相位可控双路同频信号源的FPGA部分设计与实现

The design of Double channels of Same-frequency Singnal source with controllable phase on FPGA

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器件的相位可调双路同频正弦信号发生器的设计方案,同时给出了其软件程序和试验结果。试验结果表明:该方法生成的双路同频正弦信号具有波形失真小、频率和相位精度高,且输出频率与相位可调等优点。

In this paper, the principle of the direct digital frequency synthesis （DDS） technology is introduced. Then the design scheme of sine signal generator with the double same-frequency channel is presented based on FPGA. Besides, the software program and experimental results are given at the last part of the paper. The conclusions drawn from the experimental results show that the output of the double channels sine signal source have characteristics of small waveform distortion, frequency and phase accuracy. In addition, the frequency and phase are adjustable in real time.