锁相环之环路捕获性能,汪冰伦.doc

《锁相技术》课程论文院(系) 信息科学与工程学院专业通信工程届别 2011 级班级2 学号 1115105048 姓名汪冰伦讲师刘菁华锁相环的环路捕获的分析汪冰伦(华侨大学信息科学与工程学院) 摘要:在锁相环平时的学****过程中,我们经常是假定环路已经锁定的前提下来讨论各种问题的。然而在实际工作中,例如开机、换频或者由开环到闭环,一开始环路总是失锁的,因此环路需要处理而进入锁定状态,我们把这种处理称为捕获。本文将分析环路捕获的过程、捕获带与捕获时间等内容,提供一些理论基础。关键词:锁相环;捕获;捕获过程;捕获时间 The Analysis of Phase Locked Loop ’s loop Capture Wang Binglun (Information Science and Engineering Academic ,HuaQiao University) Abstrac t: In the daily study of Phase Locked Loop,formally ,loops are always considered locked .However in practical work,for example,when boot,changing frequency and change the state of loop,loops are often loss of ,loop should be handled tobe we name this process “ loop capture ”.Some theories will be analysed ,for example the process of loop capture , capture time ect. Key word s: PPL ; Capture ; Capture process ; a uxiliary capture 1 目录 0引言....................................................... 2 1 捕获的基本概念.............................................. 2 捕获.................................................... 2 相位捕获与频率捕获............... ........................ 2 自捕获与辅助获........................................... 2 .................... ................... 3 2 捕获的过程与捕获特性......................................... 3 ................................................ 3 ........................................... 6 3 捕获带与捕获时间....................