Abstract: The high accuracy, high frequency signal generator based on direct digital synthesizer is designed to meet the demand of modern electronic measurement and communication system. The signal generation function is according to the AD9854ASVZ chip characteristic. Using STM32F103VE chip as the main controller, the peripheral low-pass filter circuit, multistage amplifier circuits, communication module, power circuit and so on are designed. The system software was programmed by C language and Python tools. Procedures are developed in C language to control signal and monitor process, using Python tools to implement visual interface. Based on the result of testing, the output frequency is from DC to 150 MHz, the frequency resolution is 1 μHz, the frequency drift is 100 PPB, the peak-to-peak value of output waveform amplitude is from 10 mV to 20 V. The system has advantages of simple structure, high precision and reliability, which can satisfy the demanding for the engineering application.

Key words: direct digital synthesizer (DDS), signal generator, STM32F103VE, AD9854ASVZ, high-speed operational amplifier