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1. (WO2017148240) LOSS-OF-LOCK DETECTION SYSTEM AND METHOD FOR PHASE-LOCKED LOOP

Pub. No.:    WO/2017/148240    International Application No.:    PCT/CN2017/072902
Publication Date: Sat Sep 09 01:59:59 CEST 2017 International Filing Date: Sun Feb 05 00:59:59 CET 2017
IPC: H03L 7/183
Applicants: ZTE CORPORATION
中兴通讯股份有限公司
Inventors: GU, Chunjie
顾春杰
CHEN, Yongming
陈永铭
WANG, Renqiao
王仁巧
YANG, Shuo
杨硕
Title: LOSS-OF-LOCK DETECTION SYSTEM AND METHOD FOR PHASE-LOCKED LOOP
Abstract:
A loss-of-lock detection system for a phase-locked loop. An input clock frequency of the phase-locked loop is smaller than an output clock frequency of the phase-locked loop. The system comprises a frequency divider, a trigger, and a counter. The frequency divider uses an output clock of the phase-locked loop as a clock signal, and an output end of the frequency divider is connected to a data end of the trigger. The trigger uses an input clock of the phase-locked loop as a sampling clock, and an output end of the trigger is separately connected to a reset end of the frequency divider and a reset end of the counter. The counter uses the input clock of the phase-locked loop as a counting clock, and an output end of the counter outputs an indication signal indicating lock or loss of lock.