Phase comparator

Details Phase comparator Phase comparator

1996-09-19

1998-08-04

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By phase

327 2, 327 7, 327 12, 324 7682, H03D 1300

Patent

active

057899479

ABSTRACT:
A phase comparator has a first comparing circuit and a second comparing circuit. The first comparing circuit produces a first output pulse having a duration equal to a phase lead of a first input signal with respect to a phase of a second input signal. The first phase comparator also produces a second output pulse equal in duration to a phase lag of the first input signal with respect to the phase of the second input signal. The second comparing circuit produces a third pulse equal in duration to a phase lead of a third input signal with respect to a phase of a fourth input signal. The second comparator also produces a fourth output pulse equal in duration to a phase lag of the third input signal with respect to the phase of the fourth input signal. The phase comparator further includes a first combining circuit for combining the first output pulse with the third output pulse, a second combining circuit for combining the second output pulse with the fourth output pulse, and a first delay circuit for relatively delaying the first input signal with respect to the third input signal. Optionally, a second delay circuit delays the fourth input signal relative to the second input signal.

REFERENCES:
patent: 3600690 (1971-08-01), White
patent: 3646455 (1972-02-01), Coccagna
patent: 3701013 (1972-10-01), Gilmore
patent: 4128812 (1978-12-01), Pavlis
patent: 4333055 (1982-06-01), Crackel
patent: 4959617 (1990-09-01), Martin
patent: 5142555 (1992-08-01), Whiteside
patent: 5539345 (1996-07-01), Hawkins

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