基于FPGA的DDS应用 毕业论文.doc

基于FPGA的DDS应用 摘 要 随着我国经济和科技的发展，对相应的测试仪器和测试手段也提出了更高的要求，信号发生器己成为测试仪器中至关重要的一类，因此开发信号发生器具有重大意义。但传统的信号发生器大多采用专用芯片或单片机或模拟电路，成本高或控制方式不灵活或波形种类较少等不能满足要求。本课题的目的是研究函数信号发生器的设计方法，克服传统方法的缺点，以更好的方法设计出比较复杂的调频、调幅功能的信号发生器。本文采用直接数字合成（DDS）技术，以现场可编程门阵列（FPGA）作为硬件基础，设计函数信号发生器，直接数字频率合成（DDS）就是先将所需要产生的信号波形的一个周期的若干个样点的的二进制信息存储在波形存储器中，再通过硬件电路依次从波形存储器中读取出来。经数/模转换以及滤波后得到所需信号的波形，他的查表合成波形的方法可以满足产生任意波形的要求。关键词 直接数字合成；现场可编程门阵列；数/模转换器；Abstract: ???Along with our country economy and the technical development, the paraphrase should the measuring instrument and the test method also proposed a higher request, signal generating device oneself becomes in the measuring instrument a very important kind, therefore the development signal generating device has the great significance.But the traditional signal generating device mostly uses the special-purpose chip either the monolithic integrated circuit or the analogous circuit, the cost high either the control mode not nimble or the profile type few and so on cannot satisfy the request. This topic goal is studies the function signal generating device the design method, the victory tradition method shortcoming, by better methods design quite complex frequency modulation, amplitude modulation function signal generating device.This article uses the Direct Digital synthesis the (DDS) technology, by scene programmable gate array (FPGA) took the hardware foundation, the design function signal generating device, the direct digital frequency synthesizes a waveform cycle certain type spot which (DDS) will be needs to produce first the binary message will save in the profile memory, then in turn will read through the hardware electric circuit from the profile memory.Obtains after the number/mold transformation as well as the filter needs the signal the profile, his table look-up synthetic waveform method may have the random profile request satisfiedly.?? 目录 绪论 5 第一章 DDS的设计基础与实现工具 5 第二章 基于FPGA的DDS设计 9 2.2 LM358的功能及介绍 10 2.3 D/A转换及运放的实验原理图 10 2.6 EP1C3T100C8芯片 11