一种快速锁定锁相环的方案设计  

A design of a fast lock-in phase lock loop

作　　者：潘鸿泽 王东兴[1] 宋明歆 Pan Hongze;Wang Dongxing;Song Mingxin(Harbin University of Science and Technology,Harbin 150080,China;Hainan University,Haikou 570228,China)

机构地区：[1]哈尔滨理工大学理学学院,黑龙江哈尔滨150080 [2]海南大学,海南海口570228

出　　处：《电子技术应用》2019年第11期47-50,共4页Application of Electronic Technique

摘　　要：提出了一种锁相环快速锁定的方案,在传统锁相环基础上,额外设置辅助充电模块,此模块可实现在输入参考时钟与反馈时钟频率差距较大时,提供大电流对滤波器中的电容充电,在临近锁定状态时退出快速锁定模式切断充电通路,因此极大地缩短了的锁定时间,并基于电路仿真验证了方案的可行性与稳定性。In this paper,a fast lock-in scheme of PLL is proposed.On the basis of traditional PLL,an auxiliary charging module is added.This module can charge the capacitor of the filter with a large current when there is an obvious difference between the frequency of input reference clock and feedback clock,and quit the fast lock-in mode and cut-off the charging path when the frequency gap becomes small,which greatly shortens the lock-in time.The feasibility and stability of the approach are verified by circuit simulation.

关 键 词：锁相环 鉴频鉴相器 电荷泵 滤波器 压控振荡器 分频器 快速锁定 

分 类 号：TN432[电子电信—微电子学与固体电子学]