简易波形发生器的设计

文档编号:CK125   文档字数:13574,页数:36

摘     要

    各种各样的信号是通信领域的重要组成部分，其中正弦波、余弦波、三角波、方波、锯齿波等是较为常见的信号。在科学研究及教学实验中，我们常常需要这几种信号的发生装置。为了实验、以及研究的方便，研制一种灵活适用、功能齐全、使用方便的信号源是十分必要的。
    本设计实现了一个基于SOPC 的任意波形发生器，不仅可以合成正弦、余弦、方波、三角波和锯齿波等常见波形，还可以通过PC 端软件编辑任意波形数据，并下载到以Nios II嵌入式微处理器为核心的SOPC 系统上用于产生任意波形，具有控制灵活，输出频率稳定、准确，波形质量好和输出频率范围宽等优点。

关键词： 直接数字频率合成；可编程片上系统；NIOSⅡ ；信号源；单片机

Abstract

    Various signals are an important part of correspondent area. In this area, sine wave,cosine waveforms, triangle wave ，sawtooth waveforms and square wave are common signals. In science research and teaching experiment, we often need the occurrence equipment of these signals. In order to make the experiment and research easier, to develop a suitable, full functional and easily used signals source is essential.
    This paper describes an arbitrary waveform generator ( AWG ) based on SOPC, which can not only synthesize sine waveforms, cosine waveforms, square waveforms, triangle waveforms, sawtooth waveforms and other common waveforms, but also generate arbitrary waveforms with data edited and downloaded by PC software. It has advantages of easy control, stable output frequency, high quality waveform and wide bandwidth.
   
Keywords： DDS；SOPC；NIOSⅡ ；signal source； SCM

目  录

摘要.............................................................I
ABSTRACT........................................................II
目录...........................................................III
1   绪 论........................................................1
1.1 课题背景.....................................................1
1.2 国内外波形发生器的发展现状...................................1
 2  直接数字频率合成技术(DDS)介绍.................................4
2.1 频率合成技术.................................................4
    2.2 DDS 的原理和结构.............................................6
    3  系统总体设计.................................................11
3.1 片上系统设计................................................11
    3.2 D/A 转换和滤波电路..........................................18
3.3 PC 端软件...................................................22
 4  实验结果.....................................................26
4.1 波形图展示..................................................26
4.2 实验结果评估................................................28
5  总结.........................................................29
致谢............................................................30
参考文献........................................................31

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