Multi-channel signal isolation and anti-interference device and system for digital-analog hybrid test

Abstract

The invention relates to the technical field of digital-analog hybrid testing, and discloses a multichannel signal isolation and anti-interference device and system for digital-analog hybrid testing. The system comprises a plurality of signal channels, a plurality of signal isolation modules, a plurality of signal acquisition modules, a self-detection module and a signal analysis control module, the signal isolation modules are in one-to-one correspondence with the signal channels, so that signals of the channels can be effectively isolated, and the test accuracy is guaranteed; the signal acquisition module corresponds to the channel and provides rich basis for testing; the self-detection module detects the signal isolation modules according to a preset rule before the test, and obtains self-detection signal information data through the acquisition module, so that the normal work of each isolation module before the formal test can be ensured, and the test data distortion or interference caused by module faults can be avoided; the signal analysis control module analyzes the self-detection data, obtains an isolation state level and judges whether the module is abnormal or not, problems can be found and processed in time, and the test efficiency and reliability are improved.

Description

Technical Field

[0001] This invention relates to the field of mixed-signal testing technology, and specifically to a multi-channel signal isolation and anti-interference device and system for mixed-signal testing. Background Technology

[0002] With the advancement of semiconductor process technology, chip area is constantly shrinking while functions are becoming increasingly complex, making mixed-signal chips the mainstream. Mixed-signal integrated circuit test systems, as key electronic measurement instruments for testing the performance of mixed-signal chips, combine digital and analog signal testing capabilities. During mixed-signal testing, because digital and analog signals coexist in the system, digital signals generate high-frequency noise and electromagnetic interference during transmission and processing. These interferences can easily couple into the analog signal channel. Analog signals themselves are extremely sensitive to noise and interference; even minor interference can lead to signal distortion, thereby affecting the performance and accuracy of the entire system.

[0003] In existing technologies, to effectively solve the common signal isolation problem and the impact of external interference on signal quality in multi-channel signal processing, most multi-channel signal processing devices adopt relatively simple and direct physical isolation methods. For example, they use independent shielded cables and block external electromagnetic interference through the metal shielding layer on the outside of the cables, thus building a relatively independent transmission channel for each signal channel. Alternatively, they use simple isolation circuits, which use isolation elements in the circuit to electrically separate each signal channel, thereby achieving isolation of each signal channel.

[0004] However, existing multi-channel signal processing devices lack a real-time monitoring and evaluation mechanism for signal isolation status. This makes it impossible to detect potential faults or performance degradation of the isolation module in a timely manner. Once an isolation module of a certain signal channel malfunctions, the interference signal will continue to affect other channels because it cannot be detected and dealt with in time, ultimately distorting the entire test results and potentially causing system failure. Summary of the Invention

[0005] The purpose of this invention is to provide a multi-channel signal isolation and anti-interference device and system for mixed-signal testing, solving the following technical problems: How to optimize multi-channel signal isolation and anti-interference devices and systems for mixed-signal testing.

[0006] The objective of this invention can be achieved through the following technical solutions: A multi-channel signal isolation and anti-interference system for mixed-signal testing, the system comprising multiple signal channels, multiple signal isolation modules, multiple signal acquisition modules, a self-testing module, and a signal analysis and control module; The signal isolation module corresponds one-to-one with the signal channel and is used to isolate the signal in the corresponding signal channel from the signals in other signal channels; The signal acquisition module corresponds one-to-one with the signal channel and is used to acquire signal information data in the corresponding signal channel. The self-testing module is used to test the signal isolation modules of each signal channel according to preset testing rules before performing mixed-signal testing on the external chip, and to acquire the self-testing signal information data of each signal channel through the signal acquisition module. The signal analysis and control module is used to analyze the self-detection signal information data, obtain the isolation status level of the signal isolation module of each signal channel, and analyze the isolation status level of the signal isolation module of each signal channel to determine whether there is any abnormality in the signal isolation module of each signal channel.

[0007] As a further aspect of the present invention: the self-detection module includes: A preset detection signal group storage unit is used to store several preset detection signal groups; the preset detection signal group includes several preset detection signal information data; the preset detection signal information data includes preset detection signals and designated signal channels; The feature detection signal setting unit is used to randomly select a preset number of preset detection signal groups and set them as feature detection signal groups; The detection signal transmitting unit is used to transmit signals to each signal channel according to the preset detection signal information data of the feature detection signal group.

[0008] As a further aspect of the present invention: the preset detection rule is: S1: Obtain the feature detection signal group through the feature detection signal setting module; S2: The detection signal transmission module transmits the corresponding preset detection signal according to each designated signal channel of the i-th preset detection signal group in the feature detection signal group; S3: Obtain the self-detection signal information data of the i-th preset detection signal group of each signal channel through the signal acquisition module; S4: Set i = i + 1, repeat steps S2-S4 until i > I, then stop repeating; where I is a preset number.

[0009] As a further aspect of the present invention: the number of preset detection signal information data and signal channels in a preset detection signal group is the same; each designated signal channel of the preset detection signal information data in a preset detection signal group corresponds one-to-one with the signal channel.

[0010] As a further aspect of the present invention: the preset detection signal information data includes preset comparison information data of each preset detection signal passing through a specified signal channel.

[0011] As a further aspect of the present invention: the self-detection module further includes an environmental acquisition unit for acquiring environmental parameters during the self-detection process; the environmental parameters include ambient temperature and ambient humidity.

[0012] As a further aspect of the present invention: the working process of the signal analysis and control module is as follows: S10: Analyze the ambient temperature and humidity during the self-detection process to obtain the environmental impact index of each preset detection signal group; and obtain the adjustment coefficient of the preset comparison information data based on the environmental impact index of each preset detection signal group. S20: By comparing and analyzing the preset comparison information data, the adjustment coefficient of the preset comparison information data, and the self-detection signal information data of the i-th preset detection signal group of each signal channel, the signal deviation index of the i-th preset detection signal group of each signal channel is obtained; S30: Analyze the signal deviation index of all preset detection signal groups in each signal channel to obtain the isolation status index of each signal channel; S40: Analyze the isolation status index of each signal channel to obtain the isolation status level of each signal channel.

[0013] As a further aspect of the present invention: the process for determining the isolation status level of the m-th signal channel includes: The process of determining the isolation level of the m-th signal channel includes: The isolation state index A of the m-th signal channel. mi Compare with preset thresholds [R1, R2]: When A mi When <1, the isolation status level of the m-th signal channel is excellent; When 1<A mi When R1 is less than or equal to 1, the isolation level of the m-th signal channel is general. When R1<A mi When R2 ≤ R2, the isolation level of the m-th signal channel is poor; When R2 < A mi At that time, the isolation level of the m-th signal channel is extremely poor.

[0014] As a further aspect of the present invention, the system further includes an early warning module, which is used to issue an early warning when there is an abnormality in the signal isolation module of each signal channel.

[0015] A multi-channel signal isolation and anti-interference device for mixed-signal testing, wherein the device operates using the aforementioned multi-channel signal isolation and anti-interference system.

[0016] The beneficial effects of this invention are: (1) The present invention effectively isolates the signals of each channel by having a signal isolation module corresponding to the signal channel one by one, reducing interference between signals and ensuring test accuracy; the signal acquisition module corresponds to the channel and can comprehensively collect signal information data such as actual signal-to-noise ratio, actual distortion, and actual jitter, providing rich basis for testing; the self-testing module tests the signal isolation module according to preset rules before testing and obtains self-testing signal information data through the acquisition module, which can ensure that each isolation module works normally before formal testing and avoid test data distortion or interference due to module failure; the signal analysis and control module analyzes the self-testing data, obtains the isolation status level and judges whether the module is abnormal, which can promptly detect and deal with problems, improve test efficiency and reliability, and ensure the smooth progress of mixed analog and digital testing; (2) The present invention stores a sufficient number of preset detection signal groups through a preset detection signal group storage unit. The preset detection signal information data in the group corresponds to the signal channel and the specified signal channels are different from each other. This provides rich and accurate detection samples for comprehensive detection of the signal isolation modules of each signal channel, ensuring that there are no blind spots in the detection. The feature detection signal setting unit randomly selects and arranges a preset number of signal groups to form feature detection signal groups. The randomness enhances the flexibility and comprehensiveness of the detection and can discover potential problems under different combinations. The detection signal transmission unit transmits signals at preset intervals according to the arranged data. The interval transmission can avoid mutual interference between signals and ensure that each signal accurately acts on the corresponding channel. With the above settings, the self-detection module can accurately detect the status of the signal isolation modules of each signal channel before the mixed analog-digital test, detect faults in advance, avoid test data distortion due to isolation module problems, and improve the accuracy and reliability of the test. (3) The present invention obtains a set of feature detection signals through a feature detection signal setting module, providing targeted and diverse signal samples for detection. These samples can fully simulate the signal characteristics under different conditions, ensuring the comprehensiveness of the detection. Starting from the first preset detection signal set, the corresponding preset detection signal is transmitted according to the specified signal channel, and the self-detection signal information data of each signal channel is collected in sequence. This orderly and sequential detection method can accurately locate the performance of each signal channel under a specific signal, without missing any details. Finally, by cyclic operation until the detection of all preset number of signal sets is completed, the signal isolation module of the entire system can be tested in an all-round and multi-round manner, effectively improving the accuracy and reliability of the detection. This rule can detect potential problems of the signal isolation module in time before the mixed analog-digital test, avoid test data distortion due to module failure, and ensure the smooth progress of the test. Attached Figure Description

[0017] The invention will now be further described with reference to the accompanying drawings.

[0018] Figure 1This is a system module framework diagram of one embodiment of the present invention. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figure 1 As shown, in one embodiment, a multi-channel signal isolation and anti-interference system for mixed-signal testing is provided. The system includes multiple signal channels, multiple signal isolation modules, multiple signal acquisition modules, a self-testing module, and a signal analysis and control module. The signal isolation module corresponds one-to-one with the signal channel and is used to isolate the signal in the corresponding signal channel from the signals in other signal channels; The signal acquisition module corresponds one-to-one with the signal channel and is used to acquire signal information data in the corresponding signal channel. Specifically, the signal acquisition module may include a spectrum analyzer, an actual distortion meter, and an eye diagram analyzer; the spectrum analyzer is used to acquire the actual signal-to-noise ratio of the signal; the actual distortion meter is used to acquire the actual distortion of the signal; the eye diagram analyzer is used to acquire the actual jitter of the signal; the signal information data may include the actual signal-to-noise ratio, actual distortion, and actual jitter; The self-testing module is used to test the signal isolation modules of each signal channel according to preset testing rules before performing mixed-signal testing on the external chip, and to acquire the self-testing signal information data of each signal channel through the signal acquisition module. Specifically, by using the self-testing module to perform tests on the external chip before the mixed-signal test, it can ensure that the signal isolation modules of each signal channel are in normal working condition before the formal test begins, effectively avoiding test data distortion or interference caused by isolation module failure. The signal analysis and control module is used to analyze the self-detection signal information data, obtain the isolation status level of the signal isolation module of each signal channel, and analyze the isolation status level of the signal isolation module of each signal channel to determine whether there is any abnormality in the signal isolation module of each signal channel. Specifically, the channel quality level can reflect the isolation quality of the signal isolation modules in each signal channel; Through the above technical solution, this embodiment effectively isolates the signals of each channel by having a signal isolation module corresponding to each channel, reducing interference between signals and ensuring test accuracy. The signal acquisition module corresponds to each channel and can comprehensively collect signal information data such as actual signal-to-noise ratio, actual distortion, and actual jitter, providing rich data for testing. The self-test module tests the signal isolation module according to preset rules before testing and obtains self-test signal information data through the acquisition module, ensuring that each isolation module works normally before formal testing and avoiding test data distortion or interference due to module failure. The signal analysis and control module analyzes the self-test data, determines the isolation status level, and judges whether the module is abnormal, which can promptly detect and handle problems, improve test efficiency and reliability, and ensure the smooth progress of mixed analog and digital testing.

[0021] In one embodiment of the present invention, the self-detection module includes: A preset detection signal group storage unit is used to store a number (enough) preset detection signal groups; the preset detection signal group includes a number of preset detection signal information data; the preset detection signal information data includes preset detection signals and designated signal channels; Specifically, the number of preset detection signal information data in a preset detection signal group is the same as the number of signal channels; each designated signal channel in the preset detection signal information data in a preset detection signal group is different from the others, and corresponds one-to-one with the signal channels. The feature detection signal setting unit is used to randomly select a preset number of preset detection signal groups and set them as feature detection signal groups; Specifically, a preset number of randomly selected signals are arranged in the order of selection to form a feature detection signal group; The detection signal transmitting unit is used to transmit signals to each signal channel according to the preset detection signal information data of the feature detection signal group; Specifically, signals are transmitted sequentially at preset intervals according to the arrangement data of the feature detection signal group; Through the above technical solution, the preset detection signal group storage unit in this embodiment stores a sufficient number of preset detection signal groups, and the preset detection signal information data within each group corresponds to the signal channel and the specified signal channels are different from each other. This provides rich and accurate detection samples for comprehensive detection of the signal isolation modules of each signal channel, ensuring no blind spots in the detection. The feature detection signal setting unit randomly selects and arranges a preset number of signal groups to form feature detection signal groups. The randomness enhances the flexibility and comprehensiveness of the detection and can discover potential problems under different combinations. The detection signal transmission unit transmits signals sequentially at preset intervals according to the arranged data. Intermittent transmission can avoid mutual interference between signals and ensure that each signal accurately acts on the corresponding channel. With the above settings, the self-detection module can accurately detect the status of the signal isolation modules of each signal channel before the mixed analog-digital test, detect faults in advance, avoid test data distortion due to isolation module problems, and improve the accuracy and reliability of the test.

[0022] As one embodiment of the present invention, the preset detection rule is as follows: S1: Obtain the feature detection signal group through the feature detection signal setting module; S2: The detection signal transmission module transmits the corresponding preset detection signal according to each designated signal channel of the i-th preset detection signal group in the feature detection signal group; Specifically, the initial value of i is 1; S3: Obtain the self-detection signal information data of the i-th preset detection signal group of each signal channel through the signal acquisition module; S4: Set i = i + 1, repeat steps S2-S4 until i > I, then stop repeating; where I is a preset number; Through the above technical solution, this embodiment first obtains a set of feature detection signals through a feature detection signal setting module, providing highly targeted and diverse signal samples for detection. These samples can fully simulate signal characteristics under different conditions, ensuring the comprehensiveness of the detection. Starting from the first preset detection signal set, the corresponding preset detection signals are transmitted according to the specified signal channels, and the self-detection signal information data of each signal channel are collected sequentially. This orderly and sequential detection method can accurately locate the performance of each signal channel under a specific signal, without missing any details. Finally, through cyclic operation until the detection of all preset number of signal sets is completed, the signal isolation module of the entire system can be tested in a comprehensive and multi-round manner, effectively improving the accuracy and reliability of the detection. This rule can detect potential problems of the signal isolation module in time before mixed analog and digital testing, avoid test data distortion due to module failure, and ensure the smooth progress of the test. It should be noted that the preset quantity I is a preset value, set based on empirical fitting, and will not be described in detail here.

[0023] As one embodiment of the present invention, the preset detection signal information data includes preset comparison information data of each preset detection signal passing through a specified signal channel; Specifically, the preset comparison information data may include preset signal-to-noise ratio, preset distortion, and preset jitter; It should be noted that the preset comparison information data of the preset detection signal is obtained when the signal isolation module of the mixed-signal test is brand new and in good condition, and the corresponding preset detection signal is transmitted to each designated signal channel according to the preset detection signal group. The specific operation process will not be described in detail here.

[0024] As one embodiment of the present invention, the self-detection module further includes an environmental acquisition unit for acquiring environmental parameters during the self-detection process; Specifically, environmental parameters may include ambient temperature and ambient humidity; It should be noted that the methods used to obtain ambient temperature and humidity are existing technologies and will not be described in detail here.

[0025] As one embodiment of the present invention, the operation process of the signal analysis and control module is as follows: S10: Analyze the ambient temperature and humidity during the self-detection process to obtain the environmental impact index of each preset detection signal group; and obtain the adjustment coefficient of the preset comparison information data based on the environmental impact index of each preset detection signal group. Specifically, the method for calculating the environmental impact index of the i-th preset detection signal group is as follows: ; Among them, H i Let be the environmental impact index of the i-th preset detection signal group; f(X) is the judgment function, when X>0, f(X)=X; when X≤0, f(X)=0; t i0 t is the signal transmission start time of the i-th preset detection signal group; is T(t) represents the signal transmission end time of the i-th preset detection signal group; T(t) represents the ambient temperature change curve over time; T0 represents the preset temperature; W T This represents the allowable temperature error value; μ T C is the temperature weighting coefficient. T The temperature is a preset constant; S(t) is the humidity change curve of ambient temperature over time; S0 is the preset humidity; W S This represents the allowable humidity error value; μ S C is the humidity weighting factor. S The humidity is a preset constant; C W Preset constants for the environment; When H iWhen <1, it indicates that the environment of the i-th preset detection signal group has an adverse effect on the isolation effect of the signal channel; When H i When =1, it means that the environment of the i-th preset detection signal group has no adverse effect on the isolation effect of the signal channel; The adjustment coefficients of the preset comparison information data include preset signal-to-noise ratio environmental influence adjustment coefficients, preset distortion environmental influence adjustment coefficients, and preset jitter environmental influence adjustment coefficients. As one embodiment of the present invention, the adjustment coefficient of the preset comparison information data is obtained according to the following table:

[0026] This table was obtained based on empirical fitting and will not be described in detail here.

[0027] Temperature and humidity are common and influential environmental parameters during the operation and testing of electronic devices. Temperature changes affect the physical characteristics of electronic components, such as resistance and capacitance, which in turn affect signal transmission and processing. Excessive humidity can cause condensation on component surfaces, leading to short circuits and other faults, while low humidity can cause static electricity and other problems. This embodiment incorporates both temperature and humidity factors to more comprehensively assess the impact of the environment on the signal isolation module. The environmental impact index of each preset detection signal group calculated using this method intuitively reflects the degree of influence of the environment on the signal channel isolation effect. Furthermore, this calculation method incorporates the temperature change curve T(t) and humidity change curve S(t) over time, meaning it can dynamically capture changes in environmental parameters during the self-detection process. In actual testing scenarios, environmental conditions are often not constant and may fluctuate over time. For example, during long-term operation of the testing equipment, the internal components may heat up, causing the ambient temperature to gradually rise; or the humidity in the testing environment may change due to external weather changes, personnel activities, and other factors. By dynamically reflecting environmental changes in this way, we can more realistically simulate the actual test environment, more accurately assess the real-time impact of environmental factors on signal isolation performance, and provide strong support for timely detection of potential problems. It should be noted that the preset temperature T0 and the allowable temperature error value W... T Temperature weighting coefficient μ T Temperature preset constant C T Preset humidity S0, humidity tolerance error value W S Humidity weighting coefficient μ S Humidity preset constant C S and environmental preset constant C W为 The preset values ​​are set based on empirical fitting and will not be described in detail here.

[0028] S20: By comparing and analyzing the preset comparison information data, the adjustment coefficient of the preset comparison information data, and the self-detection signal information data of the i-th preset detection signal group of each signal channel, the signal deviation index of the i-th preset detection signal group of each signal channel is obtained; Specifically, the method for calculating the signal deviation index of the i-th preset detection signal group in the m-th signal channel is as follows: ; Where M is the number of signal channels, m∈M; G mi Q is the signal deviation index of the i-th preset detection signal group in the m-th signal channel; X0 σ is the preset signal-to-noise ratio of the i-th preset detection signal group in the m-th signal channel; Xi Q is the preset signal-to-noise ratio environmental influence adjustment coefficient for the i-th preset detection signal group; XS Q represents the actual signal-to-noise ratio of the i-th preset detection signal group in the m-th signal channel; SS Q represents the actual distortion of the i-th preset detection signal group in the m-th signal channel; S0 σ represents the preset distortion of the i-th preset detection signal group in the m-th signal channel; Si Q is the preset distortion environmental influence adjustment coefficient for the i-th preset detection signal group; DS Q represents the actual jitter of the i-th preset detection signal group in the m-th signal channel; D0 σ is the preset jitter for the i-th preset detection signal group of the m-th signal channel; Di γ1 is the preset jitter environment influence adjustment coefficient for the i-th preset detection signal group; γ2 is the first weighting coefficient; γ3 is the third weighting coefficient; C1 is the first preset constant; C2 is the second preset constant; C3 is the third preset constant; The signal deviation index of the i-th preset detection signal group of the m-th signal channel can comprehensively and accurately quantify the signal deviation caused by the state of the isolation module of the m-th signal channel, eliminate environmental interference, clearly reflect the actual working condition of the isolation module, provide a reliable basis for judging whether it is normal, help to discover potential problems in time, and ensure the accuracy and reliability of the test. It should be noted that the first weighting coefficient γ1, the second weighting coefficient γ2, the third weighting coefficient γ3, the first preset constant C1, the second preset constant C2, and the third preset constant C3 are preset values, set based on empirical fitting, and will not be described in detail here.

[0029] S30: Analyze the signal deviation index of all preset detection signal groups in each signal channel to obtain the isolation status index of each signal channel; Specifically, the method for calculating the signal deviation index of the i-th preset detection signal group in each signal channel is as follows: ; Among them, A mi ω1 is the comprehensive deviation index of the m-th signal channel; ω2 is the first weighting coefficient; ω3 is the second weighting coefficient. This calculation method integrates three key signal parameters: the difference between the actual signal-to-noise ratio (SNR) and the preset SNR, the difference between the actual distortion and the preset distortion, and the difference between the actual jitter and the preset jitter. In actual mixed-signal testing scenarios, SNR reflects the ratio of useful signal to noise in the signal, distortion reflects the degree of signal distortion during transmission or processing, and jitter characterizes the temporal uncertainty of the signal. By incorporating these three parameters into the calculation system, the changes in the signal after passing through the signal isolation module can be comprehensively evaluated from multiple dimensions, avoiding the one-sided evaluation that may be caused by focusing on only a single parameter, thus more accurately reflecting the impact of the signal isolation module on signal quality. It should be noted that the first weight coefficient ω1 and the second weight coefficient ω2 are preset values, set based on empirical fitting, and will not be described in detail here.

[0030] S40: Analyze the isolation status index of each signal channel to obtain the isolation status level of each signal channel; Specifically, the process of determining the isolation level of the m-th signal channel includes: The isolation state index A of the m-th signal channel. mi Compare with preset thresholds [R1, R2]: When A mi When <1, the isolation status level of the m-th signal channel is excellent, and the isolation status level of the m-th signal channel is normal. When 1<A mi When R1 is less than or equal to 1, the isolation status level of the m-th signal channel is normal, and the isolation status level of the m-th signal channel is normal. When R1<A mi When R2 is less than or equal to 2, the isolation level of the m-th signal channel is poor; the isolation level of the m-th signal channel is slightly abnormal. When R2 < A mi At that time, the isolation status level of the m-th signal channel is extremely poor; the isolation status level of the m-th signal channel is severely abnormal. It should be noted that the preset thresholds [R1, R2] are preset values, set based on empirical fitting, and will not be described in detail here.

[0031] As one embodiment of the present invention, the system further includes an early warning module, which is used to issue an early warning when there is an abnormality in the signal isolation module of each signal channel; No warning will be issued when the isolation status of each signal channel is normal; When a minor anomaly is detected in the signal channel, a minor anomaly warning will be issued. A serious anomaly warning will be issued when a serious anomaly is detected in the signal channel.

[0032] A multi-channel signal isolation and anti-interference device for mixed-signal testing, wherein the device operates using the aforementioned multi-channel signal isolation and anti-interference system.

[0033] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A multi-channel signal isolation and anti-interference system for mixed-signal testing, characterized in that, The system includes multiple signal channels, multiple signal isolation modules, multiple signal acquisition modules, a self-testing module, and a signal analysis and control module; The signal isolation module corresponds one-to-one with the signal channel and is used to isolate the signal in the corresponding signal channel from the signals in other signal channels; The signal acquisition module corresponds one-to-one with the signal channel and is used to acquire signal information data in the corresponding signal channel. The self-testing module is used to test the signal isolation modules of each signal channel according to preset testing rules before performing mixed-signal testing on the external chip, and to acquire the self-testing signal information data of each signal channel through the signal acquisition module. The signal analysis and control module is used to analyze the self-detection signal information data, obtain the isolation status level of the signal isolation module of each signal channel, and analyze the isolation status level of the signal isolation module of each signal channel to determine whether there is any abnormality in the signal isolation module of each signal channel.

2. The multi-channel signal isolation and anti-interference system for mixed-signal testing according to claim 1, characterized in that, The self-testing module includes: A preset detection signal group storage unit is used to store several preset detection signal groups; the preset detection signal group includes several preset detection signal information data; the preset detection signal information data includes preset detection signals and designated signal channels; The feature detection signal setting unit is used to randomly select a preset number of preset detection signal groups and set them as feature detection signal groups; The detection signal transmitting unit is used to transmit signals to each signal channel according to the preset detection signal information data of the feature detection signal group.

3. A multi-channel signal isolation and anti-interference system for mixed-signal testing according to claim 2, characterized in that, The preset detection rule is as follows: S1: Obtain the feature detection signal group through the feature detection signal setting module; S2: The detection signal transmission module transmits the corresponding preset detection signal according to each designated signal channel of the i-th preset detection signal group in the feature detection signal group; S3: Obtain the self-detection signal information data of the i-th preset detection signal group of each signal channel through the signal acquisition module; S4: Set i = i + 1, repeat steps S2-S4 until i > I, then stop repeating; where I is a preset number.

4. A multi-channel signal isolation and anti-interference system for mixed-signal testing according to claim 3, characterized in that, The number of preset detection signal information data and signal channels in a preset detection signal group is the same; each designated signal channel of the preset detection signal information data in a preset detection signal group corresponds one-to-one with the signal channel.

5. A multi-channel signal isolation and anti-interference system for mixed-signal testing according to claim 4, characterized in that, The preset detection signal information data includes preset comparison information data of each preset detection signal passing through a specified signal channel.

6. A multi-channel signal isolation and anti-interference system for mixed-signal testing according to claim 5, characterized in that, The self-testing module also includes an environmental acquisition unit for collecting environmental parameters during the self-testing process; the environmental parameters include ambient temperature and ambient humidity.

7. A multi-channel signal isolation and anti-interference system for mixed-signal testing according to claim 6, characterized in that, The signal analysis and control module operates as follows: S10: Analyze the ambient temperature and humidity during the self-detection process to obtain the environmental impact index of each preset detection signal group; and obtain the adjustment coefficient of the preset comparison information data based on the environmental impact index of each preset detection signal group. S20: By comparing and analyzing the preset comparison information data, the adjustment coefficient of the preset comparison information data, and the self-detection signal information data of the i-th preset detection signal group of each signal channel, the signal deviation index of the i-th preset detection signal group of each signal channel is obtained; S30: Analyze the signal deviation index of all preset detection signal groups in each signal channel to obtain the isolation status index of each signal channel; S40: Analyze the isolation status index of each signal channel to obtain the isolation status level of each signal channel.

8. A multi-channel signal isolation and anti-interference system for mixed-signal testing according to claim 7, characterized in that, The process of determining the isolation level of the m-th signal channel includes: The isolation state index A of the m-th signal channel. mi Compare with preset thresholds [R1, R2]: When A mi When <1, the isolation status level of the m-th signal channel is excellent; When 1<A mi When R1 is less than or equal to 1, the isolation level of the m-th signal channel is general. When R1<A mi When R2 ≤ R2, the isolation level of the m-th signal channel is poor; When R2 < A mi At that time, the isolation level of the m-th signal channel is extremely poor.

9. A multi-channel signal isolation and anti-interference system for mixed-signal testing according to claim 8, characterized in that, The system also includes an early warning module, which is used to issue an early warning when there is an abnormality in the signal isolation module of each signal channel.

10. A multi-channel signal isolation and anti-interference device for mixed-signal testing, characterized in that, The device operates using a multi-channel signal isolation and anti-interference system for mixed-signal testing as described in any one of claims 1-9.

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