Multi-mode signal processing circuit

Abstract

The invention relates to the technical field of signal processing, and discloses a multi-mode signal processing circuit, which detects the intensity of a radio-frequency signal when the radio-frequency signal is received, and then performs signal processing according to the result of the detected signal intensity. And the control module outputs corresponding control signals to control radio frequency branches with different signal strengths in the communication link module to access the circuit so as to process the radio frequency signals, so that the radio frequency signals under the high-input dynamic condition can be quickly processed without depending on negative feedback, the radio frequency signals meet the next-level input signal condition, and the signal quality is improved. The technical problem that in the prior art, a multi-mode signal processing circuit cannot meet signal processing under the high input dynamic condition is solved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of radio frequency communication technology, and in particular to a multi-mode signal processing circuit. Background Art

[0002] With the continuous development of current wireless communication technology, wireless communication technology can be used to achieve wireless transmission of data such as sound and images. The front end of the wireless communication receiving link usually needs to process the RF signal received by the antenna. The processed received signal enters the next-level receiver module through the RF link. The processed signal is down-converted and outputs the intermediate frequency signal. The intermediate frequency signal undergoes a series of processing to obtain the information of the received signal. Since the transmission of signals in space in wireless communication will be affected by factors such as distance, obstacles, and weather, the size of the signal received by the antenna is also different. Therefore, the received signal needs to be processed before it can be further applied by the receiver.

[0003] At the same time, with the widespread application of wireless communications, there will be certain interference between signals in different frequency bands. When the receiving antenna receives an interference signal with similar characteristics to the useful signal, the receiver under the conventional architecture will be unable to perform subsequent signal processing due to the interference signal. When the useful signal received by the antenna is relatively weak, it will make it impossible to demodulate the useful signal. At this time, the strength of the useful signal needs to be regulated to meet the input signal conditions of the receiver module.

[0004] The existing signal processing modules usually use negative feedback networks to adjust the signals on the receiving channel. There are certain limitations in the processing of signals on the channel, and they cannot simultaneously meet the signal processing requirements under high input dynamic conditions. Summary of the invention

[0005] In view of the above problems, an embodiment of the present invention provides a multi-mode signal processing circuit, which is used to solve the technical problem that the multi-mode signal processing circuit in the prior art cannot meet the signal processing requirements under high input dynamic conditions.

[0006] According to one aspect of an embodiment of the present invention, there is provided a multi-mode signal processing circuit, comprising:

[0007] A radio frequency signal input terminal, used for acquiring a radio frequency signal;

[0008] RF signal output terminal;

[0009] A power detection module, connected to the RF signal input terminal, configured to detect the signal strength of the RF signal and output the RF signal after preliminary processing;

[0010] A control module, connected to the power detection module, and outputting a corresponding control signal according to the signal strength;

[0011] A communication link module includes a plurality of RF branches for performing different signal processing and corresponding switching branches, the communication link module is respectively connected to the control module, the RF signal input terminal and the RF signal output terminal, and is used to switch the switching branch according to the control signal, connect the RF branch corresponding to the control signal between the RF signal input terminal and the RF signal output terminal, so as to quickly process the RF signal under high input dynamic conditions. The signal processing includes any one or more of direct pass, amplification, attenuation and grounding.

[0012] In an optional manner, the communication link module includes a first switching switch branch, a second switching switch branch, a third switching switch branch, a first RF branch, a second RF branch, a third RF branch and a fourth RF branch, the first switching switch branch has a controlled end, an input end, a first output end, a second output end, a third output end and a fourth output end, the second switching switch branch includes a controlled end, a first input end, a second input end and an output end, the third switching switch branch includes a controlled end, a first input end, a second input end and an output end, the power detection module has an input end, an output end and a detection signal output end, the control module includes a detection end, a first switching signal output end, a second switching signal output end and a third switching signal output end, the input end of the power detection module is connected to the RF signal input end, the detection signal output end of the power detection module is connected to the detection end of the control module, and the detection signal output end of the power detection module is connected to the detection end of the control module; the first switching signal output end of the control module is connected to the controlled end of the first switching switch branch. The first switching switch branch is connected to the controlled end of the second switching switch branch, the second switching signal output end of the control module is connected to the controlled end of the second switching switch branch, and the third switching signal output end of the control module is connected to the controlled end of the third switching switch branch; the first output end of the first switching switch branch is connected to the input end of the first RF branch, the second output end of the first switching switch branch is connected to the input end of the second RF branch, the third output end of the first switching switch branch is connected to the input end of the third RF branch, and the fourth output end of the first switching switch branch is grounded; the first input end of the second switching switch branch is connected to the output end of the first RF branch, the second input end of the second switching switch branch is connected to the output end of the fourth RF branch, and the output end of the second switching switch branch is connected to the RF signal output end; the first input end of the third switching switch branch is connected to the output end of the second RF branch, the second input end of the third switching switch branch is connected to the output end of the third RF branch, and the output end of the third switching switch branch is connected to the input end of the fourth RF branch.

[0013] In an optional manner, the first radio frequency branch constitutes a direct path;

[0014] The second radio frequency branch and the fourth radio frequency branch form an amplification attenuation path;

[0015] The third radio frequency branch and the fourth radio frequency branch form a limiting attenuation path;

[0016] The fourth output terminal of the first switch branch is grounded to form a ground path.

[0017] In an optional manner, the power detection module includes a directional coupler, a power detector and an analog-to-digital converter, the input end of the directional coupler is connected to the radio frequency signal, the output end of the directional coupler outputs the radio frequency signal after preliminary processing, the input end of the power detector is connected to the detection end of the directional coupler, the input end of the analog-to-digital converter is connected to the output end of the power detector, and the analog-to-digital converter outputs a digital signal corresponding to the detected radio frequency signal to the control module;

[0018] The directional coupler is used to perform preliminary coupling processing on the radio frequency signal and obtain the radio frequency signal for detection;

[0019] The power detector is used to detect the signal strength of the radio frequency signal and output a corresponding analog signal;

[0020] The analog-to-digital converter is used to convert the analog signal into a digital signal.

[0021] In an optional manner, the multi-mode signal processing circuit further includes a display module, and the display module is connected to the control module;

[0022] The control module is used to output a status control signal and an information display signal;

[0023] The display module is used to display the circuit status according to the status control signal and the information display signal.

[0024] In an optional manner, the first radio frequency branch is a direct branch, and is composed of a radio frequency line.

[0025] In an optional manner, the second RF branch includes an adjustable amplifier, the control module also includes an amplification control signal output end, the controlled end of the adjustable amplifier is connected to the amplification control signal output end of the control module, the input end of the adjustable amplifier is the input end of the second RF branch, and the output end of the adjustable amplifier is the output end of the second RF branch.

[0026] In an optional manner, the third radio frequency branch includes a limiter, an input end of the limiter is an input end of the third radio frequency branch, and an output end of the limiter is an output end of the third radio frequency branch.

[0027] In an optional manner, the fourth RF branch includes an adjustable attenuator, and the control module also includes an attenuation control signal output end. The controlled end of the adjustable attenuator is connected to the attenuation control signal output end of the control module, the input end of the adjustable attenuator is the input end of the fourth RF branch, and the output end of the adjustable attenuator is the output end of the fourth RF branch.

[0028] In an optional manner, the first switch branch is a single-pole four-throw switch.

[0029] In an optional manner, the second switch branch and the third switch branch are single-pole double-throw switches.

[0030] The present invention detects the signal strength of the radio frequency signal when the radio frequency signal is received, and then, based on the result of the detected signal strength, the control module outputs a control signal to control the radio frequency branch access circuit corresponding to different signal strengths in the communication link module to process the radio frequency signal. In this way, the radio frequency signal with high input dynamic conditions can be quickly processed without relying on negative feedback, so that it meets the input signal conditions of the next level, thereby solving the technical problem in the prior art that the multi-mode signal processing circuit cannot meet the signal processing requirements under high input dynamic conditions.

[0031] The above description is only an overview of the technical solution of the embodiment of the present invention. In order to more clearly understand the technical means of the embodiment of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the embodiment of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings are only used to illustrate the embodiments and are not to be considered as limiting the present invention. In addition, the same reference symbols are used to represent the same components throughout the accompanying drawings. In the accompanying drawings:

[0033] Figure 1 A schematic diagram of a module of a multi-mode signal processing circuit provided by the present invention is shown;

[0034] Figure 2 The figure shows a circuit diagram of a multi-mode signal processing circuit provided by the present invention. DETAILED DESCRIPTION

[0035] Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein.

[0036] The present application proposes a multi-mode signal processing circuit, which is used to solve the technical problem that the multi-mode signal processing circuit in the prior art cannot meet the signal processing requirements under high input dynamic conditions.

[0037] In an alternative embodiment, referring to Figure 1 As shown, a multi-mode signal processing circuit includes a radio frequency signal input terminal RF_IN, a radio frequency signal output terminal RF_OUT, a power detection module A, a control module C and a communication link module B, wherein the power detection module A is connected to the radio frequency signal input terminal RF_IN, and the control module C is connected to the power detection module A. The communication link module B includes a plurality of radio frequency branches that perform different signal processing and corresponding switching branches, and the communication link module B is respectively connected to the control module C, the radio frequency signal input terminal RF_IN and the radio frequency signal output terminal RF_OUT.

[0038] Among them, the RF signal input terminal RF_IN obtains the RF signal, the power detection module A detects the signal strength of the RF signal, and outputs the RF signal after preliminary processing. The control module C outputs the corresponding control signal according to the signal strength. The communication link module B switches the branch according to the control signal, and connects the RF branch corresponding to the control signal between the RF signal input terminal RF_IN and the RF signal output terminal RF_OUT to quickly process the RF signal under high input dynamic conditions. Among them, the signal processing includes any one of direct pass, amplification, attenuation, and grounding.

[0039] In the above embodiment, when the RF signal is received, the signal strength of the RF signal is detected, and then according to the result of the detected signal strength, the control module C outputs a control signal to control the RF branch access circuit corresponding to different signal strengths in the communication link module B to process the RF signal, thereby completing the rapid processing of the RF signal under high input dynamic conditions without relying on negative feedback, so that it meets the input signal conditions of the next level, thereby solving the technical problem in the prior art that the multi-mode signal processing circuit cannot meet the signal processing requirements under high input dynamic conditions.

[0040] In an alternative embodiment, referring to Figure 2As shown, the communication link module B includes a first switch branch B4, a second switch branch B5, a third switch branch B6, a first RF branch, a second RF branch B1, a third RF branch B2 and a fourth RF branch B3, the first switch branch B4 has a controlled end, an input end, a first output end, a second output end, a third output end and a fourth output end, the second switch branch B5 includes a controlled end, a first input end, a second input end and an output end, the third switch branch B6 includes a controlled end, a first input end, a second input end and an output end The power detection module A has an input end, an output end and a detection signal output end. The control module C includes a detection end, a first switching signal output end, a second switching signal output end and a third switching signal output end. The input end of the power detection module A is connected to the RF signal input end RF_IN, the detection signal output end of the power detection module A is connected to the detection end of the control module C, and the detection signal output end of the power detection module A is connected to the detection end of the control module C; the first switching signal output end of the control module C is connected to the controlled end of the first switching switch branch B4, the second switching signal output end of the control module C is connected to the controlled end of the second switching switch branch B5, and the third switching signal output end of the control module C is connected to the controlled end of the third switching switch branch; the first output end of the first switching switch branch B4 is connected to the input end of the first RF branch, the second output end of the first switching switch branch B4 is connected to the input end of the second RF branch B1, the third output end of the first switching switch branch B4 is connected to the input end of the third RF branch B2, and the fourth output end of the first switching switch branch B4 is grounded; the second The first input end of the switching switch branch B5 is connected to the output end of the first RF branch, the second input end of the second switching switch branch B5 is connected to the output end of the fourth RF branch B3, and the output end of the second switching switch branch B5 is connected to the RF signal output end RF_OUT; the first input end of the third switching switch branch B6 is connected to the output end of the second RF branch B1, the second input end of the third switching switch branch B6 is connected to the output end of the third RF branch B2, and the output end of the third switching switch branch B6 is connected to the input end of the fourth RF branch B3.

[0041] In the above circuit, the switching of different processing functions is achieved by switching the switch paths of the first switch branch B4, the second switch branch B5, and the third switch branch B6, for example:

[0042] In the first case, refer to Figure 2 As shown, the first switch branch B4 and the second switch branch B5 are controlled so that the first RF branch is connected between the RF signal input terminal RF_IN and the RF signal output terminal RF_OUT. At this time, the first RF branch constitutes a direct path.

[0043] In the second case, the first switching switch branch B4, the second switching switch branch B5 and the third switching switch branch B6 are controlled so that the second RF branch B1 and the fourth RF branch B3 are connected between the RF signal input terminal RF_IN and the RF signal output terminal RF_OUT. At this time, the second RF branch B1 and the fourth RF branch B3 constitute an amplification attenuation path.

[0044] In the third case, the first switching switch branch B4, the second switching switch branch B5 and the third switching switch branch B6 are controlled so that the third RF branch B2 and the fourth RF branch B3 are connected between the RF signal input terminal RF_IN and the RF signal output terminal RF_OUT. At this time, the third RF branch B2 and the fourth RF branch B3 constitute a limiting attenuation path.

[0045] In the fourth case, the first switch branch B4 is controlled so that the fourth output terminal of the first switch branch B4 is grounded to form a ground path.

[0046] Through the switching schemes of the above-mentioned multiple switches, different paths can be connected, so that the connected signals can be directly and quickly processed.

[0047] Optionally, the control module C can use an FPGA chip to read ADC data and output a control level signal, and communicate with the outside through a standard RS232 serial port.

[0048] In an alternative embodiment, referring to Figure 2 As shown, the power detection module A includes a directional coupler, a power detector and an analog-to-digital converter. The input end of the directional coupler is connected to the RF signal, and the output end of the directional coupler outputs the RF signal after preliminary processing. The input end of the power detector is connected to the detection end of the directional coupler, and the input end of the analog-to-digital converter is connected to the output end of the power detector. The analog-to-digital converter outputs a digital signal corresponding to the detected RF signal to the control module C.

[0049] The directional coupler performs preliminary coupling processing on the RF signal and obtains the RF signal for detection. The power detector detects the signal strength of the RF signal and outputs the corresponding analog signal, and the analog-to-digital converter converts the analog signal into a digital signal.

[0050] Furthermore, the directional coupler can be a directional coupler with a coupling degree of 20 dB. The power detector uses a self-developed power detector or other power detectors. The post-stage of the power detector uses a 12-bit ADC to convert the analog signal outputted by the power detector.

[0051] In an alternative embodiment, referring to Figure 2 As shown, the first radio frequency branch is a straight-through branch, which is composed of a radio frequency line.

[0052] In an alternative embodiment, referring to Figure 2 As shown, the second RF branch B1 includes an adjustable amplifier LNA_E, the control module also includes an amplification control signal output end, the controlled end of the adjustable amplifier LNA_E is connected to the amplification control signal output end of the control module, the input end of the adjustable amplifier LNA_E is the input end of the second RF branch B1, and the output end of the adjustable amplifier LNA_E is the output end of the second RF branch B1.

[0053] At this time, the adjustable amplifier LNA_E means that the specific parameters are adjustable and can be adjusted in a variety of ways such as programmable, pre-set or manual. The adjustable amplifier LNA_E is a low noise amplifier with an enable terminal. Under the control of the enable signal, the low noise amplifier realizes two modes, namely amplification and non-operating. In the non-operating state, it has lower power consumption. For example, the adjustable amplifier LNA_E can select an amplifier with an enable control port, and the typical gain value is 20dB.

[0054] In an alternative embodiment, referring to Figure 2 As shown, the third RF branch B2 includes a limiter LIM, an input end of the limiter LIM is an input end of the third RF branch B2, and an output end of the limiter LIM is an output end of the third RF branch B2.

[0055] At this time, the limiter LIM uses a self-developed diode limiter with a typical limiting threshold of +12dBm and a maximum input power of 30dBm.

[0056] In an alternative embodiment, referring to Figure 2 As shown, the fourth RF branch B3 includes an adjustable attenuator ATT_D, and the control module also includes an attenuation control signal output end. The controlled end of the adjustable attenuator ATT_D is connected to the attenuation control signal output end of the control module, the input end of the adjustable attenuator ATT_D is the input end of the fourth RF branch B3, and the output end of the adjustable attenuator ATT_D is the output end of the fourth RF branch B3.

[0057] At this time, the adjustable attenuator ATT_D means that the specific parameters are adjustable and can be adjusted in various ways such as programmable, pre-set or manual. The adjustable attenuator ATT_D uses a gallium arsenide 6-bit parallel digital attenuator with an attenuation step of 0.5dB and a maximum attenuation value of 31.5dB, which can adjust the signal size on the link.

[0058] In the above embodiments, programmable means that the designed control scheme is stored in the form of a program in the storage module corresponding to the FPGA. After the module is powered on, the FPGA automatically reads the control program to realize the detection, automatic control and processing of the input signal.

[0059] The multi-mode signal processing module can realize multiple operation modes, namely programmable automatic control mode, automatic setting control mode and manual control mode.

[0060] The programmable automatic control mode is to store the designed control scheme in the form of a program in the storage module corresponding to the FPGA. After the module is powered on, the FPGA automatically reads the control program to realize the detection, automatic control and processing of the input signal.

[0061] The control mode is automatically set. The output signal value required by the external input is calculated by module C according to the current signal detection result and gives a reasonable control state.

[0062] Manual mode can be used for individual control and debugging, and control data can be sent from the outside through the RS232 interface to achieve module status control and provide data for subsequent adjustment of automatic control programs.

[0063] Optionally, the first switch branch B4 is a single-pole four-throw switch SP4T.

[0064] The single-pole four-throw switch SP4T uses SOI technology chips, with a maximum input signal of +42dBm and high-power signal processing capabilities.

[0065] Optionally, the second switch branch B5 and the third switch branch are single-pole double-throw switches. The single-pole double-throw switch SPDT1 of the third switch branch adopts a single-pole double-throw switch designed based on GaAs process, with a channel insertion loss of 0.4dB and a maximum input power of 30dBm. The single-pole double-throw switch SPDT2 of the second switch branch B5 adopts the same chip as SPDT1 to realize the switching of RF channel 1 and RF channel 2 in module B.

[0066] Optionally, the multi-mode signal processing circuit further includes a display module, and the display module is connected to the control module C.

[0067] The control module C outputs a state control signal and an information display signal, and the display module displays the circuit state according to the state control signal and the information display signal. The display module can display the current working state in real time, and can display the current input power, channel and control state, and the estimated size of the RF_OUT port output signal in the LED display module.

[0068] The following combination Figure 1-Figure 2 The working principle of the invention is described as follows:

[0069] When the power of the RF signal received by the RF signal input terminal RF_IN is greater than 30dBm, the input signal exceeds the maximum input power of the adjustable limiter LIM, the components in the module will be damaged, and the control module C switches the single-pole four-throw switch SP4T to the grounded channel 4, realizing the module protection function.

[0070] When the power of the RF signal received by the RF signal input terminal RF_IN is greater than 12dBm, the control module C controls the third RF branch B2 and the fourth RF branch B3 of the communication link module B to form a channel 3 between the RF signal input terminal RF_IN and the RF signal output terminal RF_OUT to achieve limiting and attenuation of the transmission signal.

[0071] When the power of the RF signal received by the RF signal input terminal RF_IN is close to the power requirement of the RF signal to be output by the RF signal output terminal RF_OUT, the control module C connects the first RF branch in the communication link module B to form channel 1 between the RF signal input terminal RF_IN and the RF signal output terminal RF_OUT to realize direct transmission of the signal.

[0072] When the power of the RF signal received by the RF signal input terminal RF_IN is small, the control module C connects the second RF branch B1 and the fourth RF branch B3 in the communication link module B to form a channel 2 between the RF signal input terminal RF_IN and the RF signal output terminal RF_OUT to realize the gain control function of the transmission signal.

[0073] The above invention realizes a multi-mode signal processing circuit that can be applied to radio frequency communication systems, which can realize automatic control of input signals and includes multiple working modes and signal processing functions, which can meet the application of radio frequency communication systems.

[0074] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. Similarly, in order to simplify the present invention and help understand one or more of the various inventive aspects, in the above description of exemplary embodiments of the present invention, the various features of the embodiments of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof. Wherein, the claims that follow the specific embodiment are hereby expressly incorporated into the specific embodiment, wherein each claim itself is a separate embodiment of the present invention.

[0075] Those skilled in the art will appreciate that the modules in the devices in the embodiments may be adaptively changed and arranged in one or more devices different from the embodiments. The modules or units or components in the embodiments may be combined into one module or unit or component, and further may be divided into a plurality of submodules or subunits or subcomponents. Except that at least some of such features and / or processes or units are mutually exclusive.

[0076] It should be noted that the above embodiments illustrate the present invention rather than limit it, and that those skilled in the art may devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets shall not be construed as a limitation on the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "one" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present invention may be implemented by means of hardware comprising a number of different elements and by means of a suitably programmed computer. In a unit claim enumerating a number of devices, several of these devices may be embodied by the same hardware item. The use of the words first, second, and third, etc. does not indicate any order. These words may be interpreted as names. The steps in the above embodiments, unless otherwise specified, should not be understood as limitations on the order of execution.

Claims

1. A multi-mode signal processing circuit, characterized in that: include: A radio frequency signal input terminal, used for acquiring a radio frequency signal; RF signal output terminal; A power detection module, connected to the RF signal input terminal, configured to detect the signal strength of the RF signal and output the RF signal after preliminary processing; A control module, connected to the power detection module, and outputting a corresponding control signal according to the signal strength; A communication link module comprises a plurality of RF branches and corresponding switching branches, wherein the communication link module is respectively connected to the control module, the RF signal input terminal and the RF signal output terminal, and is used to switch the switching branch according to the control signal, and connect the RF branch corresponding to the control signal between the RF signal input terminal and the RF signal output terminal, so as to quickly perform signal processing on the RF signal under high input dynamic conditions, wherein the signal processing includes any one of pass-through, amplification, attenuation and grounding.

2. The multi-mode signal processing circuit according to claim 1, characterized in that: The communication link module includes a first switch branch, a second switch branch, a third switch branch, a first RF branch, a second RF branch, a third RF branch and a fourth RF branch. The first switch branch has a controlled end, an input end, a first output end, a second output end, a third output end and a fourth output end. The second switch branch includes a controlled end, a first input end, a second input end and an output end. The third switch branch includes a controlled end, a first input end, a second input end and an output end. The power detection module has an input end, an output end and a detection signal output end. The control module includes a detection end, a first switching signal output end, a second switching signal output end and a third switching signal output end. The input end of the power detection module is connected to the RF signal input end, the detection signal output end of the power detection module is connected to the detection end of the control module, and the detection signal output end of the power detection module is connected to the detection end of the control module. The first switching signal output end of the control module is connected to the controlled end of the first switch branch. The second switching signal output end of the control module is connected to the controlled end of the second switching switch branch, and the third switching signal output end of the control module is connected to the controlled end of the third switching switch branch; the first output end of the first switching switch branch is connected to the input end of the first RF branch, the second output end of the first switching switch branch is connected to the input end of the second RF branch, the third output end of the first switching switch branch is connected to the input end of the third RF branch, and the fourth output end of the first switching switch branch is grounded; the first input end of the second switching switch branch is connected to the output end of the first RF branch, the second input end of the second switching switch branch is connected to the output end of the fourth RF branch, and the output end of the second switching switch branch is connected to the RF signal output end; the first input end of the third switching switch branch is connected to the output end of the second RF branch, the second input end of the third switching switch branch is connected to the output end of the third RF branch, and the output end of the third switching switch branch is connected to the input end of the fourth RF branch.

3. The multi-mode signal processing circuit according to claim 2, characterized in that: The first radio frequency branch constitutes a direct path; The second radio frequency branch and the fourth radio frequency branch form an amplification attenuation path; The third radio frequency branch and the fourth radio frequency branch form a limiting attenuation path; The fourth output terminal of the first switch branch is grounded to form a ground path.

4. The multi-mode signal processing circuit according to claim 1, characterized in that: The power detection module includes a directional coupler, a power detector and an analog-to-digital converter, the input end of the directional coupler is connected to the radio frequency signal, the output end of the directional coupler outputs the radio frequency signal after preliminary processing, the input end of the power detector is connected to the detection end of the directional coupler, the input end of the analog-to-digital converter is connected to the output end of the power detector, and the analog-to-digital converter outputs a digital signal corresponding to the detected radio frequency signal to the control module; The directional coupler is used to perform preliminary coupling processing on the radio frequency signal and obtain the radio frequency signal for detection; The power detector is used to detect the signal strength of the radio frequency signal and output a corresponding analog signal; The analog-to-digital converter is used to convert the analog signal into a digital signal.

5. The multi-mode signal processing circuit according to claim 1, characterized in that: The multi-mode signal processing circuit further includes a display module, and the display module is connected to the control module; The control module is used to output a status control signal and an information display signal; The display module is used to display the circuit status according to the status control signal and the information display signal.

6. The multi-mode signal processing circuit according to claim 2, characterized in that: The second RF branch includes an adjustable amplifier, and the control module also includes an amplification control signal output end. The controlled end of the adjustable amplifier is connected to the amplification control signal output end of the control module. The input end of the adjustable amplifier is the input end of the second RF branch, and the output end of the adjustable amplifier is the output end of the second RF branch.

7. The multi-mode signal processing circuit according to claim 2, characterized in that: The third radio frequency branch includes a limiter, an input end of the limiter is an input end of the third radio frequency branch, and an output end of the limiter is an output end of the third radio frequency branch.

8. The multi-mode signal processing circuit according to claim 2, characterized in that: The fourth RF branch includes an adjustable attenuator, and the control module also includes an attenuation control signal output end. The controlled end of the adjustable attenuator is connected to the attenuation control signal output end of the control module, the input end of the adjustable attenuator is the input end of the fourth RF branch, and the output end of the adjustable attenuator is the output end of the fourth RF branch.

9. The multi-mode signal processing circuit according to claim 2, characterized in that: The first switch branch is a single-pole four-throw switch.

10. The multi-mode signal processing circuit according to claim 2, wherein: The second switch branch and the third switch branch are both single-pole double-throw switches.

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