Clock signal phase comparator

Details Clock signal phase comparator Clock signal phase comparator

1997-10-03

2000-07-11

Wells, Kenneth B.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By phase

327 7, 327 12, 327158, G01R 2500

Patent

active

060878576

ABSTRACT:
A clock signal phase comparator includes a first delay unit for delaying a clock signal for a predetermined time, a first phase detector for comparing an output signal of the first delay unit and a reference clock signal and outputting a first high or low level output signal, a second delay unit for delaying for a predetermined time and outputting the reference clock signal, and a second phase detector for comparing an output signal of the second delay unit and the clock signal and outputting a second high or low level output signal. The phase comparator separately displays the phase comparison results in grades of fast, slow and locking, and when a locked phase is detected, the phase control system is partially or entirely disabled, for thereby reducing current consumption of the system.

REFERENCES:
patent: 3600690 (1971-08-01), White
patent: 4380083 (1983-04-01), Anderson et al.
patent: 5223755 (1993-06-01), Richley
patent: 5440274 (1995-08-01), Bayer
patent: 5455540 (1995-10-01), Williams
patent: 5570054 (1996-10-01), Takla
patent: 5619148 (1997-04-01), Guo
patent: 5663665 (1997-09-01), Wang et al.
patent: 5789947 (1998-08-01), Sato

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