conjunction with Fig. 1,2 pairs of multifrequency receiver radio frequency front-end devices circuit theory into
Row elaborates：
As shown in Figure 1, 2, it is received by signal receiving end when multiband filter 27 extraneous faint with multiple wave bands
When radiofrequency signal, these signals are separated into mutual independent multiple resonant cavities while being handled by multiband filter 27, and simultaneously
It is output in coupler 12, these signals are separated portion radio frequency signal and are output to detecting circuit 11 by coupler 12, flow through coupling
12 another part radiofrequency signal of device reaches the letter that can be exported by amplitude limit, the amplification of clipping module 29 and amplification module 30
Number intensity；Wherein, predetermined threshold value is signal strength, this preset signal strength threshold value can be adjusted greatly according to actual needs
It is small；After detecting circuit 11 receives the coupled output signal of directional coupler 12, these signals are subjected to signal strength detection, if
More than preset signal strength threshold value, detecting circuit 11 sends out testing result signal；Control circuit 13 receives testing result signal
Afterwards, control electronic switch 14 disconnects, and achievees the purpose that isolation protective circuit；Conversely, then keeping the conducting of electronic switch 14, flow through
The radiofrequency signal of clipping module 16 and amplification module 30 can be exported by electronic switch 14.
Wherein, testing result signal is a DC voltage amount, and specific mechanism is as follows：
(1) when signal strength is more than preset signal strength threshold value, the output end voltage of the detecting circuit 11 is 3.5V-5V
(high level)；First control output end Vout1 voltage values of the control circuit 13 are 3.5V-5V (high level), the control
Second control output end Vout2 voltage values of circuit 13 are 0V-0.7V (low level)；The 3rd 2 in the electronic switch 14
Pole pipe D3 cut-offs, the 5th diode D5 conductings, the 4th diode D4 conductings, the 6th diode D6 cut-offs, the control circuit
Ground terminal RF3 has output.
(2) when signal strength is less than preset signal strength threshold value, the output voltage of the detecting circuit 11 is 0V-0.7V
(low level)；First control output end Vout1 voltage values of the control circuit 13 are 0V-0.7V (low level), the control
Second control output end Vout2 voltage values of circuit 13 are 3.5V-5V (high level)；The 3rd 2 in the electronic switch 14
Pole pipe D3 cut-offs, the 5th diode D5 conductings, the 4th diode D4 cut-offs, the 6th diode D6 conductings, the control circuit 13
Main RF signal output export radiofrequency signal.
By the way that clipping module 29 and amplification module 30 are arranged in multifrequency receiver radio frequency front-end device, ensure that multifrequency receives
The basic function of machine radio frequency front-end device removes the radio frequency letter for realizing multiple and different wave bands then by the way that multiband filter 27 is arranged
Number simultaneously processing and mutually independent function, are made that improvements, and the device volume of realization function is than existing to the prior art
Multifrequency receiver radio frequency front-end device it is small, it is simple in structure.In addition, letter is arranged in multifrequency receiver radio frequency front-end device
Number detection module 28 and signal isolation module 31, in the case of the multiple radiofrequency signals that can be handled at the same time, to the radio frequency in circuit
Signal strength is detected, and is compared with preset signal strength threshold value, when beyond preset threshold range, signal isolation module hair
The effect of waving, control electronic switch disconnect, and to reach in the case of the radiofrequency signal of multiple wave bands while processing, protect circuit
Purpose.
The above is only the preferred embodiment of the present invention, and it does not limit the scope of the patent of the present invention,
It is every under the inventive concept of the utility model, equivalent structure made based on the specification and figures of the utility model becomes
It changes, or directly/be used in other related technical areas indirectly and be included in the scope of patent protection of the utility model.
Claims (7)
1. a kind of multifrequency receiver radio frequency front-end device, which is characterized in that the multifrequency receiver radio frequency front-end device includes letter
Number receiving terminal, multiband filter, signal detection module, clipping module, signal amplification module, disconnecting switch module and signal output
End；
The signal detection module includes input terminal, the first output end and second output terminal；The disconnecting switch module includes the
One input terminal, the second input terminal and output end；The input terminal of the multiband filter is connect with the signal receiving end, described more
The output end of frequency filter is connect with the input terminal of the signal detection module；First output end of the signal detection module with
The input terminal of the clipping module connects, the second output terminal of the signal detection module and the first of the disconnecting switch module
Input terminal connects；The output end of the clipping module is connect with the input terminal of the signal amplification module；The signal amplifies mould
The output end of block is connect with the second input terminal of the disconnecting switch module；The output end of the disconnecting switch module and the letter
The connection of number output end；
Wherein, the multiband filter has multiple resonance filter chambers being filtered to different-waveband, for being connect to the signal
The radiofrequency signal for multiple and different wave bands that receiving end receives, which is carried out at the same time, to be filtered；
The signal detection module is detected for the intensity to the radiofrequency signal after being filtered, and detection is tied
Fruit is sent to disconnecting switch module；
The clipping module, for carrying out amplitude limiting processing to the radiofrequency signal after being filtered；
The signal amplification module, for being amplified processing to the radiofrequency signal after amplitude limiting processing；
The disconnecting switch module, for when the intensity of the radiofrequency signal is more than rotection thresholds, being turned off, to cut off
State the output of signal amplification module.
2. multifrequency receiver radio frequency front-end device as described in claim 1, which is characterized in that the signal detection module includes
Coupler and detecting circuit, the coupler include signal input port, signal output port, coupled output ports；The coupling
The signal input port of clutch is connect with the output end of the multiband filter；The signal output port of the coupler with it is described
The input terminal of clipping module connects；The coupled output ports of the coupler are connect with the input terminal of the detecting circuit；It is described
The output end of detecting circuit is connect with the first input port of the disconnecting switch module；
The coupler, for isolating detection signal in the radiofrequency signal after being filtered from the multiband filter；
The detecting circuit, the detection signal for being isolated to the coupler are detected, and export a testing result
Signal.
3. multifrequency receiver radio frequency front-end device as claimed in claim 2, which is characterized in that the detecting circuit includes input
Terminal, the first capacitance, the second capacitance, third capacitance, the 4th capacitance, the 5th capacitance, the 6th capacitance, the 7th capacitance, the 8th capacitance,
First resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the first detection chip and enable signal input terminal；
First detection chip includes supply pin, positive input foot, empty pin, negative input foot, grounding leg, output pin, the first electricity
Hinder foot, second resistance foot, enabled foot and filtering foot；The input terminal has input terminal and ground terminal, the input terminal
Input terminal is the input terminal of the detecting circuit, the ground terminal ground connection of the input terminal；The first end of first capacitance, institute
State the first end of the second capacitance and the input terminal interconnection of the input terminal, the second end ground connection of first capacitance；Described
The positive input foot of the second end of two capacitances, the first end of the first resistor and first detection chip interconnects；Described first
The second end of resistance, the first end of the third capacitance, the first end of the 4th capacitance and first detection chip it is negative
Input pin interconnects；The second end of the third capacitance and the second end of the 4th capacitance are grounded；
The first end of the second resistance is connect with power supply, the second end of the second resistance, the 5th capacitance
The supply pin interconnection of one end, the first end of the 6th capacitance, the first end of the 7th capacitance and first detection chip；
The second end of 5th capacitance is connect with the filtering foot of first detection chip；The second end and the 7th of 6th capacitance
The second end of capacitance is grounded；
The first end of the 3rd resistor is connect with the first resistor foot of first detection chip, and the second of the 3rd resistor
End ground connection；The first end of 4th resistance is connect with the second resistance foot of first detection chip, the 4th resistance
Second end is grounded；The first end of 5th resistance, the enabled foot of first detection chip and the enable signal input terminal
Interconnection, the second end ground connection of the 5th resistance；The output pin of the first end and first detection chip of 8th capacitance
Connection, the second end ground connection of the 8th capacitance；The output pin of first detection chip is the output end of the detecting circuit
Mouthful.
4. multifrequency receiver radio frequency front-end device as claimed in claim 2, which is characterized in that the clipping module includes first
Diode and the second diode, the output end of the just extremely described clipping module of first diode, first diode
The anode of cathode and second diode connect；The plus earth of second diode, second diode are born
Pole is connect with the anode of first diode, and the output end that the cathode of second diode is the clipping module.
5. such as claim 2-4 any one of them multifrequency receiver radio frequency front-end devices, which is characterized in that the disconnecting switch
Module includes electronic switch and control circuit, and the electronic switch includes first input end, the second input terminal and output end, described
The first input end of electronic switch is connect with the output end of the signal amplification module, the second input terminal of the electronic switch with
The output end of the control circuit connects, and the output end of the electronic switch is the output end of the disconnecting switch module；It is described
The input terminal of control circuit is connect with the output end of the detecting circuit；
The control circuit is used to receive the testing result signal of the detecting circuit, and the testing result signal is corresponding
Voltage value is compared with voltage protection threshold value, is protected more than or equal to the voltage in the corresponding voltage value of testing result signal
When protecting threshold value, output switch control signal, control electronic switch disconnects.
6. multifrequency receiver radio frequency front-end device as claimed in claim 5, which is characterized in that the control circuit includes first
Signal input part, first control signal output end, second control signal output end, the 6th resistance, the 7th resistance, the 8th resistance,
First amplifier and the second amplifier, the first end connection power supply of the 6th resistance, the second end of the 6th resistance,
The first end of 7th resistance and the electrode input end interconnection of first amplifier；The second end of 7th resistance, institute
State the first end of the 8th resistance and the electrode input end interconnection of second amplifier；The second end of 8th resistance is grounded；
The negative input of first amplifier connect with the negative input of second amplifier and is the control circuit
First signal input part, the output end of first amplifier are the first control signal output end of the control circuit；It is described
The output end of second amplifier is the second control signal output end of the control circuit.
7. multifrequency receiver radio frequency front-end device as claimed in claim 6, which is characterized in that the electronic switch includes the 9th
Capacitance, the tenth capacitance, the 11st capacitance, the 12nd capacitance, the 13rd capacitance, the 14th capacitance, the 15th capacitance, the 16th electricity
Appearance, the 17th capacitance, the 18th capacitance, the first inductance, the second inductance, third inductance, the 4th inductance, the 5th inductance, the 9th electricity
Resistance, the tenth resistance, eleventh resistor, third diode, the 4th diode, the 5th diode and the 6th diode；Described 9th
The first end of capacitance is connect with the output end of the signal amplification module, the second end of the 9th capacitance, the three or two pole
The first end of positive and described first inductance of positive, described 4th diode of pipe interconnects；The first end of tenth capacitance
For the output end of the electronic switch, the second end of the tenth capacitance, the cathode of the third diode, the five or two pole
The anode of pipe and the first end of second inductance interconnect；The first end of 11st capacitance, the 5th diode it is negative
The first end of pole and the 4th inductance interconnects, the second end ground connection of the 11st capacitance；The first of 12nd capacitance
End ground connection, the second end of the 12nd capacitance, the first end of the third inductance, the 4th diode cathode and the described 6th
The anode interconnection of diode；The first end of 13rd capacitance, the cathode of the 6th diode and the 5th inductance
First end interconnects, the second end ground connection of the 13rd capacitance；
The first end of the second end of first inductance, the first end of the 14th capacitance and the 9th resistance interconnects；Institute
State the second end connection power supply of the 9th resistance；The second end of 14th capacitance is grounded；
The second end of second inductance, the first end of the 15th capacitance and control circuit first control signal output
End interconnection；The second end of 15th capacitance is grounded；
The second end of the third inductance, the first end of the 16th capacitance and control circuit second control signal output
End interconnection；The second end of 16th capacitance is grounded；
The first end of the second end of 4th inductance, the first end of the tenth resistance and the 17th capacitance interconnects；Institute
State the second end ground connection of the tenth resistance；The second end of 17th capacitance is grounded；
The first end interconnection of the second end, the first end of the eleventh resistor and the 18th capacitance of 5th inductance；
The second end of the eleventh resistor is grounded；The second end of 18th capacitance is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721853147.0U CN207652427U (en) | 2017-12-26 | 2017-12-26 | Multifrequency receiver radio frequency front-end device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721853147.0U CN207652427U (en) | 2017-12-26 | 2017-12-26 | Multifrequency receiver radio frequency front-end device |
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| CN207652427U true CN207652427U (en) | 2018-07-24 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109412622A (en) * | 2018-11-29 | 2019-03-01 | 湖南迈克森伟电子科技有限公司 | A kind of radio frequency protection circuit that anti-impulse wave breakdown is burnt with continuous wave |
| CN111193524A (en) * | 2018-11-14 | 2020-05-22 | 广东新岸线计算机***芯片有限公司 | Portable analyzer for ultra-high-speed wireless local area network |
-
2017
- 2017-12-26 CN CN201721853147.0U patent/CN207652427U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111193524A (en) * | 2018-11-14 | 2020-05-22 | 广东新岸线计算机***芯片有限公司 | Portable analyzer for ultra-high-speed wireless local area network |
| CN109412622A (en) * | 2018-11-29 | 2019-03-01 | 湖南迈克森伟电子科技有限公司 | A kind of radio frequency protection circuit that anti-impulse wave breakdown is burnt with continuous wave |
| CN109412622B (en) * | 2018-11-29 | 2023-08-15 | 湖南迈克森伟电子科技有限公司 | Radio frequency protection circuit for resisting pulse wave breakdown and continuous wave burnout |
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