基于DDS的通信信号模拟电路设计

摘要：任意波形发生器是不断发展的数字信号处理技术和大规模集成电路工艺蕴育出来的一种新型测量仪器，能够满足人们对各种复杂信号或特殊信号的需求，代表了信号源的发展方向。本课题以FPGA为硬件基础，通过系统硬件电路设计、逻辑设计和软件设计，实现了一款基于FPGA的低成本、便携式、可扩展的即插即用任意波形发生器。

本文系统的分析了DDS技术的基本组成、工作原理及其输出信号的频谱特性，给出了改善合成信号频谱纯度的方法，为任意波形发生器的设计与实现提供了理论指导。以Quartus II软件作为开发工具，实现波形的调幅、调频及多种数字调制。通过在操作面板上选择正弦波、方波等常规波形，并设置波形参数，进而控制硬件系统产生相应波形信号，充分体现了任意波形发生器的“任意性”。通过测试，证明本任意波形发生器达到了预期的设计要求。

关键词直接频率合成可编程门阵列通用串行总线虚拟仪器

毕业设计说明书外文摘要

Title Design of signal generator Based on DDS

Abstract： The arbitrary waveform generator is digital signal processing technology and the continuous development of large scale integrated circuit technology development of a new measurement instrument can meet the needs of a variety of complex signals or special signal, on behalf of the development direction of the signal source.In this paper, based on FPGA as the hardware foundation, through the system hardware circuit design, logic design and software design, a low-cost, portable, extensible plug and play arbitrary waveform generator based on FPGA is realized.

This paper analyzes the spectrum characteristics of DDS technology, the basic composition, working principle and the output signal of the method of improving the spectrum purity of synthesized signal is given, for the design and implementation of arbitrary waveform generator provides the theoretical guidance. Quartus II software as a development tool to achieve waveform amplitude modulation, frequency modulation and a variety of digital modulation. The sine wave, Fang Bo and other conventional waveforms are selected on the operating panel, and the waveform parameters are set, and then the corresponding waveform signal is controlled by the hardware system". The test results show that the arbitrary waveform generator achieves the desired design requirements.

Keywords DDS FPGA USB Virtual Instrument

1 引言 1

1.1 课题背景 1

1.2 课题研究的目的和意义 1

1.3 国内外概况 2

1.4 课题的主要研究工作 3

2 系统设计方案的研究 5

2.1 频率合成技术及性能指标 5

2.2 DDS的基本原理 8

3 数字调制信号 11

3.1概述 11

3.2调制方式 11

3.3 ASK幅移键控 12

3.4 PSK相移键控 13

3.5 FSK 频移键控 15

4 总体设计 16

4.1 FPGA设计DDS电路的具体实现 16

4.2 用Quartus Ⅱ进行DDS模拟基于DDS的通信信号模拟电路设计:http://www.chuibin.com/tongxin/lunwen_206401.html