Design of Amplifier Nonlinear Distortion Circuit Based on Analog Switch
Non-linear distortion is one of the important factors affecting the performance of analog circuits.Aiming at the impact of top distortion,bottom distortion,two-way distortion and crossover dis-tortion on the transistor amplifier circuit,after introducing the reasons for non-linear distortion and the quantitative evaluation based on f total harmonic distortion,an amplifier nonlinear distortion research de-vice with STM32F103ZET6 micro-controller as the core was designed and manufactured.The device mainly includes hardware circuits and software drivers such as transistor amplifiers,acquisition and mea-surement,and micro-controller.Basic transistor amplification and four types of non-linear distortion gen-erating circuits were realized through two-stage negative feedback common-emitter amplification and class B amplification respectively.BL1551 and CD4053 analog switches were used to control the wave-form output,and the total harmonic distortion value was extracted by FFT algorithm.The system test showed that the system can generate distortionless waveform、four kinds of nonlinear distortion voltage waveform and display the total harmonic distortion coefficient;the total harmonic distortion coefficient of the specified signal from the external signal source was tested,the average accuracy reached 95%.
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维普
