CN108075795A - Multifrequency receiver radio frequency front-end device - Google Patents
Multifrequency receiver radio frequency front-end device Download PDFInfo
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- CN108075795A CN108075795A CN201711451837.8A CN201711451837A CN108075795A CN 108075795 A CN108075795 A CN 108075795A CN 201711451837 A CN201711451837 A CN 201711451837A CN 108075795 A CN108075795 A CN 108075795A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/1607—Supply circuits
- H04B1/1615—Switching on; Switching off, e.g. remotely
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Signal Processing (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Abstract
The present invention 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 part；The input terminal of multiband filter is connected with signal receiving end, and the output terminal of multiband filter and the input terminal of signal detection module connect；First output terminal of signal detection module and the input terminal of clipping module connect, and the second output terminal of signal detection module is connected with the first input end of disconnecting switch module；The output terminal of clipping module is connected with the input terminal of signal amplification module；The output terminal of signal amplification module is connected with the second input terminal of disconnecting switch module；The output terminal of disconnecting switch module is connected with signal output part.The radiofrequency signal of different-waveband can be carried out at the same time processing by the present invention, and effectively multifrequency receiver radio frequency front-end device is protected.
Description
Technical field
The present invention relates to radar component and signal communication field, more particularly to a kind of multifrequency receiver radio frequency front-end device.
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, wave filter, before existing a variety of multifrequency receiver radio frequencies
End device after operation principle is the wave band for selecting some scope, 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
Receipts machine radio frequency front-end device processing signal is single.Meanwhile, it is necessary to be filtered the switching of device, limiter when handling its all band,
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.
The content of the invention
The main object of the present invention is to propose a kind of multifrequency receiver radio frequency front-end device, it is intended to solve multifrequency receiver and penetrate
The problem of frequency fore device wave band processing signal is single, processing speed is slower, and in this process, to multifrequency receiver radio frequency
Fore device carries out protection.
To achieve the above object, the present invention proposes a kind of multifrequency receiver radio frequency front-end device, and the multifrequency receiver is penetrated
Frequency fore device includes signal receiving end, multiband filter, signal detection module, clipping module, signal amplification module, keeps apart
Close module and signal output part；The signal detection module includes input terminal, the first output terminal and second output terminal；The isolation
Switch module includes first input end, the second input terminal and output terminal；The input terminal of the multiband filter connects with the signal
Receiving end connects, and the output terminal of the multiband filter is connected with the input terminal of the signal detection module, the signal detection mould
First output terminal of block is connected with the input terminal of the clipping module, the second output terminal of the signal detection module with it is described every
First input end connection from switch module；The output terminal of the clipping module and the input terminal of the signal amplification module connect
It connects；The output terminal of the signal amplification module is connected with the second input terminal of the disconnecting switch module；The disconnecting switch mould
The output terminal of block is connected with the signal output part；Wherein, the multiband filter is filtered different-waveband with multiple
Resonance filter chamber, the radiofrequency signal of 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 filtering process, 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 filtering process；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 terminal connection of device；The signal output port of the coupler is connected with the input terminal of the clipping module；The coupler
Coupled output ports be connected with the input terminal of the detecting circuit；The output terminal of the detecting circuit and the disconnecting switch mould
The first input port connection of block；The coupler, for dividing from the radiofrequency signal after the multiband filter filtering process
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, the 3rd 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 include supply pin, positive input foot, empty pin,
Negative input foot, grounding leg, output pin, first resistor foot, second resistance foot, enabled foot and filtering foot；The input terminal has
Input terminal and ground terminal, the input terminal of the input terminal are the input terminal of the detecting circuit, the ground connection of the input terminal
End ground connection；The input terminal interconnection of the first end of first capacitance, the first end of second capacitance and the input terminal, institute
State the second end ground connection of the first capacitance；The second capacitance second end, the first end of the first resistor and first detection
Chip positive input foot interconnects；The second end of the first resistor, the first end of the 3rd capacitance, the first of the 4th capacitance
The negative input foot of end and first detection chip interconnects；The second end of 3rd capacitance and the second end of the 4th capacitance
It is grounded；The first end of the second resistance is connected with power supply, the second end of the second resistance, the 5th capacitance
First end, the first end of the 6th capacitance, the supply pin of the first end of the 7th capacitance and first detection chip are mutual
Even, the second end of the 5th capacitance is connected with the filtering foot of first detection chip；The second end of 6th capacitance and
The second end of 7th capacitance is grounded；The first end of the 3rd resistor and the first resistor foot of the described first control chip connect
It connects, the second end ground connection of the 3rd resistor；The first end of 4th resistance and the second resistance of the described first control chip
Foot connects, the second end ground connection of the 4th resistance；The enabled foot of the first end of 5th resistance, the first control 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 connection of first control chip, the second end ground connection of the 8th capacitance；Described first controls the output pin of chip to be
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 terminal of the clipping module, the cathode of first diode are connected with the anode of second diode；Described second
The plus earth of diode, the cathode of second diode are connected with the anode of first diode, and the described 2nd 2
The cathode of pole pipe is the output terminal of the clipping module.
Preferably, the disconnecting switch module includes electronic switch and control circuit, and it is defeated that the electronic switch includes first
Enter end, the second input terminal and output terminal, the first input end of the electronic switch and the output terminal of the signal amplification module connect
It connects, the second input terminal of the electronic switch is connected with the output terminal of the control circuit；The input terminal of the control circuit with
The output terminal connection of the detecting circuit；The control circuit is used to receive the testing result signal of the detecting circuit, and will
The corresponding voltage value of the testing result signal is compared with voltage protection threshold value, in the corresponding voltage value of testing result signal
During more than or equal to the voltage protection threshold value, output switch control signal, control electronic switch disconnects.
Preferably, the control circuit includes the first signal input part, first control signal output terminal, second control signal
Output terminal, 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, second end, the first end of the 7th resistance and the anode of first amplifier of the 6th resistance
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 ground connection of 8th resistance；The negative input of first amplifier and second amplifier
Negative input connection and for the control circuit the first signal input part, the output terminal of first amplifier is described
The first control signal output terminal of control circuit；The output terminal of second amplifier is believed for the second control of the control circuit
Number output terminal.
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, the 3rd inductance, the 4th inductance, the 5th inductance, the 9th resistance, the tenth resistance, the 11st resistance, the 3rd diode, the four or two
Pole pipe, the 5th diode and the 6th diode；The first end of 9th capacitance connects with the output terminal of the signal amplification module
It connects, second end, the anode of the 3rd diode, the anode of the 4th diode and first electricity of the 9th capacitance
The first end interconnection of sense；The first end of tenth capacitance is the output terminal of the electronic switch module, affiliated tenth capacitance
The first end interconnection of second end, the cathode of the 3rd diode, the anode of the 5th diode and second inductance；Institute
The first end for stating the first end of the 11st capacitance, the cathode of the 5th diode and the 4th inductance interconnects, and the described tenth
The second end ground connection of one capacitance；The first end ground connection of 12nd capacitance, the second end of the 12nd capacitance, the described 3rd
The anode interconnection of the first end of inductance, the cathode of the 4th diode and the 6th diode；The first of 13rd capacitance
The first end interconnection at end, the cathode of the 6th diode and the 5th inductance, 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 is mutual
Even；The second end connection power supply of 9th resistance；The second end ground connection of 14th capacitance；
The second end of second inductance, the first end of the 15th capacitance and the control output of the control circuit first
End interconnection；The second end ground connection of 15th capacitance；
The second end of 3rd inductance, the first end of the 16th capacitance and the control output of the control circuit second
End interconnection；The second end ground connection of 16th capacitance；
The first end of the second end of 4th inductance, the first end of the tenth resistance and the 17th capacitance is mutual
Even；The second end ground connection of tenth resistance；The second end ground connection of 17th capacitance；
The first end of the second end of 5th inductance, the first end of the 11st resistance and the 18th capacitance is mutual
Even；The second end ground connection of 11st resistance；The second end ground connection of 18th capacitance.
The present invention, can be efficiently right by setting multiband filter, detection module and disconnecting switch module in circuit
The signal of different-waveband is carried out at the same time processing, achievees the purpose that multiple signals while handles, while can improve multifrequency receiver and penetrate
The processing speed of frequency fore device.The present invention also utilizes the shunting function of coupler, by detecting circuit to the signal isolated
Intensity detection is carried out, when intensity is more than circuit tolerance range, control circuit control electronic switch disconnects, and realizes and multifrequency is received
Machine radio frequency front-end device is effectively protected, moreover, realizing that the structure of invention is simple.
Description of the drawings
It in order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention, for those of ordinary skill in the art, without creative efforts, can be with
Structure according to these attached drawings obtains other attached drawings.
Fig. 1 is the high-level schematic functional block diagram of multifrequency receiver radio frequency front-end device of the present invention；
Fig. 2 is the electrical block diagram of multifrequency receiver radio frequency front-end device of the present invention；
Fig. 3 is the electrical block diagram of detecting circuit in multifrequency receiver radio frequency front-end device of the present invention；
Fig. 4 is the electrical block diagram of clipping module in multifrequency receiver radio frequency front-end device of the present invention；
Fig. 5 is the electrical block diagram of control circuit in multifrequency receiver radio frequency front-end device of the present invention；
Fig. 6 is the electrical block diagram of electronic switch in multifrequency receiver radio frequency front-end device of the present invention.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only the part of the embodiment of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, those of ordinary skill in the art obtained without creative efforts it is all its
His embodiment, belongs to the scope of protection of the invention.
If it is to be appreciated that related in the embodiment of the present invention directionality instruction (such as up, down, left, right, before and after ...),
Then directionality instruction be only used for explaining relative position relation under a certain particular pose (as shown in drawings) between each component,
Motion conditions etc., if the particular pose changes, directionality instruction also correspondingly changes correspondingly.
If in addition, relating to the description of " first ", " second " etc. in the embodiment of the present invention, " first ", " second " etc. are somebody's turn to do
Description be only used for description purpose, and it is not intended that instruction or implying its relative importance or implicit indicating indicated skill
The quantity of art feature." first " is defined as a result, and the feature of " second " can be expressed or implicitly includes at least one spy
Sign.In addition, the technical solution between each embodiment can be combined with each other, but must be with those of ordinary skill in the art's energy
Based on enough realizations, the knot of this technical solution is will be understood that when the combination appearance of technical solution is conflicting or can not realize
Conjunction is not present, also not the present invention claims protection domain within.
The present invention proposes a kind of multifrequency receiver radio frequency front-end device, suitable for radar and the communications field, can solve to receive
The wave band processing of radio-frequency front-end is single, the problems such as being easily damaged.
With reference to Fig. 1,2, in an embodiment of the present invention, 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 signal are defeated
Outlet RFO, the signal detection module 28 include input terminal, the first output terminal and second output terminal；The disconnecting switch module
31 include first input end, the second input terminal and output terminal.
Specifically, the input terminal of the multiband filter 27 and the signal receiving end RFIConnection, the multiband filter
27 output terminal is connected with the input terminal of the signal detection module 28；First output terminal 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 connects；The output terminal of the clipping module 29 is connected with the input terminal of the signal amplification module 30；The letter
The output terminal of number amplification module 30 is connected with the second input terminal of the disconnecting switch module 31；The disconnecting switch module 31
Output terminal and the signal output part RFOConnection；The multiband filter 27, have it is multiple different-waveband is filtered it is humorous
Vibration 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 filtering process；
The signal detection module 28 is detected for the intensity to the radiofrequency signal after filtering process, and by testing result
It is sent to disconnecting switch module 31；The clipping module 29, for being carried out to the radiofrequency signal after filtering process at amplitude limit
Reason；The signal amplification module 30, for being amplified processing to the radiofrequency signal after amplitude limiting processing；The disconnecting switch
Module 31, for when the intensity of the radiofrequency signal is more than rotection thresholds, being turned off, to cut off the signal amplification module
Output.
Pass through setting signal receiving terminal RFI, multiband filter 27, signal detection module 28, clipping module 29, signal amplification
Module 30, disconnecting switch module 31 and signal output part RFO；The multiband filter 27 can be to signal receiving end RFIIt receives
The radiofrequency signal of multiple wave bands is carried out at the same time filtering process, and between the radiofrequency signal of multiple wave bands independently of each other, at filtering
Radiofrequency signal after reason is output to signal detection module 28, and signal detection module 28 carries out intensity detection to these radiofrequency signals
And testing result signal is sent to disconnecting switch module 31, when testing result signal is more than signal strength threshold, keep apart
It closes module 31 to disconnect, cuts off the radiofrequency signal output of the signal amplification module 30, signal processing is single, speed so as to solve
It crosses 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 connected with the output terminal 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 connected 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 terminal of the detecting circuit 11 and the disconnecting switch module 31
First input port connection.
The detecting circuit 11, the inspection are conveyed to by setting coupler 12 that main radiofrequency signal is isolated part signal
Whether wave circuit 11 is detected the portion radio frequency signal strength that coupler 12 is isolated, to determine signal strength in circuit
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, the 3rd 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, and the ground terminal of the input terminal is grounded；
The input terminal of the first end of the first capacitance C1, the first end of the second capacitance C2 and the input terminal is mutual
Even, the second end ground connection of the first capacitance C1；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 interconnects；The second end of the first resistor R1, the first end of the 3rd capacitance C3,
The first end of the 4th capacitance C4 and the negative input foot 4 of first detection chip interconnect, and the second of the 3rd capacitance C3
The second end of end and the 4th capacitance C4 are grounded；
The first end of the second resistance R2 is connected 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 connected with the filtering foot 10 of first detection chip；It is described
The second end of 6th capacitance C6 and the second end of the 7th capacitance C7 are grounded；
The first end of the 3rd resistor R3 is connected with the first resistor foot 7 of the described first control chip, the 3rd electricity
Hinder the second end ground connection of R3；The first end of the 4th resistance R4 is connected with the second resistance foot 8 of the described first control chip, institute
State the second end ground connection of the 4th resistance R4；The first end of the 5th resistance R5, the enabled foot of the first control chip and institute
State the interconnection of enable signal input terminal, the second end ground connection of the 5th resistance R5；The enabled foot 9 of the first control chip is core
Piece drives port；The first end of the 8th capacitance C8 is connected with the output pin 6 of the described first control chip, the 8th capacitance
The second end ground connection of C8；The output pin 6 of the first control chip is the output port J2 of 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 output terminal RF of the just extremely described 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 terminal 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 terminal, the first input end of the electronic switch 14 with it is described
The output terminal connection of signal amplification module 30, the second input terminal of the electronic switch 14 and the output terminal of the control circuit 13
Connection；The input terminal of the control circuit 13 is connected with the output terminal 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 connection power supply V2 of device N2, the 6th resistance R6, 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 ground connection of the 8th resistance R8；
The negative input of the first amplifier N1 is connected with the negative input of the second amplifier N2 and controls electricity to be described
The output terminal of first the signal input part Vin, the first amplifier N1 on road 13 is believed for the first control of the control circuit 13
Number output end vo ut1；The output terminal of the second amplifier N2 is the second control signal output terminal of the control circuit 13
Vout2。
It should be noted that the embodiment of above-mentioned control circuit 13 is merely a preferred embodiment of the present invention, it is any to realize this skill
The available circuit connection mode of art 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, the 3rd inductance L3, the 4th inductance L4, the 5th inductance L5, the 9th
Resistance R9, the tenth resistance R10, the 11st resistance R11, the 3rd diode D3, the 4th diode D4, the 5th diode D5 and the 6th
Diode D6；The first end of the 9th capacitance C9 is connected with the output terminal of the signal amplification module 30, the 9th capacitance
The second end of C9, the anode of the 3rd diode D3, the of the anode of the 4th diode D4 and the first inductance L1
One end interconnects；The first end of the tenth capacitance C10 is the output terminal of the electronic switch 14, the of affiliated tenth capacitance C10
Two ends, the cathode of the 3rd diode D3, the first end of the anode of the 5th diode D5 and the second inductance L2 are mutual
Even；The first end of the first end of the 11st capacitance C11, the cathode of the 5th diode D5 and the 4th inductance L4 is mutual
Even, the second end ground connection of the 11st capacitance C11；The first end of the 12nd capacitance C12 is RF3, is connect under normal circumstances
Ground, the second end of the 12nd capacitance C12, the first end of the 3rd inductance L3, the cathode of the 4th diode D4 and described
The anode interconnection of 6th diode D6；The first end of the 13rd capacitance C13, the cathode of the 6th diode D6 and described
5th inductance L5 first ends interconnect, the second end ground connection of the 13rd capacitance C13；The second end of the first inductance L1, institute
State the first end of the 14th capacitance C14 and the first end interconnection of the 9th resistance R9；The second end V6 of the 9th resistance R9
Connect power supply；The other end ground connection of the 14th capacitance C14；The second end of the second inductance L2, the described 15th
First end V4 and the first control output end of the control circuit Vout1 interconnection of capacitance C15；The of the 15th capacitance C15
Two ends are grounded；The second end of the 3rd inductance L3, the first end of the 16th capacitance C16 and the control circuit second are controlled
Output end vo ut2 interconnection processed；The second end ground connection of the 16th capacitance C16；The second end of the 4th inductance L4, described
The first end of ten resistance R10 and the interconnection of the first end of the 17th capacitance C1；The second end B1 of the tenth resistance R10 connects
Ground；The second end ground connection of the 17th capacitance C17；The of the second end of the 5th inductance L5, the 11st resistance R11
The first end of one end and the 18th capacitance C18 interconnect；The second end B2 ground connection of the 11st resistance R11；Described tenth
The second end ground connection of eight capacitance C18.
By setting the 3rd diode D3, the 4th diode D4, the 5th diode D5 and the six or two in the electronic switch
Pole pipe D6, the 3rd diode D3, the 4th diode D4, the 5th diode D5 and the 6th diode D6 are in control circuit 13
Under the action of DC control signal, the approximate impedance operator being switched on or off of presentation, the transmission channel of energy control signal, so as to
The closure of electronic switch can be controlled, i.e., when electronic switch 14 is under normally state, 14 main radiofrequency signal of electronic switch
Input terminal RFC is connected with main RF signal output RF1, and multifrequency receiver radio frequency front-end device normally exports；Electronic switch 14
It is off down, 14 main RF signal input end RFC of electronic switch is connected with ground terminal RF3, main RF signal output
RF1 is disconnected without output, i.e. multifrequency receiver radio frequency front-end device, 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, there is the faint of multiple wave bands when multiband filter 27 receives the external world by signal receiving end
During radiofrequency signal, these signals are separated into multiple resonators independent mutually while handle by multiband filter 27, and simultaneously
It is output in coupler 12, these signals are separated portion radio frequency signal 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 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 be 3.5V-5V (high level), the control
Second control output end Vout2 voltage values of circuit 13 are 0V-0.7V (low level)；The three or two pole in the electronic switch 14
Pipe D3 cut-offs, the 5th diode D5 conductings, the 4th diode D4 conductings, the 6th diode D6 cut-offs, the control circuit connect
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；
First control output end Vout1 voltage values of the control circuit 13 are 0V-0.7V (low level), the of the control circuit 13
Two control output end Vout2 voltage values are 3.5V-5V (high level)；In the electronic switch 14 the 3rd diode D3 cut-off,
5th diode D5 conductings, the 4th diode D4 cut-offs, the 6th diode D6 conductings, the main radiofrequency signal of the control circuit 13
Output terminal exports radiofrequency signal.
By setting clipping module 29 and amplification module 30 in multifrequency receiver radio frequency front-end device, ensure that multifrequency receives
The basic function of machine radio frequency front-end device then by setting multiband filter 27, goes to realize the radio frequency letter of multiple and different wave bands
Number simultaneously processing and mutually independent function, are made that the prior art improvements, and the device volume of realization function is than existing
Multifrequency receiver radio frequency front-end device it is small, it is simple in structure.In addition, letter is set 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, 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 so as to reach in the case of the radiofrequency signal of multiple wave bands while processing, protect circuit
Purpose.
The foregoing is merely the preferred embodiment of the present invention, are not intended to limit the scope of the invention, every at this
The equivalent structure transformation made under the inventive concept of invention using description of the invention and accompanying drawing content or directly/utilization indirectly
It is included in other related technical areas in the scope of patent protection of the present invention.
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 terminal and second output terminal；The disconnecting switch module includes the
One input terminal, the second input terminal and output terminal；The input terminal of the multiband filter is connected with the signal receiving end, described more
The output terminal of frequency wave filter is connected with the input terminal of the signal detection module；First output terminal of the signal detection module with
The input terminal connection of the clipping module, the second output terminal of the signal detection module and the first of the disconnecting switch module
Input terminal connects；The output terminal of the clipping module is connected with the input terminal of the signal amplification module；The signal amplifies mould
The output terminal of block is connected with the second input terminal of the disconnecting switch module；The output terminal of the disconnecting switch module and the letter
The connection of number output terminal；
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 is carried out at the same time filtering process；
The signal detection module is detected for the intensity to the radiofrequency signal after filtering process, 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 filtering process；
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 connected with the output terminal of the multiband filter；The signal output port of the coupler with it is described
The input terminal connection of clipping module；The coupled output ports of the coupler are connected with the input terminal of the detecting circuit；It is described
The output terminal of detecting circuit is connected with the first input port of the disconnecting switch module；
The coupler, for isolating detection signal from the radiofrequency signal after the multiband filter filtering process；
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, the 3rd 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, and the ground terminal of the input terminal is grounded；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 interconnection of the second end of two capacitances, the first end of the first resistor and first detection chip；Described first
The second end of resistance, the first end of the 3rd capacitance, the first end of the 4th capacitance and first detection chip it is negative
Input pin interconnects；The second end of 3rd capacitance and the second end of the 4th capacitance are grounded；
The first end of the second resistance is connected with power supply, the second end of the second resistance, the of the 5th capacitance
One end, the supply pin interconnection of 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 connected 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 connected with the first resistor foot of the described first control chip, and the second of the 3rd resistor
End ground connection；The first end of 4th resistance is connected with the second resistance foot of the described first control chip, the 4th resistance
Second end is grounded；The first end of 5th resistance, the enabled foot of the first control chip and the enable signal input terminal
Interconnection, the second end ground connection of the 5th resistance；The first end of 8th capacitance and the output pin of the described first control chip
Connection, the second end ground connection of the 8th capacitance；Described first controls the output pin of chip as the output terminal 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 terminal of the just extremely described clipping module of first diode, first diode
Cathode be connected with the anode of second diode；The plus earth of second diode, second diode are born
Pole is connected with the anode of first diode, and the output terminal that the cathode of second diode is the clipping module.
5. such as claim 1-4 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 terminal, described
The first input end of electronic switch is connected with the output terminal of the signal amplification module, the second input terminal of the electronic switch with
The output terminal connection of the control circuit, the output terminal of the electronic switch are the output terminal of the disconnecting switch module；It is described
The input terminal of control circuit is connected with the output terminal 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 protected compared with voltage protection threshold value in the corresponding voltage value of testing result signal more than or equal to the voltage
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 terminal, second control signal output terminal, 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 ground connection of 8th resistance；
The negative input of first amplifier is connected with the negative input of second amplifier and is the control circuit
First signal input part, the output terminal of first amplifier are the first control signal output terminal of the control circuit；It is described
The output terminal of second amplifier is the second control signal output terminal 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, the 3rd inductance, the 4th inductance, the 5th inductance, the 9th electricity
Resistance, the tenth resistance, the 11st resistance, the 3rd diode, the 4th diode, the 5th diode and the 6th diode；Described 9th
The first end of capacitance is connected with the output terminal of the signal amplification module, the second end of the 9th capacitance, the three or two pole
The first end interconnection of the anode of pipe, the anode of the 4th diode and first inductance；The first end of tenth capacitance
For the output terminal of the electronic switch module, the second end of affiliated tenth capacitance, the cathode of the 3rd diode, the described 5th
The first end of the anode of diode and second inductance interconnects；The first end of 11st capacitance, the 5th diode
Cathode and the 4th inductance first end interconnection, the 11st capacitance second end ground connection；12nd capacitance
First end is grounded, the second end of the 12nd capacitance, the first end of the 3rd inductance, the cathode of the 4th diode and described
The anode interconnection of 6th diode；The first end of 13rd capacitance, the cathode of the 6th diode and the 5th electricity
The first end interconnection of sense, the second end ground connection of the 13rd capacitance；
The first end interconnection of the second end of first inductance, the first end of the 14th capacitance and the 9th resistance；Institute
State the second end connection power supply of the 9th resistance；The second end ground connection of 14th capacitance；
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 ground connection of 15th capacitance；
The second end of 3rd inductance, the first end of the 16th capacitance and control circuit second control signal output
End interconnection；The second end ground connection of 16th capacitance；
The first end interconnection of the second end of 4th inductance, the first end of the tenth resistance and the 17th capacitance；Institute
State the second end ground connection of the tenth resistance；The second end ground connection of 17th capacitance；
The first end interconnection of the second end of 5th inductance, the first end of the 11st resistance and the 18th capacitance；
The second end ground connection of 11st resistance；The second end ground connection of 18th capacitance.
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| CN201711451837.8A CN108075795B (en) | 2017-12-26 | 2017-12-26 | Radio frequency front-end device of multi-frequency receiver |
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| CN201711451837.8A CN108075795B (en) | 2017-12-26 | 2017-12-26 | Radio frequency front-end device of multi-frequency receiver |
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| CN108075795B CN108075795B (en) | 2023-11-28 |
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| CN111654250A (en) * | 2020-06-10 | 2020-09-11 | 河源广工大协同创新研究院 | Millimeter wave self-adaptive amplitude limiter applied to radio frequency front-end receiver |
| CN113824416A (en) * | 2021-09-08 | 2021-12-21 | 西安电子科技大学 | Semi-active full-detection type amplitude limiting circuit |
| US20220349839A1 (en) * | 2019-07-12 | 2022-11-03 | Zte Corporation | Device for detecting sar, method for reducing sar, and mobile terminal |
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| CN108075795B (en) | 2023-11-28 |
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