基于FPGA的DDS信号发生器的设计与实现

摘要

针对专用DDS芯片功能单一的缺点，提出了基于FPGA的DDS信号发生器的设计方案。利用Xilinx公司的ISE完成了系统核心部分数控振荡器的设计，其中波形存储器通过调用IP核实现，方便且集成度高。通过功能模块仿真与最终完整电路测试，表明基于FPGA的DDS信号发生器稳定度高，分辨率高以及转换速度快，而且能够输出任意波形的信号。由于FP⁃GA实现软核处理器，因此可以方便地对DDS进行修改与优化，具有无与伦比的灵活性。%According to signal function of dedicated DDS(Direct Digital Frequency Synthesizer)chip,a design scheme of DDS signal generator based on FPGA(Field Programmable Gate Array)is introduced. Using Xilinx ISE to design core part of the system,the digitally controlled oscillator,in which the waveform memory is implemented by calling the IP core. And this method is very convenient and IP core is high integration. It shows that DDS signal generator based on FPGA has a stability,high resolution and fast conversion speed,and can generate all kinds of signal according to functional modules simulation and complete circuit test. Since FPGA implements the soft-core processor,DDS can easily be modified and optimized with unparalleled flexibility.