基于MATLAB的数字锁相环的仿真设计

本 科 生 毕 业 设 计

（申请学士学位）

论文题目 基于Matlab的

数字锁相环的仿真设计

作者姓名 专业名称 电子信息工程 指导教师

2014年5月

学 生： 学 号： 答 辩 日 期： 指 导 教 师 ：

2014 年 5 月 24 日

（签字） （签字）

目录

摘要 .................................................................................................................................................................... 1 Abstract .............................................................................................................................................................. 1 1 绪论 ................................................................................................................................................................ 2

1.1 本文研究背景 ..................................................................................................................................... 2 1.2 本文研究意义 ..................................................................................................................................... 2 1.3 锁相环和仿真方式 ............................................................................................................................. 2

1.3.1 锁相环 ...................................................................................................................................... 2 1.3.2 仿真方式 .................................................................................................................................. 2 1.4 本文研究内容 ..................................................................................................................................... 3 2 模拟锁相环Matlab仿真 ............................................................................................................................... 3

2.1 模拟锁相环方案 ................................................................................................................................. 3

2.1.1 模拟鉴相器 .............................................................................................................................. 3 2.1.2 模拟低通滤波器 ...................................................................................................................... 6 2.1.3 模拟压控振荡器 ...................................................................................................................... 7 2.2 模拟锁相环仿真 ................................................................................................................................. 9 2.3 本章小结 ........................................................................................................................................... 10 3 数字锁相环Matlab仿真 ............................................................................................................................. 10

3.1 数字锁相环方案 ............................................................................................................................... 10

3.1.1 数字鉴相器 ............................................................................................................................. 11 3.1.2 数字滤波器 ............................................................................................................................ 12 3.1.3 数字压控振荡器 .................................................................................................................... 14 3.2 数字锁相环仿真 ............................................................................................................................... 15 3.3 本章小结 ........................................................................................................................................... 16 4 总结与展望 .................................................................................................................................................. 16 参考文献 .......................................................................................................................................................... 17 致谢 .................................................................................................................................................................. 19

滁州学院本科毕业设计

基于Matlab的数字锁相环的仿真设计

摘要：锁相环是一种能够自动跟踪信号相位并达到锁频目的的闭环负反馈系统。数字锁相环在无线

电领域得到较广泛的应用和发展。而且已经成为雷达、通信、导航等各类电子信号产品不可替代的元器件之一。锁相环的窄带跟踪性能使其得到较广泛应用。因为锁相技术在实际应用中较为复杂，所以锁相环的设计通常采用仿真设计这种方式。本次设计采用Matlab这一软件进行辅助仿真设计，完全能达到设计预期的目标。Matlab中的Simulink仿真软件,具有很强的灵活性和直观性。本次设计所采用的方法是在simulink中搭建模拟锁相的模型，并对模拟锁相环的组成、结构、设计进行不断的分析和改进。然后根据模拟锁相环的原理进行改进，并搭建数字锁相环。

关键词：锁相环；自动跟踪；matlab；simulink

Simulative design of digital phase-locked loop based on Matlab

Abstract:PLL is the automatic tracking system of close loop atracking signal phase. It is widely used in

various fields of radio. It has become an irreplaceable part of radar, communication, navigation and all kinds of electronicsignal device. PLL is able to be widely used. Because, it has unique narrow-band tracking performance. However, because of the complexity of phase lock technique, for the design of PLL have brought great difficulty. This design uses Matlab, the simulative software for design assistance, can completely meet the design expectations. Simulink simulative software on Matlab, has strong flexibility and intuitive. Methods used by this project is to build the analog phase locked in the Simulink model, and the composition, structure, design of analog phase-locked loop of continuous improvement and analysis. It improved according to the principle of analog PLL, build digital phase-locked loop in Simulink, and then reach the simulation design of digitalphase-locked loop based on Matlab the design objective .

Key words: PLL, Automatic tracking, Matlab, simulink

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