CN108075795B - Radio frequency front-end device of multi-frequency receiver - Google Patents
Radio frequency front-end device of multi-frequency receiver Download PDFInfo
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- CN108075795B CN108075795B CN201711451837.8A CN201711451837A CN108075795B CN 108075795 B CN108075795 B CN 108075795B CN 201711451837 A CN201711451837 A CN 201711451837A CN 108075795 B CN108075795 B CN 108075795B
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- 239000003990 capacitor Substances 0.000 claims description 142
- 238000001914 filtration Methods 0.000 claims description 22
- 238000002955 isolation Methods 0.000 claims description 10
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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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Abstract
The invention discloses a radio frequency front-end device of a multi-frequency receiver, which comprises a signal receiving end, a multi-frequency filter, a signal detection module, a limiting module, a signal amplifying module, an isolating switch module and a signal output end; the input end of the multi-frequency filter is connected with the signal receiving end, and the output end of the multi-frequency filter is connected with the input end of the signal detection module; the first output end of the signal detection module is connected with the input end of the amplitude limiting module, and the second output end of the signal detection module is connected with the first input end of the isolating switch module; the output end of the amplitude limiting module is connected with the input end of the signal amplifying module; the output end of the signal amplification module is connected with the second input end of the isolating switch module; the output end of the isolating switch module is connected with the signal output end. The invention can process the radio frequency signals of different wave bands simultaneously and effectively protect the radio frequency front-end device of the multi-frequency receiver.
Description
Technical Field
The invention relates to the field of radar components and signal communication, in particular to a radio frequency front-end device of a multi-frequency receiver.
Background
The RF front-end device of multi-frequency receiver is an important component of communication system, in the prior art, the RF front-end device of multi-frequency receiver mainly comprises low noise amplifier, limiter and filter, and the working principle of the RF front-end device of multi-frequency receiver is that after selecting a wave band in a certain range, the signal is filtered, limited and amplified, and finally a wave band is selected to be output or directly output. In this process, the operating band range of the rf front-end device of the multi-frequency receiver may be selected according to the need, but the rf front-end device of the multi-frequency receiver can only process one band at a time, so that the rf front-end device of the multi-frequency receiver processes a single signal. Meanwhile, when other wave bands are processed, the switching of a filter and a limiter is needed, and the processing speed is low. Moreover, the signal range required to be processed is too large, and once the signal range exceeds the bearing range of components, the whole radio frequency front-end device of the multi-frequency receiver is damaged.
Disclosure of Invention
The main purpose of the present invention is to provide a RF front-end device of a multi-frequency receiver, which aims to solve the problems of single band processing signal and slower processing speed of the RF front-end device of the multi-frequency receiver, and to protect the RF front-end device of the multi-frequency receiver in the process.
In order to achieve the above objective, the present invention provides a rf front-end device of a multi-frequency receiver, which includes a signal receiving end, a multi-frequency filter, a signal detection module, a limiting module, a signal amplifying module, an isolating switch module and a signal output end; the signal detection module comprises an input end, a first output end and a second output end; the isolating switch module comprises a first input end, a second input end and an output end; the input end of the multi-frequency filter is connected with the signal receiving end, the output end of the multi-frequency filter is connected with the input end of the signal detection module, the first output end of the signal detection module is connected with the input end of the amplitude limiting module, and the second output end of the signal detection module is connected with the first input end of the isolating switch module; the output end of the amplitude limiting module is connected with the input end of the signal amplifying module; the output end of the signal amplification module is connected with the second input end of the isolating switch module; the output end of the isolating switch module is connected with the signal output end; the multi-frequency filter is provided with a plurality of resonant filter cavities for filtering different wave bands and is used for simultaneously filtering the radio frequency signals of the different wave bands received by the signal receiving end; the signal detection module is used for detecting the intensity of the radio frequency signal after the filtering treatment and sending the detection result to the signal isolation module; the amplitude limiting module is used for carrying out amplitude limiting processing on the radio frequency signals subjected to the filtering processing; the signal amplification module is used for amplifying the radio frequency signals subjected to amplitude limiting treatment; and the isolating switch module is used for switching off when the intensity of the radio frequency signal is greater than a protection threshold value so as to cut off the output of the signal amplifying module.
Preferably, the signal detection module comprises a coupler and a detection circuit, wherein the coupler comprises a signal input port, a signal output port, a coupling output port and an isolation port; the signal input port of the coupler is connected with the output end of the multi-frequency filter; the signal output port of the coupler is connected with the input end of the amplitude limiting module; the coupling output port of the coupler is connected with the input end of the detection circuit; the output end of the detection circuit is connected with the first input port of the isolating switch module; the coupler is used for separating detection signals from the radio frequency signals after the multi-frequency filter is used for filtering; the detection circuit is used for detecting the detection signal separated by the coupler and outputting a detection result signal.
Preferably, the detection circuit includes an input terminal, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first detection chip, and an enable signal input terminal; the first detection chip comprises a power supply pin, a positive input pin, a null pin, a negative input pin, a ground pin, an output pin, a first resistor pin, a second resistor pin, an enabling pin and a filtering pin; the input terminal is provided with an input end and a grounding end, the input end of the input terminal is the input end of the detection circuit, and the grounding end of the input terminal is grounded; the first end of the first capacitor, the first end of the second capacitor and the input end of the input terminal are interconnected, and the second end of the first capacitor is grounded; the second end of the second capacitor, the first end of the first resistor and the positive input pin of the first detection chip are interconnected; the second end of the first resistor, the first end of the third capacitor, the first end of the fourth capacitor and the negative input pin of the first detection chip are interconnected; the second end of the third capacitor and the second end of the fourth capacitor are grounded; the first end of the second resistor is connected with a power supply, the second end of the second resistor, the first end of the fifth capacitor, the first end of the sixth capacitor, the first end of the seventh capacitor and the power supply pin of the first detection chip are interconnected, and the second end of the fifth capacitor is connected with the filtering pin of the first detection chip; the second end of the sixth capacitor and the second end of the seventh capacitor are grounded; the first end of the third resistor is connected with the first resistor pin of the first control chip, and the second end of the third resistor is grounded; the first end of the fourth resistor is connected with the second resistor pin of the first control chip, and the second end of the fourth resistor is grounded; the first end of the fifth resistor, the enabling pin of the first control chip and the enabling signal input end are interconnected, and the second end of the fifth resistor is grounded; the first end of the eighth capacitor is connected with the output pin of the first control chip, and the second end of the eighth capacitor is grounded; the output pin of the first control chip is an output port of the detection circuit.
Preferably, the amplitude limiting module comprises a first diode and a second diode, wherein the positive electrode of the first diode is an output end of the amplitude limiting module, and the negative electrode of the first diode is connected with the positive electrode of the second diode; the positive electrode of the second diode is grounded, the negative electrode of the second diode is connected with the positive electrode of the first diode, and the negative electrode of the second diode is the output end of the amplitude limiting module.
Preferably, the isolating switch module comprises an electronic switch and a control circuit, the electronic switch comprises a first input end, a second input end and an output end, the first input end of the electronic switch is connected with the output end of the signal amplifying module, and the second input end of the electronic switch is connected with the output end of the control circuit; the input end of the control circuit is connected with the output end of the detection circuit; the control circuit is used for receiving a detection result signal of the detection circuit, comparing a voltage value corresponding to the detection result signal with a voltage protection threshold value, and outputting a switch control signal to control the electronic switch to be turned off when the voltage value corresponding to the detection result signal is larger than or equal to the voltage protection threshold value.
Preferably, the control circuit comprises a first signal input end, a first control signal output end, a second control signal output end, a sixth resistor, a seventh resistor, an eighth resistor, a first amplifier and a second amplifier, wherein the first end of the sixth resistor is connected with a power supply, and the second end of the sixth resistor, the first end of the seventh resistor and the positive electrode input end of the first amplifier are interconnected; the second end of the seventh resistor, the first end of the eighth resistor and the positive electrode input end of the second amplifier are interconnected; the second end of the eighth resistor is grounded; the negative electrode input end of the first amplifier is connected with the negative electrode input end of the second amplifier and is a first signal input end of the control circuit, and the output end of the first amplifier is a first control signal output end of the control circuit; the output end of the second amplifier is a second control signal output end of the control circuit.
Preferably, the electronic switch includes a ninth capacitance, a tenth capacitance, an eleventh capacitance, a twelfth capacitance, a thirteenth capacitance, a fourteenth capacitance, a fifteenth capacitance, a sixteenth capacitance, a seventeenth capacitance, an eighteenth capacitance, a first inductance, a second inductance, a third inductance, a fourth inductance, a fifth inductance, a ninth resistance, a tenth resistance, an eleventh resistance, a third diode, a fourth diode, a fifth diode, and a sixth diode; the first end of the ninth capacitor is connected with the output end of the signal amplifying module, and the second end of the ninth capacitor, the anode of the third diode, the anode of the fourth diode and the first end of the first inductor are interconnected; the first end of the tenth capacitor is the output end of the electronic switch module, and the second end of the tenth capacitor, the negative electrode of the third diode, the positive electrode of the fifth diode and the first end of the second inductor are interconnected; a first end of the eleventh capacitor, a negative electrode of the fifth diode and a first end of the fourth inductor are interconnected, and a second end of the eleventh capacitor is grounded; the first end of the twelfth capacitor is grounded, and the second end of the twelfth capacitor, the first end of the third inductor, the negative electrode of the fourth diode and the positive electrode of the sixth diode are interconnected; a first end of the thirteenth capacitor, a cathode of the sixth diode and a first end of the fifth inductor are interconnected, and a second end of the thirteenth capacitor is grounded;
a second end of the first inductor, a first end of the fourteenth capacitor and a first end of the ninth resistor are interconnected; the second end of the ninth resistor is connected with a power supply; the second end of the fourteenth capacitor is grounded;
the second end of the second inductor, the first end of the fifteenth capacitor and the first control output end of the control circuit are interconnected; the second end of the fifteenth capacitor is grounded;
a second end of the third inductor, a first end of the sixteenth capacitor and a second control output end of the control circuit are interconnected; the second end of the sixteenth capacitor is grounded;
a second end of the fourth inductor, a first end of the tenth resistor and a first end of the seventeenth capacitor are interconnected; the second end of the tenth resistor is grounded; the second end of the seventeenth capacitor is grounded;
a second end of the fifth inductor, a first end of the eleventh resistor and a first end of the eighteenth capacitor are interconnected; the second end of the eleventh resistor is grounded; the second end of the eighteenth capacitor is grounded.
The multi-frequency filter, the detection module and the isolating switch module are arranged in the circuit, so that signals in different wave bands can be processed at the same time with high efficiency, the aim of processing a plurality of signals at the same time is fulfilled, and the processing speed of the radio-frequency front-end device of the multi-frequency receiver can be improved. The invention also utilizes the shunt effect of the coupler to detect the intensity of the separated signal through the detection circuit, and when the intensity exceeds the bearing range of the circuit, the control circuit controls the electronic switch to be disconnected, thereby realizing effective protection of the radio frequency front end device of the multi-frequency receiver.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of functional blocks of a RF front-end device of a multi-frequency receiver according to the present invention;
fig. 2 is a schematic circuit diagram of a rf front-end device of a multi-frequency receiver according to the present invention;
FIG. 3 is a schematic circuit diagram of a detection circuit in a RF front-end device of the multi-frequency receiver according to the present invention;
fig. 4 is a schematic circuit structure diagram of a clipping module in the rf front-end device of the multi-frequency receiver according to the present invention;
FIG. 5 is a schematic circuit diagram of a control circuit in the RF front-end device of the multi-frequency receiver according to the present invention;
fig. 6 is a schematic circuit diagram of an electronic switch in the rf front-end device of the multi-frequency receiver according to the present invention.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present invention, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
The invention provides a radio frequency front-end device of a multi-frequency receiver, which is suitable for the fields of radars and communication and can solve the problems of single wave band processing, easy damage and the like of the radio frequency front-end.
Referring to fig. 1 and 2, in one embodiment of the present invention, a radio frequency front-end device of a multi-frequency receiver includes a signal receiving end RF I A multi-frequency filter 27, a signal detection module 28, a limiting module 29, a signal amplification module 30, an isolating switch module 31 and a signal output end RF O The signal detection module 28 includes an input, a first output, and a second output; the isolating switch module 31 includes a first input terminal, a second input terminal, and an output terminal.
Specifically, the input end of the multi-frequency filter 27 and the signal receiving end RF I The output end of the multi-frequency filter 27 is connected with the input end of the signal detection module 28; a first output end of the signal detection module 28 is connected with an input end of the amplitude limiting module 29, and a second output end of the signal detection module 28 is connected with a first input end of the isolating switch module 31; the output end of the amplitude limiting module 29 is connected with the input end of the signal amplifying module 30; the output end of the signal amplification module 30 is connected with the second input end of the isolating switch module 31; the output end of the isolating switch module 31 and the signal output end RF O Connecting; the multi-frequency filter 27 has a plurality of resonant cavities for filtering different wave bands for RF at the signal receiving end I The received radio frequency signals with different wave bands are simultaneously subjected to filtering treatment; the signal detection module 28 is configured to detect the strength of the radio frequency signal after the filtering process, and send the detection result to the isolation switch module 31; the limiting module 29 is configured to perform limiting processing on the radio frequency signal after the filtering processing; the signal amplifying module 30 is configured to amplify the radio frequency signal after the clipping processing; the isolating switch module 31 is configured to switch off when the intensity of the radio frequency signal is greater than a protection threshold value, so as to cut off the output of the signal amplifying module.
By setting signal receiving end RF I A multi-frequency filter 27, a signal detection module 28, a limiting module 29, a signal amplification module 30, an isolating switch module 31 and a signal output end RF O The method comprises the steps of carrying out a first treatment on the surface of the The multi-frequency filter 27 can be applied to the signal receiving end RF I The received radio frequency signals of a plurality of wave bands are subjected to filtering processing simultaneously, the radio frequency signals of the wave bands are mutually independent, the radio frequency signals after the filtering processing are output to the signal detection module 28, the signal detection module 28 detects the intensity of the radio frequency signals and sends detection result signals to the isolating switch module 31, when the detection result signals exceed a signal intensity threshold value, the isolating switch module 31 is disconnected to cut off the radio frequency signal output of the signal amplification module 30, and therefore the problems that the signal processing is single, the speed is too slow, and the signal intensity exceeds the circuit bearing range due to excessive signals are solved.
Optionally, as shown in fig. 3, the signal detection module 28 includes a coupler 12 and a detection circuit 11, where the coupler 12 includes a signal input port, a signal output port, a coupling output port, and an isolation port; the signal input port of the coupler 12 is connected with the output end of the multi-frequency filter 27; the signal output port of the coupler 12 is connected with the input end of the limiting module 29; the coupling output port of the coupler 12 is connected with the input end of the detection circuit 11; the isolated port of the coupler 12 is normally not output; an output terminal of the detection circuit 11 is connected to a first input port of the isolation switch module 31.
The coupler 12 is arranged to separate a part of the main radio frequency signal and transmit the separated part of the main radio frequency signal to the detection circuit 11, the detection circuit 11 detects the intensity of the part of the radio frequency signal separated by the coupler 12 to determine whether the intensity of the signal is in a circuit bearing range, and then the detection circuit 11 outputs a detection result signal according to the detection result.
The coupler 12 is preferably a microstrip directional coupler, and the coupler 12 is not limited to a specific coupler, and other types of couplers capable of implementing the present scheme are included.
Optionally, the detection circuit 28 includes an input terminal J1, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C9, an eighth capacitor C8, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a first detection chip and enable signal input EN; the first detection chip comprises a power supply pin 1, a positive input pin 2, a null pin 3, a negative input pin 4, a grounding pin 5, an output pin 6, a first resistor pin 7, a second resistor pin 8, an enabling pin 9 and a filtering pin 19; the input terminal J1 has an input end and a ground end, the input end of the input terminal J1 is the input end of the detection circuit 28, and the ground end of the input terminal is grounded;
the first end of the first capacitor C1, the first end of the second capacitor C2 and the input end of the input terminal are interconnected, and the second end of the first capacitor C1 is grounded; the second end of the second capacitor C2, the first end of the first resistor R1 and the positive input pin 2 of the first detection chip are interconnected; the second end of the first resistor R1, the first end of the third capacitor C3, the first end of the fourth capacitor C4 and the negative input pin 4 of the first detection chip are interconnected, and the second end of the third capacitor C3 and the second end of the fourth capacitor C4 are grounded;
the first end of the second resistor R2 is connected with the power supply V1, and the second end of the second resistor R2, the first end of the fifth capacitor C5, the first end of the sixth capacitor C6, the first end of the seventh capacitor C7 and the power pin 1 of the first detection chip are interconnected; the second end of the fifth capacitor C5 is connected with the filtering pin 10 of the first detection chip; the second end of the sixth capacitor C6 and the second end of the seventh capacitor C7 are grounded;
the first end of the third resistor R3 is connected with the first resistor pin 7 of the first control chip, and the second end of the third resistor R3 is grounded; the first end of the fourth resistor R4 is connected with the second resistor pin 8 of the first control chip, and the second end of the fourth resistor R4 is grounded; a first end of the fifth resistor R5, an enabling pin of the first control chip and the enabling signal input end are interconnected, and a second end of the fifth resistor R5 is grounded; the enabling pin 9 of the first control chip is a chip driving port; a first end of the eighth capacitor C8 is connected with the output pin 6 of the first control chip, and a second end of the eighth capacitor C8 is grounded; the output pin 6 of the first control chip is the output port J2 of the detection circuit 28.
Optionally, as shown in fig. 4, the clipping module 29 includes a first diode D1 and a second diode D2, where the positive pole of the first diode D1 is the output end RF of the clipping module 29 IN The cathode of the first diode D1 is connected with the anode of the second diode D2; the positive electrode of the second diode D2 is grounded, the negative electrode of the second diode D2 is connected with the positive electrode of the first diode D1, and the negative electrode of the second diode D2 is also the output end RF of the limiting module 29 OUT 。
Optionally, as shown in fig. 5 and 6, the isolating switch module 31 includes an electronic switch 14 and a control circuit 13, where the electronic switch 14 includes a first input terminal, a second input terminal and an output terminal, the first input terminal of the electronic switch 14 is connected to the output terminal of the signal amplifying module 30, and the second input terminal of the electronic switch 14 is connected to the output terminal of the control circuit 13; an input terminal of the control circuit 13 is connected to an output terminal of the detection circuit 11.
The control circuit 13 receives the detection result signal of the detection circuit 11, performs corresponding comparison according to the detection result signal of the detection circuit 11, and outputs a dc control signal when the detection result signal exceeds a set signal intensity threshold value, so as to control the electronic switch 14 to be turned off, thereby realizing circuit protection.
Optionally, the control circuit 13 includes a first signal input terminal Vin, a first control signal output terminal Vout1, a second control signal output terminal Vout2, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a first amplifier N1 and a second amplifier N2, a first end of the sixth resistor R6 is connected to the power supply V2, and a second end of the sixth resistor R6, a first end of the seventh resistor R7 and an anode input terminal of the first amplifier N1 are interconnected; a second end of the seventh resistor R7, a first end of the eighth resistor R8 and a positive input end of the second amplifier N2 are interconnected; the second end of the eighth resistor R8 is grounded; the negative input end of the first amplifier N1 is connected with the negative input end of the second amplifier N2 and is a first signal input end Vin of the control circuit 13, and the output end of the first amplifier N1 is a first control signal output end Vout1 of the control circuit 13; the output end of the second amplifier N2 is a second control signal output end Vout2 of the control circuit 13.
It should be noted that the embodiment of the control circuit 13 is only a preferred embodiment of the present invention, and any existing circuit connection manner capable of achieving the technical effect is included.
Optionally, the electronic switch 14 includes a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12, a thirteenth capacitor C13, a fourteenth capacitor C14, a fifteenth capacitor C15, a sixteenth capacitor C16, a seventeenth capacitor C17, an eighteenth capacitor C18, a first inductor L1, a second inductor L2, a third inductor L3, a fourth inductor L4, a fifth inductor L5, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a third diode D3, a fourth diode D4, a fifth diode D5, and a sixth diode D6; a first end of the ninth capacitor C9 is connected to the output end of the signal amplifying module 30, and a second end of the ninth capacitor C9, the anode of the third diode D3, the anode of the fourth diode D4 and the first end of the first inductor L1 are interconnected; the first end of the tenth capacitor C10 is an output end of the electronic switch 14, and the second end of the tenth capacitor C10, the negative electrode of the third diode D3, the positive electrode of the fifth diode D5 and the first end of the second inductor L2 are interconnected; a first end of the eleventh capacitor C11, a negative electrode of the fifth diode D5 and a first end of the fourth inductor L4 are interconnected, and a second end of the eleventh capacitor C11 is grounded; the first end of the twelfth capacitor C12 is RF3, and is grounded, and the second end of the twelfth capacitor C12, the first end of the third inductor L3, the cathode of the fourth diode D4 and the anode of the sixth diode D6 are interconnected; a first end of the thirteenth capacitor C13, a negative electrode of the sixth diode D6 and a first end of the fifth inductor L5 are interconnected, and a second end of the thirteenth capacitor C13 is grounded; a second end of the first inductor L1, a first end of the fourteenth capacitor C14 and a first end of the ninth resistor R9 are interconnected; the second end V6 of the ninth resistor R9 is connected with a power supply; the other end of the fourteenth capacitor C14 is grounded; the second end of the second inductor L2, the first end V4 of the fifteenth capacitor C15 and the first control output Vout1 of the control circuit are interconnected; the second end of the fifteenth capacitor C15 is grounded; a second end of the third inductor L3, a first end of the sixteenth capacitor C16 and a second control output Vout2 of the control circuit are interconnected; a second end of the sixteenth capacitor C16 is grounded; a second end of the fourth inductor L4, a first end of the tenth resistor R10 and a first end of the seventeenth capacitor C1 are interconnected; the second end B1 of the tenth resistor R10 is grounded; the second end of the seventeenth capacitor C17 is grounded; a second end of the fifth inductor L5, a first end of the eleventh resistor R11 and a first end of the eighteenth capacitor C18 are interconnected; the second end B2 of the eleventh resistor R11 is grounded; the second end of the eighteenth capacitor C18 is grounded.
By arranging the third diode D3, the fourth diode D4, the fifth diode D5 and the sixth diode D6 in the electronic switch, the third diode D3, the fourth diode D4, the fifth diode D5 and the sixth diode D6 present impedance characteristics similar to on or off under the action of a direct current control signal of the control circuit 13, and can control a signal transmission channel, so that the electronic switch can be controlled to be closed, namely when the electronic switch 14 is in a normal on state, a main radio frequency signal input end RFC of the electronic switch 14 is communicated with a main radio frequency signal output end RF1, and a radio frequency front end device of the multi-frequency receiver normally outputs; in the off state of the electronic switch 14, the main radio frequency signal input end RFC of the electronic switch 14 is communicated with the grounding end RF3, the main radio frequency signal output end RF1 is not output, namely, the radio frequency front end device of the multi-frequency receiver is disconnected, and the isolation protection effect is realized.
Based on all the above embodiments, the circuit principle of the rf front-end device of the multi-frequency receiver is described in detail below with reference to fig. 1 and 2:
as shown in fig. 1 and 2, when the multifrequency filter 27 receives weak radio frequency signals with a plurality of wavebands from the outside through the signal receiving end, the multifrequency filter 27 divides the signals into a plurality of mutually independent resonant cavities to be simultaneously processed and simultaneously output to the coupler 12, the coupler 12 outputs partial radio frequency signals of the signals to the detection circuit 11, and the other part of radio frequency signals flowing through the coupler 12 reach the signal strength which can be output through the limiting and amplifying actions of the limiting module 29 and the amplifying module 30; the preset threshold is signal intensity, and the size of the preset signal intensity threshold can be adjusted according to actual needs; after receiving the coupled output signals of the directional coupler 12, the detection circuit 11 detects the signal intensity of the signals, and if the signal intensity exceeds a preset signal intensity threshold value, the detection circuit 11 sends out a detection result signal; after receiving the detection result signal, the control circuit 13 controls the electronic switch 14 to be disconnected, so as to achieve the purpose of isolating the protection circuit; conversely, the electronic switch 14 is kept on, and the rf signal flowing through the limiter module 16 and the amplifier module 30 can be output through the electronic switch 14.
Wherein, the detection result signal is a direct current voltage quantity, and the specific action process is as follows:
(1) When the signal intensity exceeds a preset signal intensity threshold, the voltage of the output end of the detection circuit 11 is 3.5V-5V (high level); the voltage value of the first control output end Vout1 of the control circuit 13 is 3.5V-5V (high level), and the voltage value of the second control output end Vout2 of the control circuit 13 is 0V-0.7V (low level); the third diode D3, the fifth diode D5, the fourth diode D4 and the sixth diode D6 of the electronic switch 14 are turned off, and the ground terminal RF3 of the control circuit has an output.
(2) When the signal intensity is lower than a preset signal intensity threshold, the output voltage of the detection circuit 11 is 0V-0.7V; the voltage value of the first control output end Vout1 of the control circuit 13 is 0V-0.7V (low level), and the voltage value of the second control output end Vout2 of the control circuit 13 is 3.5V-5V (high level); the third diode D3, the fifth diode D5, the fourth diode D4 and the sixth diode D6 of the electronic switch 14 are turned off, and the main rf signal output end of the control circuit 13 outputs an rf signal.
The limiting module 29 and the amplifying module 30 are arranged in the radio frequency front-end device of the multi-frequency receiver, so that the basic function of the radio frequency front-end device of the multi-frequency receiver is guaranteed, then the functions of simultaneously processing radio frequency signals of a plurality of different wave bands and mutually independent are realized through the arrangement of the multi-frequency filter 27, the prior art is improved, and the device for realizing the functions is smaller in size than the existing radio frequency front-end device of the multi-frequency receiver and simple in structure. In addition, the signal detection module 28 and the signal isolation module 31 are arranged in the radio frequency front-end device of the multi-frequency receiver, so that the radio frequency signal intensity in the circuit can be detected under the condition of simultaneously processing a plurality of radio frequency signals, the radio frequency signal intensity is compared with a preset signal intensity threshold value, and when the radio frequency signal intensity exceeds the preset threshold value range, the signal isolation module plays a role in controlling the electronic switch to be disconnected, thereby achieving the purpose of protecting the circuit under the condition of simultaneously processing the radio frequency signals of a plurality of wave bands.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.
Claims (4)
1. The multi-frequency receiver radio frequency front-end device is characterized by comprising a signal receiving end, a multi-frequency filter, a signal detection module, a limiting module, a signal amplifying module, an isolating switch module and a signal output end;
the signal detection module comprises an input end, a first output end and a second output end; the isolating switch module comprises a first input end, a second input end and an output end; the input end of the multi-frequency filter is connected with the signal receiving end, and the output end of the multi-frequency filter is connected with the input end of the signal detection module; the first output end of the signal detection module is connected with the input end of the amplitude limiting module, and the second output end of the signal detection module is connected with the first input end of the isolating switch module; the output end of the amplitude limiting module is connected with the input end of the signal amplifying module; the output end of the signal amplification module is connected with the second input end of the isolating switch module; the output end of the isolating switch module is connected with the signal output end;
the multi-frequency filter is provided with a plurality of resonant filter cavities for filtering different wave bands and is used for simultaneously filtering the radio frequency signals of the different wave bands received by the signal receiving end;
the signal detection module is used for detecting the intensity of the radio frequency signal after the filtering treatment and sending the detection result to the isolating switch module;
the amplitude limiting module is used for carrying out amplitude limiting processing on the radio frequency signals subjected to the filtering processing;
the signal amplification module is used for amplifying the radio frequency signals subjected to amplitude limiting treatment;
the isolating switch module is used for switching off when the intensity of the radio frequency signal is greater than a protection threshold value so as to cut off the output of the signal amplifying module;
the signal detection module comprises a coupler and a detection circuit, wherein the coupler comprises a signal input port, a signal output port and a coupling output port; the signal input port of the coupler is connected with the output end of the multi-frequency filter; the signal output port of the coupler is connected with the input end of the amplitude limiting module; the coupling output port of the coupler is connected with the input end of the detection circuit; the output end of the detection circuit is connected with the first input port of the isolating switch module;
the coupler is used for separating detection signals from the radio frequency signals after the multi-frequency filter is used for filtering;
the detection circuit is used for detecting the detection signal separated by the coupler and outputting a detection result signal;
the detection circuit comprises an input terminal, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first detection chip and an enabling signal input end;
the first detection chip comprises a power supply pin, a positive input pin, a null pin, a negative input pin, a ground pin, an output pin, a first resistor pin, a second resistor pin, an enabling pin and a filtering pin; the input terminal is provided with an input end and a grounding end, the input end of the input terminal is the input end of the detection circuit, and the grounding end of the input terminal is grounded; the first end of the first capacitor, the first end of the second capacitor and the input end of the input terminal are interconnected, and the second end of the first capacitor is grounded; the second end of the second capacitor, the first end of the first resistor and the positive input pin of the first detection chip are interconnected; the second end of the first resistor, the first end of the third capacitor, the first end of the fourth capacitor and the negative input pin of the first detection chip are interconnected; the second end of the third capacitor and the second end of the fourth capacitor are grounded;
the first end of the second resistor is connected with a power supply, and the second end of the second resistor, the first end of the fifth capacitor, the first end of the sixth capacitor, the first end of the seventh capacitor and the power supply pin of the first detection chip are interconnected; the second end of the fifth capacitor is connected with the filtering pin of the first detection chip; the second end of the sixth capacitor and the second end of the seventh capacitor are grounded;
the first end of the third resistor is connected with the first resistor pin of the first control chip, and the second end of the third resistor is grounded; the first end of the fourth resistor is connected with the second resistor pin of the first control chip, and the second end of the fourth resistor is grounded; the first end of the fifth resistor, the enabling pin of the first control chip and the enabling signal input end are interconnected, and the second end of the fifth resistor is grounded; the first end of the eighth capacitor is connected with the output pin of the first control chip, and the second end of the eighth capacitor is grounded; the output pin of the first control chip is an output port of the detection circuit;
the limiting module comprises a first diode and a second diode, the positive electrode of the first diode is the output end of the limiting module, and the negative electrode of the first diode is connected with the positive electrode of the second diode; the positive electrode of the second diode is grounded, the negative electrode of the second diode is connected with the positive electrode of the first diode, and the negative electrode of the second diode is the output end of the amplitude limiting module.
2. The rf front-end device of claim 1, wherein the isolation switch module includes an electronic switch and a control circuit, the electronic switch includes a first input terminal, a second input terminal, and an output terminal, the first input terminal of the electronic switch is connected to the output terminal of the signal amplifying module, the second input terminal of the electronic switch is connected to the output terminal of the control circuit, and the output terminal of the electronic switch is the output terminal of the isolation switch module; the input end of the control circuit is connected with the output end of the detection circuit;
the control circuit is used for receiving a detection result signal of the detection circuit, comparing a voltage value corresponding to the detection result signal with a voltage protection threshold value, and outputting a switch control signal to control the electronic switch to be disconnected when the voltage value corresponding to the detection result signal is greater than or equal to the voltage protection threshold value.
3. The multi-frequency receiver radio frequency front-end device of claim 2, wherein the control circuit comprises a first signal input, a first control signal output, a second control signal output, a sixth resistor, a seventh resistor, an eighth resistor, a first amplifier, and a second amplifier, the first end of the sixth resistor being connected to a power supply, the second end of the sixth resistor, the first end of the seventh resistor, and the positive input of the first amplifier being interconnected; the second end of the seventh resistor, the first end of the eighth resistor and the positive electrode input end of the second amplifier are interconnected; the second end of the eighth resistor is grounded; the negative electrode input end of the first amplifier is connected with the negative electrode input end of the second amplifier and is a first signal input end of the control circuit, and the output end of the first amplifier is a first control signal output end of the control circuit; the output end of the second amplifier is a second control signal output end of the control circuit.
4. The multi-frequency receiver rf front-end device of claim 3, wherein the electronic switch comprises a ninth capacitance, a tenth capacitance, an eleventh capacitance, a twelfth capacitance, a thirteenth capacitance, a fourteenth capacitance, a fifteenth capacitance, a sixteenth capacitance, a seventeenth capacitance, an eighteenth capacitance, a first inductance, a second inductance, a third inductance, a fourth inductance, a fifth inductance, a ninth resistance, a tenth resistance, an eleventh resistance, a third diode, a fourth diode, a fifth diode, and a sixth diode; the first end of the ninth capacitor is connected with the output end of the signal amplifying module, and the second end of the ninth capacitor, the anode of the third diode, the anode of the fourth diode and the first end of the first inductor are interconnected; the first end of the tenth capacitor is an output end of the electronic switch module, and the second end of the tenth capacitor, the negative electrode of the third diode, the positive electrode of the fifth diode and the first end of the second inductor are interconnected; a first end of the eleventh capacitor, a negative electrode of the fifth diode and a first end of the fourth inductor are interconnected, and a second end of the eleventh capacitor is grounded; the first end of the twelfth capacitor is grounded, and the second end of the twelfth capacitor, the first end of the third inductor, the negative electrode of the fourth diode and the positive electrode of the sixth diode are interconnected; a first end of the thirteenth capacitor, a cathode of the sixth diode and a first end of the fifth inductor are interconnected, and a second end of the thirteenth capacitor is grounded;
a second end of the first inductor, a first end of the fourteenth capacitor and a first end of the ninth resistor are interconnected; the second end of the ninth resistor is connected with a power supply; the second end of the fourteenth capacitor is grounded;
the second end of the second inductor, the first end of the fifteenth capacitor and the first control signal output end of the control circuit are connected with each other; the second end of the fifteenth capacitor is grounded;
the second end of the third inductor, the first end of the sixteenth capacitor and the second control signal output end of the control circuit are interconnected; the second end of the sixteenth capacitor is grounded;
a second end of the fourth inductor, a first end of the tenth resistor and a first end of the seventeenth capacitor are interconnected; the second end of the tenth resistor is grounded; the second end of the seventeenth capacitor is grounded;
a second end of the fifth inductor, a first end of the eleventh resistor and a first end of the eighteenth capacitor are interconnected; the second end of the eleventh resistor is grounded; the second end of the eighteenth capacitor is grounded.
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| CN112114202B (en) * | 2019-07-12 | 2021-07-23 | 中兴通讯股份有限公司 | Device for detecting SAR, method for reducing SAR and mobile terminal |
| 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 |
| CN113824416B (en) * | 2021-09-08 | 2023-07-18 | 西安电子科技大学 | Semi-active full-detection type amplitude limiting circuit |
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| TWI320638B (en) * | 2006-08-11 | 2010-02-11 | Benq Corp | Transceiver of radio frequency signal capable of enhancing performance of transmission and reception of a mobile communication device |
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| CN203574616U (en) * | 2013-11-22 | 2014-04-30 | 宁波杉工结构监测与控制工程中心有限公司 | Multichannel low-pass filter with adjustable cut-off frequency and gain |
| CN204216595U (en) * | 2014-07-30 | 2015-03-18 | 广东高标电子科技有限公司 | Radio-frequency (RF) receiving circuit and electric motor car |
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