[信息与通信]数字锁相环设计.doc

基于MATLAB的DPLL设计与仿真  PAGE \* MERGEFORMAT 31 摘要 现代通信系统中，同步问题是决定系统性能和应用的根本问题。锁相环路作为同步技术的核心部件,已在模拟和数字通信及无线电电子学等各个领域中得到了极为广泛的应用，特别是在数字通信的调制解调和位同步中常常要用到各种各样的锁相环。 本文分析了全数字锁相环(NR—DPLL) 基本组成和工作原理，利用MATLAB对锁相环的进行设计，了解其各个部分功能具体结构，利用MATLAB工具箱对锁相环的进行仿真，改变锁相环参数最后进行了参数分析。同时重点针对DDS做详细了解，对其做出仿真并进行分析 关键词：奈奎斯特型全数字锁相环；模块设计；仿真；参数分析  Abstract Modern communication systems, the synchronization problem is to determine system performance and application of the fundamental problems. PLL synchronization technology as the core components in analog and digital communication and radio electronics and other fields has been very widely used, especially in the digital communications modem and bit synchronization often use a variety of all kinds of PLL. This paper analyzes the all-digital phase-locked loop (NR-DPLL) basic composition and working principle of the PLL using MATLAB to design, understand the function of each part of the specific structure of the PLL using MATLAB simulation toolbox change the PLL parameters Finally, a parametric analysis. At the same time focusing on a detailed understanding of DDS, making simulation and analysis of its Keywords: Nyquist-type all-digital phase locked loop, module design, Simulation, Parameter  目 录  TOC \o 1-3 \h \z \u  HYPERLINK \l _Toc262652124 摘要  PAGEREF _Toc262652124 \h I  HYPERLINK \l _Toc262652125 Abstract  PAGEREF _Toc262652125 \h II  HYPERLINK \l _Toc262652126 目 录  PAGEREF _Toc262652126 \h III  HYPERLINK \l _Toc262652127 第一章 绪论  PAGEREF _Toc262652127 \h 2  HYPERLINK \l _Toc262652128 1.1 选题的背景与意义  PAGEREF _Toc262652128 \h 2  HYPERLINK \l _Toc262652129 1.2 数字锁相环的分类  PAGEREF _Toc262652129 \h 2  HYPERLINK \l _Toc262652130 1.3 论文的主要研究工作  PAGEREF _Toc262652130 \h 3  HYPERLINK \l _Toc262652131 第二章 锁相环基本原理  PAGEREF _Toc262652131 \h 4  HYPERLINK \l _Toc262652132 2.1 鉴相器(PD)  PAGEREF _Toc262652132 \h 5  HYPERLINK \l _Toc262652133 2.2 环路滤波器(LPF)  PAGEREF _Toc262652133 \h 6  HYPERLINK