PIN resistance measuring circuit, measuring method and measuring equipment

Abstract

The invention relates to the technical field of electronic measurement, in particular to a PIN resistance measuring circuit, a PIN resistance measuring method and PIN resistance measuring equipment. The circuit comprises a current source module, a sampling module and a signal conversion module, and the current source module is used for generating and outputting a constant current excitation signal; the sampling module is used for sampling the constant current excitation signal output by the current source module; the signal conversion module is configured to respond to a to-be-tested load output voltage signal, enter a sampling integration stage, and perform integration conversion on the voltage signal in a preset charging time window to obtain a first clock pulse number; and in response to cut-off of the charging time window, entering a negative integration stage, accessing a reference voltage signal, discharging based on the reference voltage signal to obtain discharging window time and a second clock pulse number, and determining a resistance measurement value of the to-be-measured load according to the reference voltage signal, the first time pulse number and the second clock pulse number. According to the circuit, the accuracy and the stability of PIN resistance measurement can be improved.

Description

Technical Field

[0001] This application relates to the field of electronic measurement technology, and in particular to a PIN pin resistance measurement circuit, measurement method, and measurement device. Background Technology

[0002] In the field of electronic connectors and precision testing, POGO BLOCK (also known as a spring probe test module) is a high-frequency contact component widely used in circuit testing, semiconductor inspection, and PCB board verification. The conductivity of its core component, the PIN (spring probe), directly affects the transmission quality of the test signal, and conductivity resistance is one of the key parameters for measuring its performance. As the core conductive component of the POGO BLOCK, the resistance value of the PIN directly affects the integrity and stability of the test signal. Excessive contact resistance can lead to signal attenuation, increased voltage drop, and even false tests or equipment failure. Especially in high-speed signal testing (such as high-frequency PCB or chip testing), even small resistance fluctuations can cause signal reflection or noise interference, seriously affecting the reliability of test results. Therefore, ensuring that the resistance value of the PIN meets design standards (usually requiring levels as low as milliohms) is fundamental to guaranteeing the performance of the test system. Traditionally, PIN resistance measurement relies on manual operation of multimeters or simple testing equipment, but this method suffers from low efficiency, poor consistency, and susceptibility to interference, making it difficult to meet the demands of modern high-precision, large-scale automated testing. Therefore, the use of automated measuring equipment to measure PIN pins in order to improve the accuracy, stability and efficiency of PIN pin resistance detection has been widely adopted.

[0003] In related technologies, automated equipment typically uses a high-precision constant current source and a four-wire measurement method to separate the current application and voltage detection circuits, thereby eliminating the influence of wire resistance and enabling the measurement of small resistances.

[0004] However, current methods for measuring the resistance of PIN pins have the following technical problems:

[0005] Automated measuring equipment is usually equipped with high-power motors or other high-power devices. On the one hand, motors have a large leakage flux, which usually affects the surrounding electronic equipment. On the other hand, other high-power devices can also cause significant pollution to the equipment grounding, thus affecting the accuracy of weak signal extraction of precision measuring instruments, resulting in poor measurement accuracy and repeatability, which needs to be optimized. Summary of the Invention

[0006] Therefore, it is necessary to provide a PIN pin resistance measurement circuit, measurement method, and measurement device that can improve the accuracy and stability of PIN pin resistance measurement.

[0007] This application provides a PIN pin resistance measurement circuit, including:

[0008] A current source module has an output terminal, and the current source module is used to generate and output a constant current excitation signal;

[0009] A sampling module has an input terminal and an output terminal. The input terminal of the sampling module is coupled to the output terminal of the current source module, and the output terminal of the sampling module is coupled to the first terminal of the load under test. The sampling module is used to sample the constant current excitation signal output by the current source module.

[0010] The signal conversion module has a first input terminal, a second input terminal, and an output terminal. The first input terminal of the signal conversion module is coupled to the second terminal of the load under test, and the second input terminal of the signal conversion module is coupled to a reference signal source.

[0011] The signal conversion module is configured to, in response to the output voltage signal of the load under test, enter a sampling integration stage, integrate and convert the voltage signal within a preset charging time window to obtain a first clock pulse count; in response to the end of the charging time window, the signal conversion module enters a negative integration stage, connects to a reference voltage signal, discharges based on the reference voltage signal to obtain a discharge window time and a second clock pulse count, and determines the resistance measurement value of the load under test based on the reference voltage signal, the first time pulse count, and the second clock pulse count.

[0012] In one embodiment, the signal conversion module includes:

[0013] The integrator unit is used to perform integral conversion between voltage signals and time signals;

[0014] A switching unit has a first input terminal, a second input terminal, and an output terminal. The first input terminal of the switching unit is coupled to the second terminal of the load under test, the second input terminal of the switching unit is coupled to the reference signal source, and the output terminal of the switching unit is coupled to the input terminal of the integrator unit. The switching unit is used to realize the state switching of the signal conversion module.

[0015] In one embodiment, the signal conversion module further includes:

[0016] The signal amplification unit has an input terminal and an output terminal. The input terminal of the signal amplification unit is coupled to the output terminal of the switching unit, and the output terminal of the signal amplification unit is coupled to the input terminal of the integrator unit. The signal amplification unit is used to amplify the voltage signal flowing through the loop.

[0017] In one embodiment, the signal conversion module further includes:

[0018] The counter unit is used to convert the time signal measured by the signal conversion module into a clock pulse signal based on a preset counting frequency.

[0019] In one embodiment, the current source module includes:

[0020] The power supply unit is used to provide power supply support for the current source module;

[0021] A constant current output unit, connected to the power supply unit, is used to convert the power supply signal provided by the power supply unit into the constant current excitation signal and output it.

[0022] In one embodiment, the power supply unit is implemented based on an isolated power supply.

[0023] In one embodiment, the current source module further includes:

[0024] A linear voltage regulator unit has an input terminal and an output terminal. The input terminal of the linear voltage regulator unit is coupled to the output terminal of the power supply unit, and the output terminal of the linear voltage regulator unit is coupled to the input terminal of the constant current output unit. The linear voltage regulator unit is used to convert the power supply signal output by the power supply unit from a switching voltage to a linear voltage.

[0025] In one embodiment, the measurement circuit further includes:

[0026] A conversion output module, connected to the signal conversion module, is used to acquire the resistance measurement value of the load under test measured by the signal conversion module and convert and output it. The conversion output includes converting the resistance measurement value into data output in a preset encoding format.

[0027] Secondly, this application also provides a method for measuring PIN resistance, the method comprising the following steps:

[0028] In response to the output voltage signal of the load under test, the voltage signal is acquired;

[0029] The voltage signal is integrated and converted within a preset charging time window, and the charging time window is clocked based on a preset clock frequency to obtain the first clock pulse count.

[0030] In response to the end of the charging time window, a reference voltage signal is connected, and discharge is performed based on the reference voltage signal. The discharge window time is determined, and the discharge time window is clocked based on the preset clock frequency to obtain the second clock pulse count.

[0031] The resistance measurement value of the load under test is determined based on the reference voltage signal, the first time pulse count, and the second clock pulse count.

[0032] Thirdly, embodiments of this application also provide a PIN pin resistance measuring device, including a PIN pin resistance measuring circuit according to any one of the first aspects, wherein the measuring device implements a PIN pin resistance measuring method as described in the second aspect.

[0033] The aforementioned PIN pin resistance measurement circuit, derived from the technical features in the claims, can achieve the following beneficial effects in addressing the technical problems raised in the background art:

[0034] This application provides a PIN pin resistance measurement circuit, including a current source module, a sampling module, and a signal conversion module. The current source module has an output terminal and is used to generate and output a constant current excitation signal. The sampling module has an input terminal and an output terminal; the input terminal of the sampling module is coupled to the output terminal of the current source module, and the output terminal of the sampling module is coupled to a first terminal of the load under test. The sampling module is used to sample the constant current excitation signal output by the current source module. The signal conversion module has a first input terminal, a second input terminal, and an output terminal; the first input terminal of the signal conversion module is coupled to the second terminal of the load under test. The second input terminal of the signal conversion module is coupled to a reference signal source. The signal conversion module is configured to, in response to the output voltage signal of the load under test, enter a sampling integration stage, integrating and converting the voltage signal within a preset charging time window to obtain a first clock pulse count. In response to the end of the charging time window, the signal conversion module enters a negative integration stage, connecting to a reference voltage signal and discharging based on the reference voltage signal to obtain a discharge window time and a second clock pulse count. The resistance measurement value of the load under test is determined based on the reference voltage signal, the first clock pulse count, and the second clock pulse count. In practice, conventional automated measurement equipment suffers from electromagnetic leakage interference caused by high-power motors or other high-power equipment, and ground potential fluctuations caused by high-power devices leading to ground wire contamination, resulting in measurement errors. This application's solution addresses these issues through a constant current excitation + dual-integration ADC architecture. The current source module provides a stable excitation current, which helps reduce excitation fluctuations caused by changes in contact resistance of the voltage source, enhancing the stability of the test signal. The dual-slope integration signal conversion module performs a fixed-time integration conversion of the voltage across the load under test (i.e., the PIN pin) during the sampling integration phase, thereby averaging out noise and effectively suppressing high-frequency noise. Subsequently, a reverse discharge is performed using a reference voltage as a reference during the negative integration phase, ensuring that the resistance measurement result is only correlated to the reference voltage value and clock accuracy. By using the same clock and the same integrator, component errors caused by devices are eliminated, ultimately improving the resistance measurement's immunity to EMI and ground interference, and enhancing the accuracy of the resistance measurement. Attached Figure Description

[0035] 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.

[0036] Figure 1This is a schematic diagram of the architecture of a PIN pin resistance measurement circuit in an embodiment of this application;

[0037] Figure 2 This is a schematic diagram of the signal conversion module architecture in an embodiment of this application;

[0038] Figure 3 This is a schematic diagram of the architecture of the current source module in an embodiment of this application;

[0039] Figure 4 This is a flowchart illustrating a PIN pin resistance measurement method according to an embodiment of this application.

[0040] Explanation of reference numerals in the attached diagram: 100, Current source module; 110, Power supply unit; 120, Constant current output unit; 130, Linear voltage regulator unit; 200, Sampling module; 300, Signal conversion module; 310, Integrator unit; 320, Switching unit; 330, Signal amplification unit; 340, Counter unit; 400, Load under test; 500, Reference signal source; 600, Conversion output module. Detailed Implementation

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] It is understandable that "at least one" refers to one or more, and "multiple" refers to two or more. "At least a part of an element" refers to part or all of an element.

[0046] 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 features, wholes, steps, operations, components, parts, or combinations 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. Meanwhile, the term “and / or” as used in this specification includes any and all combinations of the associated listed items.

[0047] This application was made by the inventor based on his understanding and research into the following issues:

[0048] In related technologies, automated equipment typically uses a high-precision constant current source and a four-wire measurement method to separate the current application and voltage detection circuits, thereby eliminating the influence of wire resistance and enabling the measurement of small resistances.

[0049] However, current methods for measuring the resistance of PIN pins have the following technical problems:

[0050] Automated measuring equipment is usually equipped with high-power motors or other high-power devices. On the one hand, motors have a large leakage flux, which usually affects the surrounding electronic equipment. On the other hand, other high-power devices can also cause significant pollution to the equipment grounding, thus affecting the accuracy of weak signal extraction of precision measuring instruments, resulting in poor measurement accuracy and repeatability, which needs to be optimized.

[0051] To address the aforementioned problems, this application provides a PIN pin resistance measurement circuit. The PIN pin resistance measurement circuit provided in this application can, as follows: Figure 1 As shown, it includes: a current source module 100, a sampling module 200, and a signal conversion module 300.

[0052] The current source module 100 has an output terminal, and the current source module 100 is used to generate and output a constant current excitation signal.

[0053] The sampling module 200 has an input terminal and an output terminal. The input terminal of the sampling module 200 is coupled to the output terminal of the current source module 100, and the output terminal of the sampling module 200 is coupled to the first terminal of the load under test 400. The sampling module 200 is used to sample the constant current excitation signal output by the current source module 100.

[0054] The signal conversion module 300 has a first input terminal, a second input terminal, and an output terminal. The first input terminal of the signal conversion module 300 is coupled to the second terminal of the load under test 400, and the second input terminal of the signal conversion module 300 is coupled to the reference signal source 500.

[0055] Specifically, the signal conversion module 300 is configured to, in response to the output voltage signal of the load under test 400, enter a sampling integration stage, and perform integration conversion on the voltage signal within a preset charging time window to obtain a first clock pulse count; in response to the end of the charging time window, the signal conversion module 300 enters a negative integration stage, and the signal conversion module 300 connects to a reference voltage signal, discharges based on the reference voltage signal, obtains a discharge window time and a second clock pulse count, and determines the resistance measurement value of the load under test 400 based on the reference voltage signal, the first time pulse count and the second clock pulse count.

[0056] For example, the signal conversion module 300 can be divided into three stages of processing during operation. First, in the sampling and integration stage, the input voltage is charged within the charging window time T1, causing the integrator output to rise linearly, with the voltage amplitude proportional to the input voltage. Simultaneously, a counter records the first clock pulse count N1. Then, after the charging window time ends, the signal conversion module 300 switches to discharging based on the reference voltage signal (Vref), at which point the integrator output decreases linearly. The discharge window time T2 is proportional to the reference voltage signal (Vref), and a counter records the second clock pulse count N2. Finally, the signal conversion module 300 can output a digital value D = (N2 / N1)·Vref representing the measured resistance value of the load under test 400, achieving voltage-time-digital conversion.

[0057] By implementing the above-described PIN pin resistance measurement circuit, the following beneficial effects can be achieved:

[0058] This application provides a PIN pin resistance measurement circuit, including a current source module 100, a sampling module 200, and a signal conversion module 300. The current source module 100 has an output terminal and is used to generate and output a constant current excitation signal. The sampling module 200 has an input terminal and an output terminal. The input terminal of the sampling module 200 is coupled to the output terminal of the current source module 100, and the output terminal of the sampling module 200 is coupled to a first terminal of a load under test 400. The sampling module 200 is used to sample the constant current excitation signal output by the current source module 100. The signal conversion module 300 has a first input terminal, a second input terminal, and an output terminal. The first input terminal of the signal conversion module 300 is coupled to the load under test 400. The second input terminal of the signal conversion module 300 is coupled to the reference signal source 500. The signal conversion module 300 is configured to, in response to the output voltage signal of the load under test 400, enter a sampling integration stage, integrating and converting the voltage signal within a preset charging time window to obtain a first clock pulse count. In response to the end of the charging time window, the signal conversion module 300 enters a negative integration stage, connecting to a reference voltage signal and discharging based on the reference voltage signal to obtain a discharge window time and a second clock pulse count. The resistance measurement value of the load under test 400 is determined based on the reference voltage signal, the first clock pulse count, and the second clock pulse count. In practice, conventional automated measurement equipment suffers from electromagnetic leakage interference caused by high-power motors or other high-power equipment, and ground potential fluctuations caused by high-power devices leading to ground wire pollution, resulting in measurement errors. This application addresses the aforementioned issues through a constant current excitation + dual-integration ADC architecture. The current source module 100 provides a stable excitation current, helping to reduce excitation fluctuations caused by changes in contact resistance of the voltage source and enhancing the stability of the test signal. The dual-integration signal conversion module 300 performs a fixed-time integration conversion of the voltage across the load under test 400 (i.e., the PIN pin) during the sampling integration phase, thereby averaging noise and effectively suppressing high-frequency noise. Subsequently, a reverse discharge is performed using a reference voltage as a reference during the negative integration phase, ensuring that the resistance measurement result is only correlated to the reference voltage value and clock accuracy. Using the same clock and the same integrator eliminates component errors caused by devices, ultimately improving the resistance measurement's immunity to EMI and ground interference, and enhancing the accuracy of the resistance measurement.

[0059] In one embodiment, such as Figure 2 As shown, the signal conversion module 300 includes an integrator unit 310 and a switching unit 320.

[0060] The integrator unit 310 is used to perform integral conversion between voltage signals and time signals;

[0061] The switching unit 320 has a first input terminal, a second input terminal, and an output terminal. The first input terminal of the switching unit 320 is coupled to the second terminal of the load under test 400, the second input terminal of the switching unit 320 is coupled to the reference signal source 500, and the output terminal of the switching unit 320 is coupled to the input terminal of the integrator unit 310. The switching unit 320 is used to realize the state switching of the signal conversion module 300.

[0062] In this embodiment, the signal conversion module 300 is specifically composed of an integrator unit 310 and a switching unit 320. The switching unit 320 realizes the switching of the integrator input signal, which helps to reduce the complexity of the module circuit, thereby reducing the interference caused by the device and helping to improve the stability and accuracy of resistance measurement.

[0063] In one embodiment, such as Figure 2 As shown, the signal conversion module 300 further includes:

[0064] The signal amplification unit 330 has an input terminal and an output terminal. The input terminal of the signal amplification unit 330 is coupled to the output terminal of the switching unit 320, and the output terminal of the signal amplification unit 330 is coupled to the input terminal of the integrator unit 310. The signal amplification unit 330 is used to amplify the voltage signal flowing through the loop.

[0065] In this embodiment, a signal amplification unit 330 is provided in the signal conversion module 300, which helps to amplify the small detection signal to the required voltage that meets the processing requirements of the integrator unit 310, thereby improving the flexibility of resistance measurement.

[0066] In one embodiment, the signal conversion module 300 further includes:

[0067] The counter unit 340 is used to convert the time signal measured by the signal conversion module 300 into a clock pulse signal based on a preset counting frequency.

[0068] In this embodiment, the signal conversion module 300 counts the charging and discharging time window through a unified counter unit 340, which helps to improve the consistency of the counting reference and thus improve the accuracy of resistance measurement.

[0069] In one embodiment, such as Figure 3 As shown, the current source module 100 includes a power supply unit 110 and a constant current output unit 120.

[0070] The power supply unit 110 is used to provide power supply support for the current source module 100.

[0071] The constant current output unit 120 is connected to the power supply unit 110 and is used to convert the power supply signal provided by the power supply unit 110 into the constant current excitation signal and output it.

[0072] In this embodiment, the current source module 100 specifically includes a power supply unit 110 and a constant current output unit 120. The constant current output unit 120 converts the power supply signal of the power supply unit 110, which helps to realize the output of a specific constant current excitation signal and improves the flexibility of power supply output.

[0073] In one embodiment, the power supply unit 110 is implemented based on an isolated power supply.

[0074] In this embodiment, the power supply unit 110 is implemented based on an isolated power supply, which helps to realize a power system architecture with no direct electrical connection between the input and output circuits. This helps to block common-mode interference and ground loop noise, thereby ensuring signal stability. In addition, it can also realize the conversion and output of energy between different voltage domains.

[0075] In one embodiment, such as Figure 3 As shown, the current source module 100 further includes a linear voltage regulator unit 130.

[0076] The linear voltage regulator unit 130 has an input terminal and an output terminal. The input terminal of the linear voltage regulator unit 130 is coupled to the output terminal of the power supply unit 110, and the output terminal of the linear voltage regulator unit 130 is coupled to the input terminal of the constant current output unit 120. The linear voltage regulator unit 130 is used to convert the power supply signal output by the power supply unit 110 from a switching voltage to a linear voltage.

[0077] In this embodiment, the current source module 100 is equipped with a linear voltage regulator unit 130. The linear voltage regulator unit 130 converts the switching voltage into a linear voltage, which helps to reduce noise interference and further improves the stability of resistance measurement.

[0078] In one embodiment, the measurement circuit further includes:

[0079] The conversion output module 600 is connected to the signal conversion module 300 and is used to acquire the resistance measurement value of the load under test 400 measured by the signal conversion module 300 and convert and output it. The conversion output includes converting the resistance measurement value into data output in a preset encoding format.

[0080] For example, the preset encoding format may include BCD encoding, etc.

[0081] For example, the conversion output module 600 can output the measured resistance value in BCD encoding format for direct display on a digital display device such as a digital tube. The system can also convert the BCD-encoded resistance value output via software into computer-readable binary data, enabling the resistance measurement value to be processed by software.

[0082] In this embodiment, the resistance measurement value is converted and output, which helps to improve the data processing flexibility of resistance measurement.

[0083] Based on the same inventive concept, embodiments of this application also provide a PIN resistance measurement method, which can be as follows: Figure 4 As shown, the steps include the following:

[0084] Step 402: In response to the output voltage signal of the load under test, acquire the voltage signal.

[0085] Step 404: Integrate and convert the voltage signal within a preset charging time window, and count the clock pulses of the charging time window based on a preset clock frequency to obtain the first clock pulse count.

[0086] Step 406: In response to the closing of the charging time window, a reference voltage signal is connected, and discharge is performed based on the reference voltage signal. The discharge window time is determined, and the discharge time window is clocked based on the preset clock frequency to obtain the second clock pulse count.

[0087] Step 408: Determine the resistance measurement value of the load under test based on the reference voltage signal, the first time pulse count, and the second clock pulse count.

[0088] Based on the same inventive concept, this application also provides a PIN pin resistance measuring device, including a PIN pin resistance measuring circuit according to any one of the above embodiments, wherein the measuring device implements a PIN pin resistance measuring method as described in the above embodiments.

[0089] It is understood that the PIN pin resistance measurement circuit described above can also take other forms, and is not limited to the forms mentioned in the above embodiments, as long as it can achieve the function of improving the accuracy of resistance measurement.

[0090] In the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is 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.

[0091] 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.

[0092] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this 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 modifications and improvements all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A PIN pin resistance measurement circuit, characterized in that, include: A current source module has an output terminal, and the current source module is used to generate and output a constant current excitation signal; A sampling module has an input terminal and an output terminal. The input terminal of the sampling module is coupled to the output terminal of the current source module, and the output terminal of the sampling module is coupled to the first terminal of the load under test. The sampling module is used to sample the constant current excitation signal output by the current source module. The signal conversion module has a first input terminal, a second input terminal, and an output terminal. The first input terminal of the signal conversion module is coupled to the second terminal of the load under test, and the second input terminal of the signal conversion module is coupled to a reference signal source. The signal conversion module is configured to respond to the output voltage signal of the load under test. The signal conversion module enters the sampling and integration stage and performs integration and conversion on the voltage signal within a preset charging time window to obtain the first clock pulse count. In response to the expiration of the charging time window, the signal conversion module enters the negative integration stage. The signal conversion module receives a reference voltage signal and discharges based on the reference voltage signal to obtain the discharge window time and the second clock pulse count. The resistance measurement value of the load under test is determined based on the reference voltage signal, the first time pulse count, and the second clock pulse count.

2. The PIN pin resistance measuring circuit according to claim 1, characterized in that, The signal conversion module includes: The integrator unit is used to perform integral conversion between voltage signals and time signals; A switching unit has a first input terminal, a second input terminal, and an output terminal. The first input terminal of the switching unit is coupled to the second terminal of the load under test, the second input terminal of the switching unit is coupled to the reference signal source, and the output terminal of the switching unit is coupled to the input terminal of the integrator unit. The switching unit is used to realize the state switching of the signal conversion module.

3. The PIN pin resistance measuring circuit according to claim 2, characterized in that, The signal conversion module further includes: The signal amplification unit has an input terminal and an output terminal. The input terminal of the signal amplification unit is coupled to the output terminal of the switching unit, and the output terminal of the signal amplification unit is coupled to the input terminal of the integrator unit. The signal amplification unit is used to amplify the voltage signal flowing through the loop.

4. A PIN pin resistance measuring circuit according to claim 2, characterized in that, The signal conversion module further includes: The counter unit is used to convert the time signal measured by the signal conversion module into a clock pulse signal based on a preset counting frequency.

5. A PIN pin resistance measuring circuit according to claim 1, characterized in that, The current source module includes: The power supply unit is used to provide power supply support for the current source module; A constant current output unit, connected to the power supply unit, is used to convert the power supply signal provided by the power supply unit into the constant current excitation signal and output it.

6. A PIN pin resistance measuring circuit according to claim 5, characterized in that, The power supply unit is implemented based on an isolated power supply.

7. A PIN pin resistance measuring circuit according to claim 5, characterized in that, The current source module also includes: A linear voltage regulator unit has an input terminal and an output terminal. The input terminal of the linear voltage regulator unit is coupled to the output terminal of the power supply unit, and the output terminal of the linear voltage regulator unit is coupled to the input terminal of the constant current output unit. The linear voltage regulator unit is used to convert the power supply signal output by the power supply unit from a switching voltage to a linear voltage.

8. A PIN pin resistance measuring circuit according to claim 1, characterized in that, The measurement circuit also includes: A conversion output module, connected to the signal conversion module, is used to acquire the resistance measurement value of the load under test measured by the signal conversion module and convert and output it. The conversion output includes converting the resistance measurement value into data output in a preset encoding format.

9. A method for measuring PIN resistance, characterized in that, The method includes the following steps: In response to the output voltage signal of the load under test, the voltage signal is acquired; The voltage signal is integrated and converted within a preset charging time window, and the charging time window is clocked based on a preset clock frequency to obtain the first clock pulse count. In response to the end of the charging time window, a reference voltage signal is connected, and discharge is performed based on the reference voltage signal. The discharge window time is determined, and the discharge time window is clocked based on the preset clock frequency to obtain the second clock pulse count. The resistance measurement value of the load under test is determined based on the reference voltage signal, the first time pulse count, and the second clock pulse count.

10. A PIN pin resistance measuring device, characterized in that, The measuring device includes a PIN pin resistance measuring circuit according to any one of claims 1-8, and in practice implements a PIN pin resistance measuring method as described in claim 9.

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