Design of An Amplifier Nonlinear Distortion Experimental Equipment

A multi-stage amplifier circuit composed of transistors is designed in the amplifier nonlinear distortion experimental equipment, which can generate five different distortion signals including top distortion through control. The single-chip microcomputer (stm32fl03vet6) is used as the controller to generate five different distortion signals through two-stage common emission amplifier circuit and one-stage Output Capacitor Less(OCL) power amplifier circuit. The signal is collected through the ADC provided by the singlechip microcomputer, The distortion signal is processed and calculated by Fast Fourier Transform (FFT). Finally, the parameters such as voltage peak to peak(Vp-p) and total harmonic distortion(THD) of the distortion signal are displayed by TFT LCD screen to realize accurate measurement of the nonlinear distortion related parameters of the distortion signal.