基于fpga的dds设计论文.pdf

基于 FPGA 的 DDS 的设计 电子信息科学与技术专业 刘童 指导教师 孙红艳 摘要：在电子技术飞速发展的今天，人们对于信号源的要求也逐渐提高。传统的信号源采用独立元件或 简单数字电路设计，导致了经济代价大，设计周期长，产品的升级换代困难等诸多不足，显然已经不适 合现代电子技术的要求。因此，要利用全新的思路设计符合要求的信号源。采用 DDS 技术已成为当前 设计信号源的主流方法，DDS 是指直接数字式频率合成器，它是利用相位的概念直接合成用户所需波 形，主要包括相位累加器，波形存储器，数模转换器和低通滤波器组成，通过 FPGA 利用硬件描述语 言 VHDL 来进行此设计。与传统的信号源相比，利用 DDS 原理设计的信号源具有频率分辨率高，频率 转换速度快，切换相位连续等优点，使用 FPGA 来进行设计，大大缩短了设计周期，降低了研发和制 作成本，同时设计可以根据用户不同需求进行改进和升级。 关键字：信号源；DDS;FPGA DDS Based on the design of the FPGA Student majoring in Electronic information science and technology Liu tong Tutor Sun hong yan Abstract ：In the electronic technology rapid development today, people for the signal source requirement also gradually improve. The traditional signal source adopt independent components or simple digital circuit design, leading to the economic cost, the design cycle is long, the upgrade of products such as difficulty some shortcomings, have apparently not suitable for the modern electronic technology requirements. Therefore, to take advantage of the new idea design to meet the requirements of source. The technology has become the DDS design method of the mainstream of the signal source, is referred to as a direct DDS digital frequency synthesizer, it is to use the concept of phase the direct synthesis of customer need waveforms, mainly including phase accumulators, waveform memory, digital-to-analog converters and low pass filter composition, through the FPGA use hardware description language to this design VHDL. Compared with the traditional signal source, using the principle of the signal source has design DDS frequency resolution