Phase comparator

Details Phase comparator Phase comparator

1997-09-26

1998-07-21

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By phase

327142, 327156, 326104, H03K 19003

Patent

active

057839506

ABSTRACT:
A reset signal generating circuit included in a phase comparator of a PLL circuit includes fourth and second transistors having their respective gates connected to the gates of first and third transistors in a crossed form. A reset signal is output through first and third transistors and through fourth and second transistors in response to output of signals UP and DOWN. Accordingly, the time period between the output of signals UP, DOWN, and the output of the reset signal is made constant regardless of which of the signals UP and DOWN has been output first.

REFERENCES:
patent: 3610954 (1971-10-01), Treadway
patent: 3986043 (1976-10-01), Buckley, III et al.
patent: 5274277 (1993-12-01), Chan

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