软件锁相环环路滤波器和闭环幅频响应分析  

Analysis of the Magnitude Frequency Responses of Software Phase-Locked Loop and Its Loop Filter

作　　者：王赟[1] 袁嗣杰[2] 杨君[1] 

机构地区：[1]装备指挥技术学院研究生院,北京101416 [2]装备指挥技术学院光电装备系,北京101416

出　　处：《测控技术》2009年第9期88-90,94,共4页Measurement & Control Technology

摘　　要：为了解决软件锁相环设计时遇到的参数设置问题,通过导数逼近法给出了软件锁相环的Z域数学模型,并研究了参数变化对环路滤波器幅频响应及闭环幅频响应的影响,从而得到阻尼系数、系统增益、采样率与系统性能之间的关系,为实际设计软件锁相环时参数的设置提供了理论依据和参考。In order to solve the problem of parameter setting during the design of a software phase-locked loop （SPLL） is designed, the Z domain mathematical model by the way of differential coefficient approximation is built and the influences of the parameters＇ changes to the magnitude frequency responses of both the whole loop and loop filter which is one portion of PLL are studied. Accordingly, relation among the damping factor, systemic gain, sampling rate and the performance of the system are found, which can be used as the theoretic basic or reference for the designing of SPLL.

关 键 词：导数逼近法 软件锁相环 环路滤波器 幅频响应 

分 类 号：TN911[电子电信—通信与信息系统]