Signal processing circuit, signal generation device, and received signal detection device
By combining the first diode and resistor in the signal processing circuit, the problem of traditional transistor switching circuits being unable to detect sinusoidal signals is solved, achieving efficient signal processing and detection, and improving the clarity and recognizability of signal transmission.
Patent Information
- Application Number
- CN202422624375.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-29
- Publication Date
- 2025-11-11
- Estimated Expiration
- 2034-10-29
AI Technical Summary
Traditional transistor switching circuits have difficulty accurately detecting sinusoidal signals, resulting in inaccurate or distorted signal detection.
The circuit employs a signal processing circuit, including a signal processing module, a voltage divider protection module, a filtering module, and an ADC sampling circuit. Through the combined design of the first diode and resistor, it ensures that the signal flows in only one direction during processing to prevent reverse interference. It also utilizes a pull-up power supply to improve the output signal level, making it suitable for the detection of various signal types.
It improves the clarity and recognizability of signal transmission, can detect multiple signals, ensures the consistency and timeliness of output and input signals, prevents signal reverse interference, and is suitable for complex working conditions.
Smart Images
Figure CN223540531U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of signal detection technology, and in particular to a signal processing circuit, a signal generating device, and a receiving signal detection device. Background Technology
[0002] In electronic systems, signal processing and detection are crucial. Various signal types, such as pulse width modulation (PWM) signals, sinusoidal signals, non-DC signals, or other changing signals, all require appropriate circuit design for effective processing. Among these, PWM signals, due to their widespread application in motor control, modulation and demodulation, and data transmission, have always been an important research subject in signal processing.
[0003] The core characteristic of PWM signals lies in their ability to control power transfer by adjusting the signal's duty cycle (i.e., the proportion of high-level time to the cycle time). In practical applications, the detection and processing of PWM signals often rely on switching circuits, with transistors being one such application. The working principle of a transistor switching circuit is based on controlling the current flow between the transistor's collector and emitter using the transistor's base voltage. Specifically, when the PWM signal causes the transistor's base voltage to rise to a threshold value, the transistor conducts, allowing current to flow from the collector to the emitter; when the PWM signal causes the base voltage to drop, the transistor turns off, blocking current flow. In this way, the transistor can accurately follow the switching state of the PWM signal, thereby achieving the detection and control of the PWM signal.
[0004] However, traditional transistor switching circuits face certain challenges when the input signal is a sine wave. A sine wave is a continuously changing signal, with its voltage varying constantly within its period, lacking a definite switching point. This continuous variation makes it difficult for transistor switching circuits to accurately follow the changes in the sine wave. Transistor switching circuit designs are typically based on fixed voltage thresholds to determine the signal state, but the voltage change of a sine wave is gradual, which does not match the switching characteristics of the switching circuit. Therefore, the transistor may not accurately reflect the changes in the sine wave signal, leading to inaccurate or distorted signal detection. Utility Model Content
[0005] Therefore, it is necessary to provide a signal processing circuit, a signal generating device, and a receiving signal detection device that can detect multiple input signals and are easy to detect.
[0006] In a first aspect, this application provides a signal processing circuit, comprising:
[0007] The signal processing module is connected to the signal output module. It is used to acquire the first signal output by the signal output module, process the first signal, and output a second signal. The signal processing module includes an input terminal, an output terminal, and a first diode. The positive terminal of the first diode is connected to the output terminal of the signal processing module, and the negative terminal of the first diode is connected to the input terminal of the signal processing module. The output terminal of the signal processing module is connected to the pull-up power supply through a first resistor, and the input terminal of the signal processing module is grounded.
[0008] In one exemplary embodiment, the signal processing circuit further includes a voltage divider protection module, the first terminal of which is connected to the input terminal of the signal processing module, and the second terminal of which is grounded.
[0009] In one exemplary embodiment, the voltage divider protection module includes a second resistor, the first end of which is connected to the input terminal of the signal processing module, and the second end of which is grounded.
[0010] In an exemplary embodiment, the voltage divider protection module further includes a first transistor and a third resistor. The negative terminal of the first diode and the first terminal of the second resistor are both connected to the first terminal of the third resistor. The second terminal of the third resistor is connected to the base of the first transistor. The emitter of the first transistor is grounded. The collector of the first transistor is connected to the signal output module.
[0011] In an exemplary embodiment, the input terminal of the signal processing module is connected to a first filtering module. The first filtering module includes a fourth resistor and a first capacitor. The first end of the fourth resistor is connected to the output terminal of the signal output module, the second end of the fourth resistor is connected to the input terminal of the signal processing module, the first end of the first capacitor is connected to the second end of the fourth resistor, and the second end of the first capacitor is grounded.
[0012] In one exemplary embodiment, the output of the signal processing module is connected to an ADC sampling circuit.
[0013] In an exemplary embodiment, a second filtering module is connected between the output of the signal processing module and the ADC sampling circuit. The second filtering module includes a fifth resistor, a sixth resistor, and a second capacitor. The first end of the fifth resistor is connected to the output of the signal processing module, and the second end of the fifth resistor is connected to the input of the ADC sampling circuit. The first end of the sixth resistor is connected to the second end of the fifth resistor, and the second end of the fifth resistor is also connected to the first end of the second capacitor. The second ends of the sixth resistor and the second ends of the second capacitor are both grounded.
[0014] In an exemplary embodiment, the second filtering module further includes a second diode and a third diode, the negative terminal of the second diode and the positive terminal of the third diode are both connected to the second end of the fifth resistor, the positive terminal of the second diode is grounded, and the negative terminal of the third diode is connected to the clamping power supply.
[0015] Secondly, this application provides a signal generating apparatus, including any of the embodiments described above.
[0016] Thirdly, this application provides a receiving signal detection device.
[0017] The aforementioned signal processing circuit, signal generating device, and signal receiving and detection device effectively process the received first signal and output a processed second signal. Simultaneously, a first diode and a first resistor are configured. When an input signal is received, the voltage at the negative terminal of the first diode increases or decreases, causing the voltage at the first resistor to decrease or increase, thus changing the voltage at the positive terminal of the first diode with the input. Furthermore, the inclusion of the first diode ensures that the signal flows in only one direction during processing, helping to prevent reverse interference. The output terminal of the signal processing module is connected to a pull-up power supply, which can improve the output signal level, ensuring clarity and recognizability during transmission. It can also receive a wider variety of first signals, detect negative signals, and is suitable for various operating conditions. The output second signal maintains consistency and timeliness with the input signal, facilitating detection. Attached Figure Description
[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0019] Figure 1 This is a circuit diagram of a signal processing circuit according to an embodiment of this application;
[0020] Figure 2 This is a circuit diagram of a signal processing circuit according to another embodiment of this application;
[0021] Figure 3 This is a circuit diagram of a signal processing circuit according to another embodiment of this application;
[0022] Figure 4 This is a circuit diagram of a signal processing circuit according to another embodiment of this application;
[0023] Figure 5 This is a circuit diagram of a signal processing circuit according to another embodiment of this application.
[0024] Explanation of reference numerals in the attached figures:
[0025] D1: First diode, D2: Second diode, D3: Third diode;
[0026] R1: First resistor, R2: Second resistor, R3: Third resistor, R4: Fourth resistor, R5: Fifth resistor, R6: Sixth resistor;
[0027] C1: First capacitor, C2: Second capacitor;
[0028] Q1: The first transistor. Detailed Implementation
[0029] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.
[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
[0031] It is understood that the terms "first," "second," etc., used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.
[0032] It is understood that the term "connection" in the following embodiments should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have electrical signal or data transmission with each other.
[0033] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising,” “including,” or “having,” etc., specify the presence of the stated feature, whole, step, operation, component, part, or combination thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.
[0034] See Figure 1 , Figure 1A circuit diagram of a signal processing circuit according to an embodiment of this application is shown. The signal processing circuit includes a signal processing module connected to a signal output module, and the signal processing module receives a first signal output by the signal output module. The signal processing module includes an input terminal, an output terminal, and a first diode D1. The anode of the first diode D1 is connected to the output terminal of the signal processing module, and the cathode of the first diode D1 is connected to the input terminal of the signal processing module. The output terminal of the signal processing module is connected to a pull-up power supply through a first resistor R1, and the input terminal of the signal processing module is grounded.
[0035] The pull-up power supply voltage is equal to the sum of the voltage at the cathode of the first diode D1, the voltage drop across the first diode D1, and the voltage drop across the first resistor R1. The diode can be simply understood as a wire, and wires have a certain voltage drop. The voltage at the cathode of the first diode D1 is equal to the voltage of the first signal output by the signal output module.
[0036] When the input signal is positive, the first diode D1 in the circuit begins to conduct, and the voltage at its negative terminal begins to rise. This causes the voltage across the first resistor R1 to decrease, while the voltage at the positive terminal of the first diode D1 also increases. Therefore, when the input signal is positive, the second signal at the positive terminal of the first diode D1 changes with the input signal. Conversely, when the input signal is negative, the first diode D1 in the circuit is cut off, and the voltage at its negative terminal begins to decrease. At this time, the voltage across the first resistor R1 increases, while the voltage at the positive terminal of the first diode D1 also decreases. Therefore, when the input signal is negative, the second signal at the positive terminal of the first diode D1 also changes with the input signal. Specifically, when the first signal is positive, the voltage at the negative terminal of the first diode D1 increases, causing its positive terminal voltage to also increase, and the voltage across the first resistor R1 decreases; while when the first signal is negative, the voltage at the negative terminal of the first diode D1 decreases, the voltage at the positive terminal of the first diode D1 also decreases, and the voltage across the first resistor R1 increases.
[0037] In the aforementioned signal processing circuit, the received first signal is effectively processed to output a processed second signal. Simultaneously, a first diode D1 and a first resistor R1 are configured. When an input signal is received, the voltage at the negative terminal of the first diode D1 increases or decreases, causing the voltage at the first resistor R1 to decrease or increase. This results in the voltage at the positive terminal of the first diode D1 changing with the input. Furthermore, the configuration of the first diode D1 ensures that the signal flows in only one direction during processing, which helps prevent reverse interference. The output terminal of the signal processing module is connected to a pull-up power supply, which can improve the output signal level, ensuring clarity and recognizability during signal transmission. It can also receive a wider variety of first signals, detect negative signals, and is suitable for various operating conditions. The output second signal maintains consistency and timeliness with the input signal, facilitating detection.
[0038] When the input signal is positive, if the input signal is a sinusoidal signal, the potential at the positive terminal of the first diode D1 gradually changes with the output of the signal output module. When the voltage at the positive terminal of the first diode D1 increases, the voltage across the first resistor R1 decreases accordingly. Therefore, the voltage at the negative terminal of the first diode D1 increases as the voltage at the positive terminal increases. In other words, the potential at the positive terminal of the first diode D1 is raised with the sinusoidal / PWM signal, which in turn causes the potential at the negative terminal of the first diode D1 to rise accordingly. Thus, the second signal follows the change of the input signal when the input signal is positive.
[0039] Similarly, when the input signal is negative, if the voltage at the positive terminal of the first diode D1 decreases, the voltage across the first resistor R1 increases accordingly, and the voltage at the negative terminal of the first diode D1 decreases as the voltage at the positive terminal decreases.
[0040] Continue reading Figure 1 The signal processing circuit also includes a voltage divider protection module. The first terminal of the voltage divider protection module is connected to the input terminal of the signal processing module, and the second terminal of the voltage divider protection module is grounded. In one embodiment, see [reference needed]. Figure 2 , Figure 2 A circuit diagram of a signal processing circuit provided in another embodiment of this application is shown. The voltage divider protection module includes a second resistor R2. The first end of the second resistor R2 is connected to the input end of the signal processing module, and the second end of the second resistor R2 is grounded.
[0041] The signal processing module is the core of the circuit, responsible for receiving, processing, and outputting signals. Its internal structure includes an input terminal, an output terminal, and a first diode D1. The positive terminal of the first diode D1 is connected to the output terminal, while the negative terminal is connected to the input terminal, ensuring that the signal processing module can effectively process the first signal from the signal output module.
[0042] The first terminal of the voltage divider protection module is connected to the input terminal of the signal processing module, and the second terminal of the voltage divider protection module is grounded. The voltage divider protection module includes a second resistor R2, the first terminal of which is connected to the input terminal of the signal processing module, and the second terminal of which is grounded. By introducing the second resistor R2, it acts as a load for the input signal, preventing the input signal from being directly connected to ground. The input signal and R2 are connected in parallel, so when the input signal changes, according to Ohm's law U=IR, the current through R2 changes accordingly, and the voltage through R2 increases or decreases synchronously. The voltage through R2 is equal to the second signal.
[0043] See Figure 3 , Figure 3 The diagram shows a circuit diagram of a signal processing circuit provided in another embodiment of this application. The voltage divider protection module further includes a first transistor Q1 and a third resistor R3. The cathode of the first diode D1 and the first end of the second resistor R2 are both connected to the first end of the third resistor R3. The second end of the third resistor R3 is connected to the base of the first transistor Q1. The emitter of the first transistor Q1 is grounded. The collector of the first transistor Q1 is connected to the signal output module.
[0044] When the input signal is within the normal range, the first diode D1 is in the off state, allowing the first signal to pass smoothly without interference. At this time, the base of the first transistor Q1 does not receive drive current and remains in the off state, forming a high impedance state, which allows the subsequent circuit to work normally.
[0045] When the input signal exceeds the normal range, the first diode D1 is in the conducting state. The conducting first diode D1 feeds high voltage back to the base of the first transistor Q1, providing drive current. At this time, the first transistor Q1 receives the base drive current and quickly turns on, forming a low-impedance path, thereby guiding the excessively high input signal voltage to ground and preventing it from entering the subsequent circuit.
[0046] The conduction of the first transistor Q1 effectively shunted the excessive voltage, protecting the subsequent circuitry from damage. Furthermore, when the input voltage returns to a safe range, the first diode D1 will turn off again, and the first transistor Q1 will stop conducting, restoring the system to normal operation.
[0047] In this embodiment, by rationally designing circuit parameters, such as the diode's forward voltage and the resistor's resistance value, flexible protection against different input signals can be achieved, ensuring stable operation of the device even in complex environments. Therefore, utilizing the synergistic effect of transistors and diodes to construct an efficient protection circuit is crucial for improving system reliability.
[0048] See Figure 4 , Figure 4The diagram shows a circuit diagram of a signal processing circuit provided in another embodiment of this application. The input terminal of the signal processing module is connected to a first filtering module. The first filtering module includes a fourth resistor R4 and a first capacitor C1. The first end of the fourth resistor R4 is connected to the output terminal of the signal output module, the second end of the fourth resistor R4 is connected to the input terminal of the signal processing module, the first end of the first capacitor C1 is connected to the second end of the fourth resistor R4, and the second end of the first capacitor C1 is grounded.
[0049] When the signal output module generates the first signal, the first signal is transmitted to the first filter module through the connected cable. The fourth resistor R4 and the first capacitor C1 in the first filter module are connected in parallel to form a low-pass filter. The function of the low-pass filter is to allow low-frequency signals to pass through while suppressing high-frequency noise.
[0050] After filtering, when the input signal is positive, the first diode D1 in the circuit begins to conduct, and the voltage at its negative terminal begins to rise. This causes the voltage across the first resistor R1 to decrease, while the voltage at the positive terminal of the first diode D1 also increases. Therefore, when the input signal is positive, the second signal at the positive terminal of the first diode D1 changes with the input signal. Conversely, when the input signal is negative, the first diode D1 in the circuit is cut off, and the voltage at its negative terminal begins to decrease. At this time, the voltage across the first resistor R1 increases, while the voltage at the positive terminal of the first diode D1 also decreases. Therefore, when the input signal is negative, the second signal at the positive terminal of the first diode D1 also changes with the input signal.
[0051] In some embodiments, the output of the signal processing module is connected to an ADC sampling circuit. See also... Figure 5 , Figure 5 A circuit diagram of a signal processing circuit provided in another embodiment of this application is shown. A second filtering module is connected between the output terminal of the signal processing module and the ADC sampling circuit. The second filtering module includes a fifth resistor R5, a sixth resistor R6, and a second capacitor C2. The first end of the fifth resistor R5 is connected to the output terminal of the signal processing module, and the second end of the fifth resistor R5 is connected to the input terminal of the ADC sampling circuit. The first end of the sixth resistor R6 is connected to the second end of the fifth resistor R5, and the second end of the fifth resistor R5 is also connected to the first end of the second capacitor C2. The second ends of the sixth resistor R6 and the second ends of the second capacitor C2 are both grounded.
[0052] When the input signal is positive, the first diode D1 in the circuit begins to conduct, and the voltage at its negative terminal begins to rise. This causes the voltage across the first resistor R1 to decrease, while the voltage at the positive terminal of the first diode D1 also increases. Therefore, when the input signal is positive, the second signal at the positive terminal of the first diode D1 changes with the input signal. Conversely, when the input signal is negative, the first diode D1 in the circuit is turned off, and the voltage at its negative terminal begins to decrease. At this time, the voltage across the first resistor R1 increases, while the voltage at the positive terminal of the first diode D1 also decreases. Therefore, when the input signal is negative, the second signal at the positive terminal of the first diode D1 also changes with the input signal.
[0053] After outputting the second signal based on the change in the first signal, the second filtering module further filters and processes the second signal. It consists of a fifth resistor R5, a sixth resistor R6, and a second capacitor C2. The combination of these components enables signal filtering and impedance matching. The first end of the fifth resistor R5 is connected to the output of the signal processing module, and the second end is connected to the input of the ADC sampling circuit. This allows the signal to be introduced into the ADC sampling circuit for sampling and conversion.
[0054] Meanwhile, the second terminal of the fifth resistor R5 is connected to the first terminal of the sixth resistor R6, and the first terminal of the second capacitor C2 is connected to the second terminal of the fifth resistor R5. This connection method forms a low-pass filter structure to filter the signal, remove high-frequency noise and interference, and retain the main components of the signal. The second terminal of the sixth resistor R6 and the second terminal of the second capacitor C2 are grounded, which can effectively eliminate ground interference and improve the system's anti-interference capability.
[0055] In this embodiment, the second filtering module can effectively process and filter the signal, ensuring its accuracy and stability, and improving the system's performance and reliability. Simultaneously, proper circuit connections and component selection can also reduce distortion and errors during signal processing.
[0056] Continue reading Figure 5 The second filter module also includes a second diode D2 and a third diode D3. The negative terminal of the second diode D2 and the positive terminal of the third diode D3 are both connected to the second end of the fifth resistor R5. The positive terminal of the second diode D2 is grounded, and the negative terminal of the third diode D3 is connected to the clamping power supply.
[0057] When the input signal is positive, the first diode D1 in the circuit begins to conduct, and the voltage at its negative terminal begins to rise. This causes the voltage across the first resistor R1 to decrease, while the voltage at the positive terminal of the first diode D1 also increases. Therefore, when the input signal is positive, the second signal at the positive terminal of the first diode D1 changes with the input signal. Conversely, when the input signal is negative, the first diode D1 in the circuit is turned off, and the voltage at its negative terminal begins to decrease. At this time, the voltage across the first resistor R1 increases, while the voltage at the positive terminal of the first diode D1 also decreases. Therefore, when the input signal is negative, the second signal at the positive terminal of the first diode D1 also changes with the input signal.
[0058] After outputting the second signal based on the change in the first signal, the connection between the cathode of the second diode D2 and the anode of the third diode D3, and then connected to the second terminal of the fifth resistor R5, ensures effective filtering and voltage regulation of the second signal when passing through the combined structure of the second and third diodes D2 and D3. The anode of the second diode D2 is grounded, meaning one end of the second diode D2 is directly connected to the ground line, forming a stable reference voltage. This diode combination can guide noise and unwanted high-frequency signals in the circuit to the ground line, thereby reducing the impact of these interferences on the main signal. Simultaneously, the cathode of the third diode D3 is connected to the clamping power supply, providing a stable voltage source to ensure stable operation of the circuit even under high current conditions. The clamping power supply limits the signal amplitude, preventing the voltage from exceeding the circuit's safe operating range, thus protecting the circuit from damage caused by excessive voltage. Furthermore, the combined configuration of the second and third diodes D2 and D3, along with the fifth resistor R5, forms an effective filtering network.
[0059] In one embodiment, a signal generating device is also provided, the signal generating device comprising, for example, Figures 1 to 4 The signal processing circuit shown in any of the examples. The signal generating device may also include a signal generation module connected to the signal output module for generating the desired square wave PWM signal, sine / cosine variation signal, triangle wave signal, random signal, etc.
[0060] In one embodiment, a received signal detection device is also provided, which includes the signal processing circuit as described in any of the above embodiments. The received signal detection device further includes a signal receiving module for processing the second signal.
[0061] In the description of this specification, the references to terms such as "some embodiments," "other embodiments," "ideal embodiments," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example that are included in at least one embodiment or example of this application. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiments or examples.
[0062] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0063] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.
Claims
1. A signal processing circuit, characterized in that, include: A signal processing module, connected to a signal output module, is used to acquire a first signal output by the signal output module, process the first signal, and output a second signal. The signal processing module includes an input terminal, an output terminal, and a first diode. The anode of the first diode is connected to the output terminal of the signal processing module, and the cathode of the first diode is connected to the input terminal of the signal processing module. The output terminal of the signal processing module is connected to a pull-up power supply through a first resistor, and the input terminal of the signal processing module is grounded.
2. The signal processing circuit according to claim 1, characterized in that, The signal processing circuit further includes a voltage divider protection module, the first terminal of which is connected to the input terminal of the signal processing module, and the second terminal of which is grounded.
3. The signal processing circuit according to claim 2, characterized in that, The voltage divider protection module includes a second resistor, the first end of which is connected to the input terminal of the signal processing module, and the second end of which is grounded.
4. The signal processing circuit according to claim 3, characterized in that, The voltage divider protection module also includes a first transistor and a third resistor. The negative terminal of the first diode and the first end of the second resistor are both connected to the first end of the third resistor. The second end of the third resistor is connected to the base of the first transistor. The emitter of the first transistor is grounded. The collector of the first transistor is connected to the signal output module.
5. The signal processing circuit according to claim 1, characterized in that, The input terminal of the signal processing module is connected to a first filtering module. The first filtering module includes a fourth resistor and a first capacitor. The first end of the fourth resistor is connected to the output terminal of the signal output module, the second end of the fourth resistor is connected to the input terminal of the signal processing module, the first end of the first capacitor is connected to the second end of the fourth resistor, and the second end of the first capacitor is grounded.
6. The signal processing circuit according to claim 1, characterized in that, The output of the signal processing module is connected to an ADC sampling circuit.
7. The signal processing circuit according to claim 6, characterized in that, A second filtering module is connected between the output terminal of the signal processing module and the ADC sampling circuit. The second filtering module includes a fifth resistor, a sixth resistor, and a second capacitor. The first end of the fifth resistor is connected to the output terminal of the signal processing module, and the second end of the fifth resistor is connected to the input terminal of the ADC sampling circuit. The first end of the sixth resistor is connected to the second end of the fifth resistor, and the second end of the fifth resistor is also connected to the first end of the second capacitor. The second ends of the sixth resistor and the second ends of the second capacitor are both grounded.
8. The signal processing circuit according to claim 7, characterized in that, The second filtering module further includes a second diode and a third diode. The negative terminal of the second diode and the positive terminal of the third diode are both connected to the second end of the fifth resistor. The positive terminal of the second diode is grounded, and the negative terminal of the third diode is connected to the clamping power supply.
9. A signal generating device, characterized in that, Includes the signal processing circuit as described in any one of claims 1-5.
10. A receiving signal detection device, characterized in that, Includes the signal processing circuit as described in any one of claims 1-8.