Research On Reliability And Anti-interference Measures Of Analog Circuits

With the rapid development of electronic circuits,the reliability requirements of analog circuits are getting higher and higher,and the problems of analog circuits susceptible to interference are becoming more and more serious.Therefore,it is necessary to study the reliability and anti-interference measures of analog circuits.This paper mainly studies the anti-interference ability of analog circuits to improve the reliability of analog circuit operation.Through the analysis of the shielding,grounding isolation and filtering measures of the analog circuit,the design of the hardware filter circuit of the analog circuit and the proposal of software filtering denoising algorithm,the analysis of the actual anti-interference measures of the analog circuit,the design of the analog circuit power filter and the improvements to algorithms for analysis and filtering of software to remove interference noise in analog circuit signals are completed..In accordance with the analysis process of analog circuit anti-interference,this paper mainly completed the following works:Firstly,the research on anti-interference measures of analog circuits.In view of the conducted and radiated interference problems of analog circuits,the anti-jamming mechanism of grounding,shielding,isolation and filtering is analyzed.And taking analog circuit as the research object,some practical applications of anti-interference measures are analyzed.Then,the anti-interference design and analysis of the hardware filter of the analog circuit.In order to better prevent the high frequency noise from the power supply from affecting the useful signal of the analog circuit,the simulation design of the power supply filter is completed by selecting the filter component based on Matlab analysis.From the perspective of insertion loss,the equivalent circuit of the filter under common mode interference and differential mode interference is considered separately.The insertion loss of filter ideal and high frequency parameters,different high frequency distribution parameters and different source loads are analyzed and verified in PSPICE.It is verified that the power filter designed in this paper can filter out the high-frequency interference noise in the analog circuit power supply,meet the design parameters and insert the filter into different parameters.At the same time,through the analysis of the insertion loss ofdifferent parameter filters,the effects of different high frequency parameters and different source loads on the insertion loss of the filter model are obtained.From the perspective of the filter signal gain,the signal scanning analysis of different frequencies is performed under different inductance parameters and capacitance parameters of the low-pass filter considering the distributed parameters in the PSPICE simulation software,and the filtering is obtained from the amplitude-frequency response waveform.The influence of different inductances and different capacitance parameters on the filter output response curve provides a theoretical basis for the design of AC power supply low-pass filter.Finally,research on software filtering anti-interference of analog circuits.the anti-interference ability of the analog circuit after the hardware anti-interference measures has been significantly improved,but in order to obtain useful signals with high quality and improve the signal-to-noise ratio of the signal,it is necessary to the noise signal is digitally filtered and denoised to obtain a purer useful signal,which is more conducive to subsequent processing of the analog signal.In the traditional algorithm of wavelet threshold denoising for analog circuit signal,there are constant deviation,threshold function discontinuity and some existing improved methods,resulting in poor denoising effect and insignificant signal characteristics,an mproved wavelet threshold is proposed.The effectiveness and superiority of the noise reduction algorithm are proved by the implementation of the algorithm and denoising in the typical noisy signal and analog circuit with interference noise.