摘 要：介绍了直接数字频率合成 (DDS) 技术的基本原理，给出了基于Altera公司FPGA器件的一个三相正弦信号发生器的设计方案，同时给出了其软件程序和仿真结果。仿真结果表明：该方法生成的三相正弦信号具有对称性好、波形失真小、频率精度高等优点，且输出频率可调。

关键词：直接数字频率合成；现场可编程门阵列；FPGA；三相正弦信号-Abstract: Direct Digital Synthesis (DDS) technology, the basic principles are given Altera-based FPGA devices the company a three-phase sinusoidal signal generator design program, at the same time give its software programs and simulation results. The simulation results show that: the method to generate three-phase sinusoidal signal with good symmetry, waveform distortion small, the frequency of high precision, and adjustable output frequency. Key words: direct digital synthesizer　field programmable gate array　FPGA　three-phase sinusoidal signal