Phase comparator and semiconductor device with phase comparator

Details Phase comparator and semiconductor device with phase comparator Phase comparator and semiconductor device with phase comparator

2005-03-10

2009-11-24

Donovan, Lincoln (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By phase

C327S012000

Reexamination Certificate

active

07622959

ABSTRACT:
It is an object of the present invention to improve the phase difference detection accuracy of a phase comparator. A phase difference signal generation circuit outputs a signal C_SIGNAL which takes a high level for a period corresponding to the phase difference between the comparison target signals COMP1and COMP2to the control terminal of a tri-state buffer, based on a signal synchronous with the start-up of the comparison target signal COMP1detected by an edge detection flag generation circuit and a signal synchronous with the start-up of the comparison target signal COMP2detected by an edge detection flag generation circuit. A status management circuit outputs a signal A_SIGNAL corresponding to the phase advance or delay of the comparison target signals COMP1and COMP2to the input terminal of the tri-state buffer.

REFERENCES:
patent: 6259754 (2001-07-01), Jeong
patent: 03-101517 (1991-04-01), None
patent: 04-241520 (1992-08-01), None
patent: 2001-007699 (2001-01-01), None
Ken Bigelow, Deriving the XOR function, http://www.play-hookey.com/digital/xor—function.html, copyright 1996.

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