Phase comparator, phase synchronizing circuit, and...

Details Phase comparator, phase synchronizing circuit, and... Phase comparator, phase synchronizing circuit, and...

2008-12-22

2010-12-21

Donovan, Lincoln (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By phase

C327S003000, C327S007000, C327S012000, C327S018000, C327S020000, C327S156000, C331S025000

Reexamination Certificate

active

07855580

ABSTRACT:
A phase comparator includes an edge detecting unit to which a reference signal is input and to which a referred signal based on the reference signal is input as a feedback signal. The edge detecting unit detects an edge of the reference signal and an edge of the referred signal. The phase comparator also includes a phase-difference detecting unit that detects a phase difference between the edge of the reference signal and the edge of the referred signal. The phase comparator also includes a phase-difference-signal output unit that outputs a phase-difference signal for current control based on the phase difference. The phase comparator also includes an input-break detecting unit that detects an input break of the reference signal when an edge of the referred signal is again detected after an edge of the referred signal is detected and before an edge of the reference signal is detected.

REFERENCES:
patent: 5410572 (1995-04-01), Yoshida
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patent: 6791421 (2004-09-01), Oita
patent: 7038508 (2006-05-01), Parker et al.
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patent: 2006-253869 (2006-09-01), None

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