ZHANG Zheng1,2，DONG Shao-wu1，ZHANG Min1, 2

（1. National Time Service Center, Chinese Academy of Sciences, Xi’an, Shaanxi 710600, China；

2. Graduate University of Chinese Academy of Sciences, Beijing 100039, China）

Abstract：The fundamental principle for the direct digital frequency synthesis is introduced in brief, especially, the realization in hardware for the direct digital frequency synthesis based on FPGA（field programmable gate array）is presented. The experiment indicates that the direct digital frequency synthesis based on FPGA can generate any kind of waveform and the frequency, phase and amplitude can be adjusted arbitrarily.

Key words：direct digital frequency synthesis；field programmable gate array；Verilog HDL