Title: Lock detecting circuit and method for phase lock loop system
Application Number: 200610150025 Application Date: 2006.10.24
Publication Number: 1945977 Publication Date: 2007.04.11
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H03L7/08;H03L7/00;H03L7/18;G01R31/28
Applicant(s) Name: Weisheng Electronic Co., Ltd. Address:
Inventor(s) Name: Huang Junzhe
Attorney & Agent: liuxin yu
Abstract:
    This invention relates to a locking detection circuit and a method for phase-locking loop system including a delay unit and an established logic unit, in which, the delay unit inputs phase error signals of the system to generate a current phase error signal and generate at least one delay phase error signal based on it, the established logic unit generates and sets up an un-locked instruction signal based on the current phase error signal and the delayed phase error signal, if said un-locked instruction signal is not established in a specific number of the pulse time, then a loop lock instruction signal is generated, which can adjust the tolerance to the error of static phase difference flexibly.
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