锁相环中无源滤波器的设计

环路滤波器是锁相环中的一个关键模块,一般采用有源和无源两种。本文对无源滤波器的结构以及滤波器对锁相环性能的影响进行了分析,总结了无源二阶的设计方法,然后针对三阶无源滤波器进行了设计,通过仿真可以看出结果满足了设计指标。

The Design of Passive Filter in PLL

Loop filter is one of the most important parts in PLL system.There are two kinds of filter which are active filter and passive filter.We analyzed the structure of passive filter and the influence to the PLL performance in this paper.We summarized the design method of second order passive filter,and designed the third passive filter.Throughout the simulation results,we find the design is satisfied to specification.