Design and Implementation of AM Signal Modulation and Demodulation System Based on STM32 and ZYNQ

This article focuses on taking the STM32F407ZGT6 single-chip microcomputer and the four-channel DDS AD9959 as the core. Combined with the serial port screen, the modulation degree and carrier frequency can be set. For the modulated signal, it is sampled by the AD9481 module and transmitted to the PL side of ZYNQ for demodulation and then the modulated signal is output. The data is transmitted to the PS side and the modulation degree is calculated, and finally transmitted to the upper computer. After testing, the system can realize signal modulation and demodulation when the carrier frequency is 30 - 40MHZ and the modulation signal frequency is 10KHZ. The demodulated waveform has no distortion and the modulation degree error is no more than 3%.