Title:
LOSS-OF-LOCK DETECTION SYSTEM AND METHOD FOR PHASE-LOCKED LOOP
Document Type and Number:
WIPO Patent Application WO/2017/148240
Kind Code:
A1
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.
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Inventors:
GU CHUNJIE (CN)
CHEN YONGMING (CN)
WANG RENQIAO (CN)
YANG SHUO (CN)
CHEN YONGMING (CN)
WANG RENQIAO (CN)
YANG SHUO (CN)
Application Number:
PCT/CN2017/072902
Publication Date:
September 08, 2017
Filing Date:
February 04, 2017
Export Citation:
Assignee:
ZTE CORP (CN)
International Classes:
H03L7/183
Foreign References:
| CN101399541A | 2009-04-01 | |||
| CN1801623A | 2006-07-12 | |||
| US6762631B1 | 2004-07-13 |
Attorney, Agent or Firm:
BEYOND ATTORNEYS AT LAW (CN)
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