A signal detection circuit and a signal detection device

Abstract

This application is applicable to the field of electronic technology, and provides a signal detection circuit and a signal detection device, including: when the control module detects a detection request, it sends a first control signal to the signal acquisition module and a second control signal to the switch module; so that the signal acquisition module acquires a preset radio frequency signal, and sends the preset radio frequency signal to the device under test through the first connection path connected by the switch module; the device under test generates a second harmonic based on the preset radio frequency signal, and sends the second harmonic to the signal detection module through the second connection path connected by the switch module, so that the signal detection module determines the voltage signal corresponding to the second harmonic; finally, the control module determines the target power corresponding to the second harmonic according to the voltage signal and the preset voltage power meter. The signal detection circuit provided by this application can detect the power of the second harmonic without using a dedicated signal test instrument, reducing the test cost.

Description

Technical Field

[0001] This application belongs to the field of electronic technology, and particularly relates to a signal detection circuit and a signal detection device. Background Art

[0002] Currently, when a certain device includes modulation and demodulation of binary amplitude shift keying (OOK) signals during use, it is usually necessary to test the radio frequency indicators of the second harmonic generated by the above OOK signals to determine the performance of the device.

[0003] However, the prior art usually needs to connect the above device to a signal test instrument (such as a spectrum analyzer, etc.), and detect the radio frequency indicators (such as power) of the second harmonic generated by the above OOK signals through the signal test instrument. Since the prior art requires the use of a dedicated signal test instrument, the test cost is increased. Summary of the Invention

[0004] In view of this, the embodiments of this application provide a signal detection circuit and a signal detection device to solve the technical problem in the prior art that a dedicated signal test instrument needs to be used to detect the radio frequency indicators (such as power) of the second harmonic, thereby increasing the test cost.

[0005] The embodiments of this application provide a signal detection circuit, which is arranged in a signal detection device. The signal detection circuit is used to connect to a device under test; the signal detection circuit includes:

[0006] A control module, connected to a signal acquisition module and a switch module. The control module is used to send a first control signal to the signal acquisition module and a second control signal to the switch module when a detection request is detected;

[0007] The signal acquisition module is used to acquire a preset radio frequency signal when receiving the first control signal;

[0008] The switch module is connected to the control module, the signal acquisition module, a signal detection module and the device under test. The switch module is used to connect a first connection path between the signal acquisition module and the device under test and a second connection path between the device under test and the signal detection module when receiving the second control signal, so that the signal acquisition module sends the preset radio frequency signal to the device under test through the first connection path, and the device under test sends the second harmonic generated based on the preset radio frequency signal to the signal detection module through the second connection path;

[0009] The signal detection module is connected to the control module and is used to determine the voltage signal corresponding to the second harmonic and send the voltage signal to the control module.

[0010] The control module is further configured to determine the target power corresponding to the second harmonic according to the voltage signal and a preset voltage power table.

[0011] Optionally, the signal detection circuit further includes a signal generation module and a signal adjustment module; the signal adjustment module is connected to the control module and the signal generation module;

[0012] The control module is further connected to the signal generation module, and the control module is further configured to send a third control signal to the signal generation module and a fourth control signal to the switch module when a calibration request is detected;

[0013] The signal generation module is configured to generate a first radio frequency signal when receiving the third control signal;

[0014] The switch module is further configured to connect a third connection path between the signal generation module and the signal detection module when receiving the fourth control signal, so that the signal generation module sends the first radio frequency signal to the signal detection module through the third connection path;

[0015] The signal detection module is further configured to determine an actual voltage signal corresponding to the first radio frequency signal and send the actual voltage signal to the control module;

[0016] The control module is further connected to the signal adjustment module, and the control module is further configured to send a fifth control signal to the signal adjustment module when a difference between a voltage value of the actual voltage signal and a preset voltage threshold is greater than a difference threshold;

[0017] The signal adjustment module is configured to adjust the first radio frequency signal by adjusting a resistance value of the signal adjustment module when receiving the fifth control signal until the first radio frequency signal becomes the preset radio frequency signal;

[0018] The signal acquisition module is further connected to the signal generation module, and the signal acquisition module is specifically configured to acquire the preset radio frequency signal from the signal generation module.

[0019] Optionally, the control module is further connected to a first signal source, the signal detection circuit further includes a storage module, and the storage module is connected to the control module;

[0020] The control module is further configured to acquire the preset radio frequency signal from the first signal source, determine a preset voltage signal corresponding to the preset radio frequency signal, and send the preset radio frequency signal and the preset voltage signal to the storage module; wherein, the preset radio frequency signal carries a preset power corresponding to the preset radio frequency signal.

[0021] The storage module is configured to store the preset voltage signal and the preset power in association in the preset voltage-power table.

[0022] Optionally, the signal detection circuit further includes a display module; the display module is connected to the control module;

[0023] The control module is further configured to send the target power to the display module;

[0024] The display module is configured to display the target power.

[0025] Optionally, the switch module includes three switch units; the three switch units are all connected to the control module;

[0026] The three switch units are configured to control the on / off states of the first connection path, the second connection path, and the third connection path.

[0027] Optionally, the signal generation module includes a signal generation chip, a first operational amplifier, a first inductance coil, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, and a seventh capacitor;

[0028] The first end of the first resistor and the input end of the signal generation chip are commonly connected and serve as the input end of the signal generation module. The second end of the first resistor is grounded. The output end of the signal generation chip is connected to the first end of the second resistor. The second end of the second resistor is connected to the first end of the third resistor. The second end of the third resistor and the first end of the fourth resistor are commonly connected to the first end of the first capacitor. The second end of the fourth resistor is grounded. The second end of the first capacitor and the first end of the fifth resistor are commonly connected to the first end of the sixth resistor. The second end of the fifth resistor is grounded. The second end of the sixth resistor and the first end of the seventh resistor are commonly connected to the first end of the second capacitor. The second end of the seventh resistor is grounded. The second end of the second capacitor is connected to the first end of the eighth resistor. The second end of the eighth resistor and the first end of the ninth resistor are commonly connected to the inverting input end of the first operational amplifier. The second end of the ninth resistor and the first end of the third capacitor are commonly connected to the output end of the first operational amplifier. The second end of the third capacitor is connected to the first end of the tenth resistor. The second end of the tenth resistor is connected to the first end of the eleventh resistor. The second end of the eleventh resistor serves as the output end of the signal generation module. The first end of the twelfth resistor, the first end of the fourth capacitor, and the first end of the thirteenth resistor are commonly connected to the non-inverting input end of the first operational amplifier. The second end of the fourth capacitor is grounded. The second end of the twelfth resistor is grounded. The second end of the thirteenth resistor, the first end of the fourteenth resistor, the first end of the fifth capacitor, and the first end of the sixth capacitor are commonly connected to the first end of the first inductor coil. The second end of the fourteenth resistor is connected to a first DC power supply. The second end of the fifth capacitor is grounded. The second end of the sixth capacitor is grounded. The second end of the first inductor coil and the first end of the seventh capacitor are commonly connected to the first power supply end of the first operational amplifier. The second end of the seventh capacitor is grounded. The second power supply end of the first operational amplifier is grounded.

[0029] Optionally, the switching unit includes a radio frequency switch, a second inductor coil, a diode, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, and a twelfth capacitor;

[0030] The first end of the fifteenth resistor is connected to the control module. The second end of the fifteenth resistor and the first end of the eighth capacitor are commonly connected to the control end of the RF switch. The second end of the eighth capacitor is grounded. The first end of the ninth capacitor is connected to the input end of the RF switch. The second end of the ninth capacitor and the first end of the sixteenth resistor are commonly connected to the first end of the tenth capacitor. The second end of the sixteenth resistor is grounded. The second end of the tenth capacitor is the input end of the switch unit. The first end of the eleventh capacitor is connected to the output end of the RF switch. The second end of the eleventh capacitor is connected to the first end of the second inductor coil. The second end of the second inductor coil is connected to the first end of the seventeenth resistor. The second end of the seventeenth resistor, the first end of the twelfth capacitor, the first end of the eighteenth resistor, and the cathode of the diode are commonly connected and serve as the output end of the switch unit. The second end of the twelfth capacitor is grounded. The second end of the eighteenth resistor is grounded. The anode of the diode is grounded.

[0031] Optionally, the signal detection module includes a logarithmic amplifier, a second operational amplifier, a third operational amplifier, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, a twenty-fourth resistor, a twenty-fifth resistor, a thirteenth capacitor, a fourteenth capacitor, a fifteenth capacitor, a sixteenth capacitor, a seventeenth capacitor, and an eighteenth capacitor;

[0032] The first end of the nineteenth resistor serves as the input end of the signal detection module. The second end of the nineteenth resistor is connected to the first end of the twentieth resistor. The second end of the twentieth resistor is connected to the first end of the thirteenth capacitor. The second end of the thirteenth capacitor and the first end of the twenty-first resistor are commonly connected to the first end of the fourteenth capacitor. The second end of the twenty-first resistor is grounded. The second end of the fourteenth capacitor is connected to the input end of the logarithmic amplifier. The output end of the logarithmic amplifier is connected to the first end of the twenty-second resistor. The second end of the twenty-second resistor and the first end of the fifteenth capacitor are commonly connected to the non-inverting input end of the second operational amplifier. The second end of the fifteenth capacitor is grounded. The inverting input end and the output end of the second operational amplifier are commonly connected to the first end of the twenty-third resistor. The first power supply end of the second operational amplifier and the first end of the sixteenth capacitor are commonly connected to a second DC power supply. The second end of the sixteenth capacitor is grounded. The second power supply end of the second operational amplifier is grounded. The second end of the twenty-third resistor is connected to the first end of the twenty-fourth resistor. The second end of the twenty-fourth resistor, the first end of the twenty-fifth resistor, and the first end of the seventeenth capacitor are commonly connected to the inverting input end of the third operational amplifier. The second end of the twenty-fifth resistor, the second end of the seventeenth capacitor, and the output end of the third operational amplifier are commonly connected and serve as the output end of the signal detection module. The first end of the eighteenth capacitor is connected to the non-inverting input end of the third operational amplifier. The second end of the eighteenth capacitor is grounded.

[0033] Optionally, the signal adjustment module includes a digital potentiometer, a twenty-sixth resistor, a twenty-seventh resistor, a twenty-eighth resistor, a twenty-ninth resistor, and a nineteenth capacitor;

[0034] The first end of the twenty-sixth resistor is the first input end of the signal adjustment module. The second end of the twenty-sixth resistor is connected to the first control end of the digital potentiometer. The first end of the twenty-seventh resistor is the second input end of the signal adjustment module. The second end of the twenty-seventh resistor is connected to the second control end of the digital potentiometer. The first end of the twenty-eighth resistor is the third input end of the signal adjustment module. The second end of the twenty-eighth resistor is connected to the third control end of the digital potentiometer. The first end of the twenty-ninth resistor, the first output end of the digital potentiometer, and the first end of the nineteenth capacitor are commonly connected and serve as the output end of the signal adjustment module. The second end of the nineteenth capacitor is grounded. The second output end and the third output end of the digital potentiometer are commonly connected to the second end of the twenty-ninth resistor.

[0035] In a second aspect, an embodiment of the present application provides a signal detection device for connecting to a device under test. The signal detection device includes a first signal source and the signal detection circuit described in the first aspect or any optional manner of the first aspect.

[0036] The signal detection circuit and the signal detection device provided by the embodiments of the present application have the following beneficial effects:

[0037] In the signal detection circuit provided by the embodiment of the present application, when the control module detects a detection request, it sends a first control signal to the signal acquisition module and a second control signal to the switch module; so that the signal acquisition module acquires a preset radio frequency signal and sends the preset radio frequency signal to the device under test through the first connection path connected by the switch module; the device under test generates a second harmonic based on the preset radio frequency signal and sends the second harmonic to the signal detection module through the second connection path connected by the switch module, so that the signal detection module determines the voltage signal corresponding to the second harmonic; finally, the control module determines the target power corresponding to the second harmonic according to the voltage signal and the preset voltage power meter. The signal detection circuit provided by the present application can detect the power of the second harmonic without using a dedicated signal test instrument, reducing the test cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0039] Figure 1 It is a schematic structural diagram of a signal detection circuit provided by an embodiment of the present application;

[0040] Figure 2 It is a schematic structural diagram of a signal detection circuit provided by another embodiment of the present application;

[0041] Figure 3 It is a schematic circuit principle diagram of a signal detection circuit provided by an embodiment of the present application;

[0042] Figure 4 It is a schematic structural diagram of a signal detection device provided by an embodiment of the present application;

[0043] Figure 5 It is a schematic structural diagram of a signal detection system provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0044] In order to facilitate the clear description of the technical solutions of the embodiments of the present application, in the embodiments of the present application, the words "first", "second" and the like are used to distinguish the same items or similar items with substantially the same functions and effects. For example, the difference threshold and the second voltage value are only used to distinguish different voltage values, and do not limit their order. Those skilled in the art can understand that the words "first", "second" and the like do not limit the quantity and execution order, and the words "first", "second" and the like do not necessarily limit them to be different.

[0045] It should be noted that, in this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in this application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0046] In this application, "at least one" means one or more, and "more" means two or more. "And / or" describes the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural.

[0047] See also Figure 1 , Figure 1 This is a schematic diagram of the structure of a signal detection circuit provided in one embodiment of the present application. Figure 1 As shown, the signal detection circuit 10 can be connected to the device under test 2.

[0048] In the embodiment of the present application, the signal detection circuit 10 may include:

[0049] The control module 11 is connected to the signal acquisition module 12 and the switch module 13 . The control module 11 is used to send a first control signal to the signal acquisition module 12 and send a second control signal to the switch module 13 when a detection request is detected.

[0050] The signal acquisition module 12 is used to acquire a preset radio frequency signal when receiving the first control signal. The preset radio frequency signal can be set according to actual needs and is not limited here. For example, the preset radio frequency signal can be a radio frequency signal with a frequency of 2.176 megahertz (MHZ) and a power of 3 decibel milliwatts (dBm).

[0051] The switch module 13 is connected to the control module 11, the signal acquisition module 12, the signal detection module 14, and the device under test 2. The switch module 13 is configured to, when receiving the second control signal, connect the first connection path between the signal acquisition module 12 and the device under test 2 and the second connection path between the device under test 2 and the signal detection module 14, so that the signal acquisition module 12 sends a preset radio frequency signal to the device under test 2 through the first connection path, and the device under test 2 sends the second harmonic generated based on the preset radio frequency signal to the signal detection module 14 through the second connection path.

[0052] The signal detection module 14 is connected to the control module 11 and is configured to determine the voltage signal corresponding to the second harmonic and send the voltage signal to the control module 11.

[0053] The control module 11 is further configured to determine the target power corresponding to the second harmonic according to the voltage signal and the preset voltage power meter.

[0054] In practical applications, the control module 11 may be a controller. Exemplarily, the control module 11 may be a microcontroller unit (MCU).

[0055] It should be noted that the switch module 13 may include at least one radio frequency switch for controlling the on / off of the above different connection paths.

[0056] In the embodiment of the present application, after receiving the voltage signal sent by the signal detection module 14, the control module 11 may perform analog-to-digital conversion processing on the voltage signal through an analog-to-digital converter to obtain a voltage value corresponding to the voltage signal. Among them, the analog-to-digital converter is also called an analog-to-digital converter (ADC), that is, an A / D converter, which generally refers to an electronic component that converts an analog signal into a digital signal.

[0057] Based on this, the control module 11 may determine the target power of the second harmonic generated by the preset radio frequency signal according to the above voltage value and the preset voltage power meter.

[0058] As can be seen from the above, in the signal detection circuit provided in the embodiment of the present application, when the control module detects a detection request, it sends a first control signal to the signal acquisition module and a second control signal to the switch module; so that the signal acquisition module acquires a preset radio frequency signal, and through the first connection path connected by the switch module, sends the preset radio frequency signal to the device under test; the device under test generates a second harmonic based on the preset radio frequency signal, and sends the second harmonic to the signal detection module through the second connection path connected by the switch module, so that the signal detection module determines the voltage signal corresponding to the second harmonic; finally, the control module determines the target power corresponding to the second harmonic according to the voltage signal and the preset voltage power meter. The signal detection circuit provided in the present application can detect the power of the second harmonic without using a dedicated signal test instrument, reducing the test cost.

[0059] In an embodiment of the present application, the signal detection circuit 10 can be connected to a signal generation device, so that the signal acquisition module 12 can acquire a preset radio frequency signal from the signal generation device.

[0060] In another embodiment of the present application, a signal generation module 15 can be provided in the signal detection circuit 10, and the signal generation module 15 can be used to generate a preset radio frequency signal. Based on this, the signal acquisition module 12 can acquire the preset radio frequency signal from the signal generation module 15. Please refer to Figure 2 , Figure 2 which is a schematic structural diagram of the signal detection circuit provided in another embodiment of the present application. As Figure 2 shown, compared with Figure 1 the corresponding embodiment, the signal detection circuit 10 in this embodiment can further include a signal generation module 15 and a signal adjustment module 16. Among them, the signal generation module 15 is used to generate a first radio frequency signal, and the signal adjustment module 16 is used to adjust the first radio frequency signal generated by the signal generation module 15 until the first radio frequency signal generated by the signal generation module 15 becomes a preset radio frequency signal.

[0061] Specifically, the control module 11 is further connected to the signal generation module 15, and the control module 11 is further used to send a third control signal to the signal generation module 15 and a fourth control signal to the switch module 13 when detecting a calibration request.

[0062] The signal generation module 15 is used to generate a first radio frequency signal when receiving the third control signal.

[0063] The switch module 13 is further used to connect the third connection path between the signal generation module 15 and the signal detection module 14 when receiving the fourth control signal, so that the signal generation module 15 sends the first radio frequency signal to the signal detection module 14 through the third connection path.

[0064] The signal detection module 14 is also used to determine the actual voltage signal corresponding to the first radio frequency signal and send the actual voltage signal to the control module 11.

[0065] The control module 11 is also used to send a fifth control signal to the signal adjustment module 16 when the difference between the voltage value of the detected actual voltage signal and the preset voltage threshold is greater than the difference threshold.

[0066] The signal adjustment module 16 is used to adjust the first radio frequency signal by adjusting the resistance value of the signal adjustment module 16 when receiving the fifth control signal until the first radio frequency signal becomes the preset radio frequency signal.

[0067] Based on this, the signal acquisition module 12 is also connected to the signal generation module 15, so that the signal acquisition module 12 can obtain the preset radio frequency signal from the signal generation module 15.

[0068] In this embodiment, the signal adjustment module 16 can be a program-controlled resistor or a digital potentiometer.

[0069] It should be noted that in order to improve the accuracy of signal detection and ensure that the signal detection circuit 10 detects the second harmonic generated by the preset radio frequency signal, before sending a detection request to the control module 11, the signal detection circuit 10 also needs to send a calibration request to the control module 11 to calibrate the radio frequency signal generated by the signal generation module 15, so as to ensure that the signal acquisition module 12 obtains an accurate preset radio frequency signal.

[0070] In this embodiment, after receiving the actual voltage signal corresponding to the first radio frequency signal, the control module 11 can perform analog-to-digital conversion processing on the actual voltage signal through an analog-to-digital converter to obtain the voltage value corresponding to the actual voltage signal.

[0071] The control module 11 can calculate the difference between the voltage value corresponding to the actual voltage signal and the preset voltage threshold and compare the difference with the difference threshold. Among them, the difference threshold can be determined according to actual needs and is not limited here.

[0072] In an embodiment of the present application, when the control module 11 detects that the difference between the voltage value of the actual voltage signal and the preset voltage threshold is greater than the difference threshold, it means that the first radio frequency signal is too different from the preset radio frequency signal. Therefore, the control module 11 needs to send a fifth control signal to the signal adjustment module 16 to enable the signal adjustment module 16 to adjust the first radio frequency signal generated by the signal generation module 15.

[0073] In another embodiment of the present application, when the control module 11 detects that the difference between the voltage value of the actual voltage signal and the preset voltage threshold is less than or equal to the difference threshold, it indicates that the first radio frequency signal is not much different from the preset radio frequency signal, that is, the first radio frequency signal is the preset radio frequency signal. Therefore, the control module 11 can continue to send the first control signal to the signal acquisition module 12 so that the signal acquisition module 12 acquires the preset radio frequency signal.

[0074] Please continue to refer to Figure 2 , in yet another embodiment of the present application, the signal detection circuit 10 may further include a storage module 17, and the storage module 17 can be used to store a preset voltage power table. Wherein, the preset voltage power table is used to describe the corresponding relationship between different voltage signals and power.

[0075] Based on this, the control module 11 can obtain the preset voltage signal and the preset voltage power table from the storage module 17 connected thereto, and determine the preset voltage threshold according to the preset voltage signal.

[0076] In yet another embodiment of the present application, the control module 11 may also be connected to a first signal source 20 for generating a preset radio frequency signal to obtain the preset radio frequency signal from the first signal source 20.

[0077] Specifically, the control module 11 is further configured to obtain the preset radio frequency signal from the first signal source 20, determine the preset voltage signal corresponding to the preset radio frequency signal, and send the preset radio frequency signal and the preset voltage signal to the storage module 17; wherein, the preset radio frequency signal carries the preset power corresponding to the preset radio frequency signal.

[0078] The storage module 17 is configured to store the preset voltage signal and the preset power in association with the preset voltage power table.

[0079] It should be noted that in this embodiment, the control module 11 can obtain the preset voltage power table stored in the storage module 17 to calculate the difference between the voltage value of the actual voltage signal corresponding to the first radio frequency signal determined by the signal detection module 14 and the preset voltage thresholds of different preset voltage signals in the preset voltage power table, and compare the difference with the difference threshold to detect whether the first radio frequency signal generated by the signal generation module 15 is the preset radio frequency signal.

[0080] In some possible embodiments, the control module 11 may be connected to a second signal source. Wherein, the second signal source is used to generate a second radio frequency signal whose frequency is a preset multiple of the frequency of the preset radio frequency signal and whose power is any value within a preset range. The preset multiple may be 2 times, and the preset range may be [-80dBm, -20dBm].

[0081] Specifically, in this embodiment, the control module 11 is further configured to obtain second radio frequency signals with different powers from a second signal source, determine a preset voltage signal corresponding to the second radio frequency signal, and send the second radio frequency signal and the preset voltage signal corresponding thereto to the storage module 17.

[0082] The storage module 17 is configured to store the above-mentioned preset voltage signal and the power of the second radio frequency signal in association in a preset voltage-power table.

[0083] Based on this, the control module 11 can obtain the preset voltage-power table stored in the storage module 17, compare the voltage signal corresponding to the second harmonic determined by the signal detection module 14 with different preset voltage signals in the preset voltage-power table, and then determine a preset voltage signal equal to the voltage signal corresponding to the second harmonic. Then, according to the corresponding relationship between the preset voltage signal and the preset power, the target power corresponding to the second harmonic is determined.

[0084] Please continue to refer to Figure 2 In another embodiment of the present application, the signal detection circuit 10 may further include a display module 18, and the display module 18 is connected to the control module 11.

[0085] Specifically, in this embodiment, the control module 11 is further configured to send the target power to the display module 18;

[0086] The display module 18 is configured to display the above-mentioned target power.

[0087] In another embodiment of the present application, the signal detection circuit 10 may further include a power supply module, and the power supply module is connected to the control module 11.

[0088] The power supply module is configured to supply power to the control module 11.

[0089] Please continue to refer to Figure 2 In another embodiment of the present application, the switch module 13 may include three switch units: a first switch unit 131, a second switch unit 132, and a third switch unit 133.

[0090] In this embodiment, the first switch unit 131, the second switch unit 132, and the third switch unit 133 are all connected to the control module 11 and are configured to control the on / off of the first connection path, the second connection path, and the third connection path.

[0091] Specifically, the first switch unit 131 is connected to the signal acquisition module 12 and the device under test 2 and is configured to control the on / off of the first connection path.

[0092] The second switch unit 132 is connected to the first signal source 20, the first switch unit 131, and the third switch unit 133. The first switch unit 131, the second switch unit 132, and the third switch unit 133 jointly control the on / off of the third connection path.

[0093] The third switch unit 133 is connected to the device under test 2 and the signal detection module 14, and is used to control the on / off of the second connection path.

[0094] Please refer to Figure 3 , Figure 3 which is a schematic diagram of the circuit principle of the signal detection circuit provided by an embodiment of the present application. For the sake of convenience of description, only the parts related to this embodiment are shown.

[0095] As Figure 3 shown, the signal generation module 15 includes: a signal generation chip U1, a first operational amplifier U2, a first inductor coil L1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, and a seventh capacitor C7.

[0096] The first end of the first resistor R1 and the input end of the signal generation chip U1 are commonly connected and used as the input end of the signal generation module 15. The second end of the first resistor R1 is grounded. The output end of the signal generation chip U1 is connected to the first end of the second resistor R2. The second end of the second resistor R2 is connected to the first end of the third resistor R3. The second end of the third resistor R3 and the first end of the fourth resistor R4 are commonly connected to the first end of the first capacitor C1. The second end of the fourth resistor R4 is grounded. The second end of the first capacitor C1 and the first end of the fifth resistor R5 are commonly connected to the first end of the sixth resistor R6. The second end of the fifth resistor R5 is grounded. The second end of the sixth resistor R6 and the first end of the seventh resistor R7 are commonly connected to the first end of the second capacitor C2. The second end of the seventh resistor R7 is grounded. The second end of the second capacitor C2 is connected to the first end of the eighth resistor R8. The second end of the eighth resistor R8 and the first end of the ninth resistor R9 are commonly connected to the inverting input end of the operational amplifier U2. The second end of the ninth resistor R9 and the first end of the third capacitor C3 are commonly connected to the output end of the first operational amplifier U2. The second end of the third capacitor C3 is connected to the first end of the tenth resistor R10. The second end of the tenth resistor R10 is connected to the first end of the eleventh resistor R11. The second end of the eleventh resistor R11 serves as the output end of the signal generation module 15. The first end of the twelfth resistor R12, the first end of the fourth capacitor C4, and the first end of the thirteenth resistor R13 are commonly connected to the non-inverting input end of the first operational amplifier U2. The second end of the fourth capacitor C4 is grounded. The second end of the twelfth resistor R12 is grounded. The second end of the thirteenth resistor R13, the first end of the fourteenth resistor R14, the first end of the fifth capacitor C5, and the first end of the sixth capacitor C6 are commonly connected to the first end of the first inductor coil L1. The second end of the fourteenth resistor R14 is connected to the first DC power supply. The second end of the fifth capacitor C5 is grounded. The second end of the sixth capacitor C6 is grounded. The second end of the first inductor coil L1 and the first end of the seventh capacitor C7 are commonly connected to the first power supply end of the first operational amplifier U2. The second end of the seventh capacitor C7 is grounded. The second power supply end of the first operational amplifier U2 is grounded.

[0097] It should be noted that in this embodiment, the input pin TXin of the signal generation chip U1 is the input end of the signal generation chip U1. The first end of the first resistor R1 and the input pin TXin of the signal generation chip U1 are commonly connected and used as the input end of the signal generation module 15, and are respectively connected to the input end of the signal acquisition module 12 and the pin PD0 of the control module 11.

[0098] The output pin TXout of the signal generation chip U1 is the output end of the signal generation chip U1, and is connected to the first end of the second resistor R2.

[0099] Please continue to refer to Figure 3 , in an embodiment of the present application, taking the first switch unit 131 as an example, the specific circuit structure diagram of the switch unit will be described.

[0100] The first switch unit 131 includes: a radio frequency switch U3, a second inductor coil L2, a diode D, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, and a twelfth capacitor C12.

[0101] The first end of the fifteenth resistor R15 is connected to the control module 11. The second end of the fifteenth resistor R15 and the first end of the eighth capacitor C8 are commonly connected to the control end of the radio frequency switch U3. The second end of the eighth capacitor C8 is grounded. The first end of the ninth capacitor C9 is connected to the input end of the radio frequency switch U3. The second end of the ninth capacitor C9 and the first end of the sixteenth resistor R16 are commonly connected to the first end of the tenth capacitor C10. The second end of the sixteenth resistor R16 is grounded. The second end of the tenth capacitor C10 is the input end of the first switch unit 131. The first end of the eleventh capacitor C11 is connected to the output end of the radio frequency switch U3. The second end of the eleventh capacitor C11 is connected to the first end of the second inductor coil L2. The second end of the second inductor coil L2 is connected to the first end of the seventeenth resistor R17. The second end of the seventeenth resistor R17, the first end of the twelfth capacitor C12, the first end of the eighteenth resistor R18, and the cathode of the diode D are commonly connected and serve as the output end of the first switch unit 131. The second end of the twelfth capacitor C12 is grounded. The second end of the eighteenth resistor R18 is grounded. The anode of the diode D is grounded.

[0102] It should be noted that, as Figure 3 shown, the radio frequency switch U3 is provided with three control ends, including control pins V1, V2, and V3. Each control pin of the radio frequency switch U3 is commonly connected to the second end of a fifteenth resistor R15 and the first end of an eighth capacitor C8.

[0103] Based on this, for the fifteenth resistor R15 connected to the control pin V1 of the radio frequency switch U3, the first end of this fifteenth resistor R15 is connected to the pin PD3 of the control module 11; for the fifteenth resistor R15 connected to the control pin V2 of the radio frequency switch U3, the first end of this fifteenth resistor R15 is connected to the pin PD2 of the control module 11; for the fifteenth resistor R15 connected to the control pin V3 of the radio frequency switch U3, the first end of this fifteenth resistor R15 is connected to the pin PD1 of the control module 11.

[0104] In this embodiment, the signal input pin RFC of the radio frequency switch U3 is the input end of the radio frequency switch U3. The first end of the ninth capacitor C9 is connected to the pin RFC of the radio frequency switch U3.

[0105] The signal output pins RF1, RF2, RF3, and RF4 of the RF switch U3 are all output terminals of the RF switch U3, and each signal output pin is connected to the first end of an eleventh capacitor C11.

[0106] Please continue to refer to Figure 3 In another embodiment of the present application, the signal detection module 14 includes: a logarithmic amplifier U4, a second operational amplifier U5, a third operational amplifier U6, a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21, a twenty-second resistor R22, a twenty-third resistor R23, a twenty-fourth resistor R24, a twenty-fifth resistor R25, a thirteenth capacitor C13, a fourteenth capacitor C14, a fifteenth capacitor C15, a sixteenth capacitor C16, a seventeenth capacitor C17, and an eighteenth capacitor C18.

[0107] The first end of the nineteenth resistor R19 serves as the input terminal of the signal detection module 14. The second end of the nineteenth resistor R19 is connected to the first end of the twentieth resistor R20. The second end of the twentieth resistor R20 is connected to the first end of the thirteenth capacitor C13. The second end of the thirteenth capacitor C13 and the first end of the twenty-first resistor R21 are commonly connected to the first end of the fourteenth capacitor C14. The second end of the twenty-first resistor R21 is grounded. The second end of the fourteenth capacitor C14 is connected to the input terminal of the logarithmic amplifier U4. The output terminal of the logarithmic amplifier U4 is connected to the first end of the twenty-second resistor R22. The second end of the twenty-second resistor R22 and the first end of the fifteenth capacitor C15 are commonly connected to the non-inverting input terminal of the second operational amplifier U5. The second end of the fifteenth capacitor C15 is grounded. The inverting input terminal and the output terminal of the second operational amplifier U5 are commonly connected to the first end of the twenty-third resistor R23. The first power supply terminal of the second operational amplifier U5 and the first end of the sixteenth capacitor C16 are commonly connected to the second DC power supply. The second end of the sixteenth capacitor C16 is grounded. The second power supply terminal of the second operational amplifier U5 is grounded. The second end of the twenty-third resistor R23 is connected to the first end of the twenty-fourth resistor R24. The second end of the twenty-fourth resistor R24, the first end of the twenty-fifth resistor R25, and the first end of the seventeenth capacitor C17 are commonly connected to the inverting input terminal of the third operational amplifier U6. The second end of the twenty-fifth resistor R25, the second end of the seventeenth capacitor C17, and the output terminal of the third operational amplifier U6 are commonly connected and serve as the output terminal of the signal detection module 14. The first end of the eighteenth capacitor C18 is connected to the non-inverting input terminal of the third operational amplifier U6. The second end of the eighteenth capacitor C18 is grounded.

[0108] In this embodiment, the second DC power supply can provide a voltage with a voltage value of 3.3 volts (V).

[0109] It should be noted that the input pin INHI of the logarithmic amplifier U4 is the input terminal of the logarithmic amplifier U4, and the input pin INHI of the logarithmic amplifier U4 is connected to the second terminal of the fourteenth capacitor C14.

[0110] The output pin VOUT of the logarithmic amplifier U4 is the output terminal of the logarithmic amplifier U4, and the output pin VOUT of the logarithmic amplifier U4 is connected to the first terminal of the twenty-second resistor R22.

[0111] The second terminal of the twenty-fifth resistor R25, the second terminal of the seventeenth capacitor C17, and the output terminal of the third operational amplifier U6 are commonly connected and used as the output terminal of the signal detection module 14. The output terminal of the signal detection module 14 is connected to the input pin PC0 / ADC_IN10 of the control module 11.

[0112] Please continue to refer to Figure 3 In another embodiment of the present application, the signal adjustment module 16 includes: a digital potentiometer U7, a twenty-sixth resistor R26, a twenty-seventh resistor R27, a twenty-eighth resistor R28, a twenty-ninth resistor R29, and a nineteenth capacitor C19.

[0113] The first terminal of the twenty-sixth resistor R26 is the first input terminal of the signal adjustment module 16. The second terminal of the twenty-sixth resistor R26 is connected to the first control terminal of the digital potentiometer U7. The first terminal of the twenty-seventh resistor R27 is the second input terminal of the signal adjustment module 16. The second terminal of the twenty-seventh resistor R27 is connected to the second control terminal of the digital potentiometer U7. The first terminal of the twenty-eighth resistor R28 is the third input terminal of the signal adjustment module 16. The second terminal of the twenty-eighth resistor R28 is connected to the third control terminal of the digital potentiometer U7. The first terminal of the twenty-ninth resistor R29, the first output terminal of the digital potentiometer U7, and the first terminal of the nineteenth capacitor C19 are commonly connected and used as the output terminal of the signal adjustment module 16. The second terminal of the nineteenth capacitor C19 is grounded. The second output terminal and the third output terminal of the digital potentiometer U7 are commonly connected to the second terminal of the twenty-ninth resistor R29.

[0114] It should be noted that the pin U / D of the digital potentiometer U7 is the first control terminal of the digital potentiometer U7, and the pin U / D of the digital potentiometer U7 is connected to the second terminal of the twenty-sixth resistor R26; the pin INC of the digital potentiometer U7 is the second control terminal of the digital potentiometer U7, and the pin INC of the digital potentiometer U7 is connected to the second terminal of the twenty-seventh resistor R27; the pin CS of the digital potentiometer U7 is the third control terminal of the digital potentiometer U7, and the pin CS of the digital potentiometer U7 is connected to the second terminal of the twenty-eighth resistor R28.

[0115] The pin Rh of the digital potentiometer U7 is the first output terminal of the digital potentiometer U7. The pin Rh of the digital potentiometer U7 and the first end of the twenty-ninth resistor R29 are connected together and used as the output terminal of the signal adjustment module 16, and are connected to the reset pin RES of the signal generation chip U1. The pin Rwb of the digital potentiometer U7 is the second output terminal of the digital potentiometer U7, and the pin RL of the digital potentiometer U7 is the third output terminal of the digital potentiometer U7. The pin Rwb of the digital potentiometer U7 and the pin RL of the digital potentiometer U7 are connected to the second end of the twenty-ninth resistor R29.

[0116] The following combines Figure 3 to detail the specific working principle of the signal detection circuit provided in an embodiment of the present application:

[0117] As Figure 3 shown, the working process of the signal detection circuit 10 is as follows:

[0118] First, the signal detection circuit 10 can control the control module 11 to obtain a preset radio frequency signal from the first signal source 20, determine the preset voltage signal corresponding to the preset radio frequency signal, and send the preset radio frequency signal and the preset voltage signal to the storage module 17, so that the storage module 17 can associate and store the preset voltage signal and the preset power in the preset voltage-power table.

[0119] After that, before the signal detection circuit 10 needs to detect the power of the second harmonic generated by the preset radio frequency signal, it is necessary to calibrate the first radio frequency signal generated by the signal generation module 15 to ensure that the first radio frequency signal generated by the signal generation module 15 is the preset radio frequency signal.

[0120] Based on this, the signal detection circuit 10 can send a calibration request to the control module 11. When the control module 11 detects the calibration request, it can send a third control signal to the signal generation module 15 and a fourth control signal to the switch module 13.

[0121] The third control signal reaches the first resistor R1 via the pin PD0 of the control module 11 and then reaches the signal generation chip U1 via the first resistor R1. At this time, the signal generation chip U1 can generate a first radio frequency signal, which is processed and output through a signal processing circuit (including an amplification circuit and a filtering circuit) composed of the second resistor R2, the third resistor R3, the first capacitor C1, the sixth resistor R6, the second capacitor C2, the eighth resistor R8, the first operational amplifier U2, the ninth resistor R9, the tenth resistor R10, the eleventh resistor R11, the twelfth resistor R12, the thirteenth resistor R13, the fourteenth resistor R14, the first inductor coil L1, the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5, the sixth capacitor C6, and the seventh capacitor C7. The processed first radio frequency signal is sent to the signal detection module 14 through a third connection circuit connected by the first switch unit 131, the second switch unit 132, and the third switch unit 133.

[0122] The processed first radio frequency signal is processed by the logarithmic amplifier U4 in the signal detection module 14 and becomes an actual voltage signal. The actual voltage signal is filtered and output through a filtering circuit composed of the twenty-second resistor R22 and the fifteenth capacitor C15. The filtered actual voltage signal is amplified by an amplification circuit composed of the second operational amplifier U5, the third operational amplifier U6, the sixteenth capacitor C16, the seventeenth capacitor C17, the eighteenth capacitor C18, the twenty-third resistor R23, the twenty-fourth resistor R24, and the twenty-fifth resistor R25 and sent to the control module 11.

[0123] After detecting the above actual voltage signal, the control module 11 can calculate the difference between the voltage value of the actual voltage signal and a preset voltage threshold, and compare the difference with a difference threshold. When the control module 11 detects that the above difference is greater than the difference threshold, it can send a fifth control signal to the signal adjustment module 16.

[0124] The digital potentiometer U7 in the signal adjustment module 16 can adjust its own resistance based on the above fifth control signal to adjust the first radio frequency signal generated by the signal generation module 15 until the first radio frequency signal becomes a preset radio frequency signal.

[0125] At this time, the control module 11 can send a first control signal to the signal acquisition module 12 and a second control signal to the switch module 13, so that the signal acquisition module 12 can obtain the preset radio frequency signal from the signal generation module 15.

[0126] After the signal acquisition module 12 acquires a preset radio frequency signal, the preset radio frequency signal is sent to the device under test 2 through the first connection circuit connected by the first switch unit 131 in the switch module 13. Here, the device under test 2 will generate second harmonics based on the preset radio frequency signal, and the second harmonics are sent to the signal detection module 14 through the second connection circuit connected by the third switch unit 133 in the switch module 13.

[0127] The above-mentioned second harmonics are processed by the logarithmic amplifier U4 in the signal detection module 14 to become a voltage signal. The voltage signal is filtered by the filter circuit composed of the twenty-second resistor R22 and the fifteenth capacitor C15 and then output. The filtered voltage signal is amplified by the amplifier circuit composed of the second operational amplifier U5, the third operational amplifier U6, the sixteenth capacitor C16, the seventeenth capacitor C17, the eighteenth capacitor C18, the twenty-third resistor R23, the twenty-fourth resistor R24, and the twenty-fifth resistor R25 and sent to the control module 11.

[0128] Finally, the control module 11 can determine the target power corresponding to the above-mentioned second harmonics according to the above voltage signal and the preset voltage power meter to complete the detection of the second harmonics.

[0129] An embodiment of the present application also provides a signal detection device. Please refer to Figure 4 , Figure 4 which is a schematic structural diagram of the signal detection device provided by an embodiment of the application. As Figure 4 shown, the signal detection device 1 is used to connect the device under test 2. The signal detection device 1 includes a signal detection circuit 10 and a first signal source 20. Among them, the signal detection circuit 10 can be Figures 1 to 3 the signal detection circuit 10 in any corresponding embodiment.

[0130] An embodiment of the present application also provides a signal detection system. Please refer to Figure 5 , Figure 5 which is a schematic structural diagram of the signal detection system provided by an embodiment of the application. As Figure 5 shown, the signal detection system 100 includes a signal detection device 1 and a device under test 2. Among them, the signal detection device 1 includes a signal detection circuit 10 and a first signal source 20. The signal detection circuit 10 can be Figures 1 to 3 the signal detection circuit 10 in any corresponding embodiment.

[0131] In the above embodiments, the descriptions of the respective embodiments have their own emphases. For parts not detailed or recorded in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0132] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A signal detection circuit, characterized in that, It is provided in a signal detection device. The signal detection circuit is used to connect to a device under test. The signal detection circuit includes: A control module, connected to a signal acquisition module and a switch module. The control module is used to send a first control signal to the signal acquisition module and a second control signal to the switch module when a detection request is detected. The signal acquisition module is used to acquire a preset radio frequency signal when receiving the first control signal. The switch module is connected to the control module, the signal acquisition module, the signal detection module, and the device under test. The switch module is used to connect a first connection path between the signal acquisition module and the device under test and a second connection path between the device under test and the signal detection module when receiving the second control signal, so that the signal acquisition module sends the preset radio frequency signal to the device under test through the first connection path, and the device under test sends a second harmonic generated based on the preset radio frequency signal to the signal detection module through the second connection path. The signal detection module, connected to the control module, is used to determine a voltage signal corresponding to the second harmonic and send the voltage signal to the control module. The control module is further used to determine a target power corresponding to the second harmonic according to the voltage signal and a preset voltage power meter. The signal detection circuit further includes a signal generation module and a signal adjustment module. The signal adjustment module is connected to the control module and the signal generation module. The control module is further connected to the signal generation module. The control module is further used to send a third control signal to the signal generation module and a fourth control signal to the switch module when a calibration request is detected. The signal generation module is used to generate a first radio frequency signal when receiving the third control signal. The switch module is further used to connect a third connection path between the signal generation module and the signal detection module when receiving the fourth control signal, so that the signal generation module sends the first radio frequency signal to the signal detection module through the third connection path. The signal detection module is further used to determine an actual voltage signal corresponding to the first radio frequency signal and send the actual voltage signal to the control module. The control module is further connected to the signal adjustment module. The control module is further used to send a fifth control signal to the signal adjustment module when the difference between the voltage value of the actual voltage signal and a preset voltage threshold is greater than a difference threshold. The signal adjustment module is used to adjust the first radio frequency signal by adjusting the resistance value of the signal adjustment module when receiving the fifth control signal until the first radio frequency signal becomes the preset radio frequency signal. The signal acquisition module is further connected to the signal generation module. Specifically, the signal acquisition module is used to obtain the preset radio frequency signal from the signal generation module.

2. The signal detection circuit according to claim 1, wherein The control module is further connected to a first signal source. The signal detection circuit further includes a storage module, and the storage module is connected to the control module. The control module is further configured to obtain the preset radio frequency signal from the first signal source, determine the preset voltage signal corresponding to the preset radio frequency signal, and send the preset radio frequency signal and the preset voltage signal to the storage module; wherein, the preset radio frequency signal carries the preset power corresponding to the preset radio frequency signal. The storage module is configured to store the preset voltage signal and the preset power in association in the preset voltage-power table.

3. The signal detection circuit according to claim 1, wherein The signal detection circuit further includes a display module; the display module is connected to the control module. The control module is further configured to send the target power to the display module. The display module is configured to display the target power.

4. The signal detection circuit according to claim 1, wherein The switch module includes three switch units; the three switch units are all connected to the control module. The three switch units are configured to control the on / off states of the first connection path, the second connection path, and the third connection path.

5. The signal detection circuit according to claim 1, wherein The signal generation module includes a signal generation chip, a first operational amplifier, a first inductance coil, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, and a seventh capacitor. The first end of the first resistor and the input end of the signal generation chip are commonly connected and serve as the input end of the signal generation module. The second end of the first resistor is grounded. The output end of the signal generation chip is connected to the first end of the second resistor. The second end of the second resistor is connected to the first end of the third resistor. The second end of the third resistor and the first end of the fourth resistor are commonly connected to the first end of the first capacitor. The second end of the fourth resistor is grounded. The second end of the first capacitor and the first end of the fifth resistor are commonly connected to the first end of the sixth resistor. The second end of the fifth resistor is grounded. The second end of the sixth resistor and the first end of the seventh resistor are commonly connected to the first end of the second capacitor. The second end of the seventh resistor is grounded. The second end of the second capacitor is connected to the first end of the eighth resistor. The second end of the eighth resistor and the first end of the ninth resistor are commonly connected to the inverting input end of the first operational amplifier. The second end of the ninth resistor and the first end of the third capacitor are commonly connected to the output end of the first operational amplifier. The second end of the third capacitor is connected to the first end of the tenth resistor. The second end of the tenth resistor is connected to the first end of the eleventh resistor. The second end of the eleventh resistor serves as the output end of the signal generation module. The first end of the twelfth resistor, the first end of the fourth capacitor, and the first end of the thirteenth resistor are commonly connected to the non-inverting input end of the first operational amplifier. The second end of the fourth capacitor is grounded. The second end of the twelfth resistor is grounded. The second end of the thirteenth resistor, the first end of the fourteenth resistor, the first end of the fifth capacitor, and the first end of the sixth capacitor are commonly connected to the first end of the first inductor coil. The second end of the fourteenth resistor is connected to the first DC power supply. The second end of the fifth capacitor is grounded. The second end of the sixth capacitor is grounded. The second end of the first inductor coil and the first end of the seventh capacitor are commonly connected to the first power supply end of the first operational amplifier. The second end of the seventh capacitor is grounded. The second power supply end of the first operational amplifier is grounded.

6. The signal detection circuit according to claim 4, wherein The switch unit includes a radio frequency switch, a second inductor coil, a diode, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, and a twelfth capacitor; The first end of the fifteenth resistor is connected to the control module. The second end of the fifteenth resistor and the first end of the eighth capacitor are commonly connected to the control end of the RF switch. The second end of the eighth capacitor is grounded. The first end of the ninth capacitor is connected to the input end of the RF switch. The second end of the ninth capacitor and the first end of the sixteenth resistor are commonly connected to the first end of the tenth capacitor. The second end of the sixteenth resistor is grounded. The second end of the tenth capacitor is the input end of the switch unit. The first end of the eleventh capacitor is connected to the output end of the RF switch. The second end of the eleventh capacitor is connected to the first end of the second inductor coil. The second end of the second inductor coil is connected to the first end of the seventeenth resistor. The second end of the seventeenth resistor, the first end of the twelfth capacitor, the first end of the eighteenth resistor, and the cathode of the diode are commonly connected and serve as the output end of the switch unit. The second end of the twelfth capacitor is grounded. The second end of the eighteenth resistor is grounded. The anode of the diode is grounded.

7. The signal detection circuit according to claim 1, characterized in that The signal detection module includes a logarithmic amplifier, a second operational amplifier, a third operational amplifier, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, a twenty-fourth resistor, a twenty-fifth resistor, a thirteenth capacitor, a fourteenth capacitor, a fifteenth capacitor, a sixteenth capacitor, a seventeenth capacitor, and an eighteenth capacitor. The first end of the nineteenth resistor serves as the input end of the signal detection module. The second end of the nineteenth resistor is connected to the first end of the twentieth resistor. The second end of the twentieth resistor is connected to the first end of the thirteenth capacitor. The second end of the thirteenth capacitor and the first end of the twenty-first resistor are commonly connected to the first end of the fourteenth capacitor. The second end of the twenty-first resistor is grounded. The second end of the fourteenth capacitor is connected to the input end of the logarithmic amplifier. The output end of the logarithmic amplifier is connected to the first end of the twenty-second resistor. The second end of the twenty-second resistor and the first end of the fifteenth capacitor are commonly connected to the non-inverting input end of the second operational amplifier. The second end of the fifteenth capacitor is grounded. The inverting input end and the output end of the second operational amplifier are commonly connected to the first end of the twenty-third resistor. The first power supply end of the second operational amplifier and the first end of the sixteenth capacitor are commonly connected to a second DC power supply. The second end of the sixteenth capacitor is grounded. The second power supply end of the second operational amplifier is grounded. The second end of the twenty-third resistor is connected to the first end of the twenty-fourth resistor. The second end of the twenty-fourth resistor, the first end of the twenty-fifth resistor, and the first end of the seventeenth capacitor are commonly connected to the inverting input end of the third operational amplifier. The second end of the twenty-fifth resistor, the second end of the seventeenth capacitor, and the output end of the third operational amplifier are commonly connected and serve as the output end of the signal detection module. The first end of the eighteenth capacitor is connected to the non-inverting input end of the third operational amplifier. The second end of the eighteenth capacitor is grounded.

8. The signal detection circuit according to claim 1, characterized in that, The signal adjustment module includes a digital potentiometer, a twenty-sixth resistor, a twenty-seventh resistor, a twenty-eighth resistor, a twenty-ninth resistor, and a nineteenth capacitor; The first end of the twenty-sixth resistor is the first input end of the signal adjustment module. The second end of the twenty-sixth resistor is connected to the first control end of the digital potentiometer. The first end of the twenty-seventh resistor is the second input end of the signal adjustment module. The second end of the twenty-seventh resistor is connected to the second control end of the digital potentiometer. The first end of the twenty-eighth resistor is the third input end of the signal adjustment module. The second end of the twenty-eighth resistor is connected to the third control end of the digital potentiometer. The first end of the twenty-ninth resistor, the first output end of the digital potentiometer, and the first end of the nineteenth capacitor are commonly connected and serve as the output end of the signal adjustment module. The second end of the nineteenth capacitor is grounded. The second output end of the digital potentiometer and the third output end of the digital potentiometer are commonly connected to the second end of the twenty-ninth resistor.

9. A signal detection device, characterized in that, For connecting the device under test, the signal detection device includes a first signal source and the signal detection circuit according to any one of claims 1-8.

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