Design of a High-Precision Multi-Channel Digital Signal Generator

A high-precision multi-channel digital signal generator is designed using STM32F microcontroller, AD9833 chip, and the direct digital synthesis technology. It features three output channels, each of which can output sine, triangle, and square waves. The output frequencies and amplitudes of sine and triangle waves are adjustable, whereas only the output frequencies of square waves are adjustable. Frequencies and amplitudes can be adjusted by pressing buttons or using a mobile application via Bluetooth. Results show that this design meets the application requirements for multi-channel signal sources, featuring diverse output signals, independent and continuously adjustable frequency and amplitude, and flexible use.