This design is a simple amplifier nonlinear distortion research device, which can output a sine wave signal without obvious distortion and four different distorted waveforms according to requirements. In this design, the controlled transistor amplifier circuit is the core circuit. Five independent signal generation circuits are used in the circuit to generate the five waveforms required by the question, and the analog switch chip CD4066 is used to switch the final output waveform. The sampling and analysis part uses an operational amplifier to build a signal processing circuit to convert the output waveform into two signals with completely opposite phases. The AD sampling port of the 32 single-chip microcomputer is used for sampling, and the ST official FFT library is called to perform fast Fourier transform on the collected signal to obtain the amplitude of each harmonic, and thereby obtain the frequency of the output signal, total harmonic distortion and other information.
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