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Patent Searching and Data


Title:
CONTROL SIGNAL PULSE WIDTH EXTRACTION-BASED PHASE-LOCKED ACCELERATION CIRCUIT AND PHASE-LOCKED LOOP SYSTEM
Document Type and Number:
WIPO Patent Application WO/2021/068326
Kind Code:
A1
Abstract:
Disclosed are a control signal pulse width extraction-based phase-locked acceleration circuit and a phase-locked loop system, wherein the phase-lock acceleration circuit comprises a pulse width extraction control circuit and a current injection switch module; the control output end of the pulse width extraction control circuit is connected to the current injection control end of the current injection switch module, and the current stepping control end of the current injection switch module and the drive input end of the pulse width extraction control circuit are both connected to the preset control signal output end of a phase frequency detector for use in controlling, according to pulse width changes of signals outputted by the preset control signal output end, the current injection switch module to inject charges until the phases of a reference clock signal and feedback clock signal inputted by the phase frequency detector are synchronized. Under the on-off control of the phase-locked acceleration circuit, a low pass filter receives charges injected by the current injection switch module, which implements the rapid injection of charges to the low pass filter until close to stability, and at the same time, the stepping injection of charges can prevent oscillation and shorten the phase-locked time.

Inventors:
HAN HUAIYU (CN)
SHAO YAOHUA (CN)
ZHAO WEIBING (CN)
Application Number:
PCT/CN2019/117034
Publication Date:
April 15, 2021
Filing Date:
November 11, 2019
Export Citation:
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Assignee:
AMICRO SEMICONDUCTOR CO LTD (CN)
International Classes:
H03L7/18
Foreign References:
CN109921790A2019-06-21
CN108718195A2018-10-30
CN102882520A2013-01-16
GB2285547A1995-07-12
EP1241791A3
US20050111605A12005-05-26
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