Phase locked loop lock-detection circuit

Details Phase locked loop lock-detection circuit Phase locked loop lock-detection circuit

2007-06-05

2007-06-05

Callahan, Timothy P. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By phase

C327S003000

Reexamination Certificate

active

10792006

ABSTRACT:
An improved clock lock detection circuit is disclosed. The circuit has a first input indicating an edge of a first clock and a second input indicating a corresponding edge of a second clock wherein the second clock is expected to be synchronized with the first clock with an allowable time difference. Further, it has a difference generation module for generating a difference signal based on the time difference between the first and second inputs, and a voltage divider module for receiving the difference signal and generating an indication voltage which varies based on a change of the time difference between the first and second inputs.

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patent: 6566920 (2003-05-01), Kim

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