基于DDS相位差可调双通道信号发生器的设计

The Design of A Double Channel Waveform Generator with Adjustable Phase Based on DDS

首先介绍了DDS(直接数字频率合成技术)的基本原理,之后给出基于FPGA器件实现相位可调双路同频正弦信号发生器的设计系统。采用VHDL实现了各个模块的功能,并同时在QuartusⅡ中完成了设计与仿真,给出了软件仿真和试验的结果。实验结果表明,该系统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、输出频率和相位可调等优点。

This paper introduces principle of the direct digital frequency synthesis （DDS） technology, then the design system of sine signal generator with the double same-frequency channel is presented based on FPGA. It is designed and implemented by using VHDL hardware description language. In addition, the software simulation and experimental results are given using the QuartuslI software . The experimental results show that the output of the double channels sine signal source have characteristics of small waveform distortion, frequency and phase accuracy, and the frequency and phase are adjustable in real time as well.