Clock synchronizing circuit

Details Clock synchronizing circuit Clock synchronizing circuit

1994-01-26

1995-12-12

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327150, 327362, 327512, H03L 708

Patent

active

054753252

ABSTRACT:
A clock synchronizing circuit includes a voltage controlled oscillator (VCO) for producing an output signal whose oscillation frequency changes in response to control signals. A phase comparator compares a phase of an input signal and a phase of the output signal to thereby generate a phase difference signal. A filter filters the phase difference signal to thereby output a filtered phase difference signal. A frequency synchronizing circuit responsive to the filtered phase difference signal generates a first compensation signal for controlling a frequency of the output signal. A phase synchronizing circuit responsive to the filtered phase difference signal generates a second compensation signal for controlling a phase of the output signal. A signal supplying circuit feeds the first and second compensation signals as the control signals.

REFERENCES:
patent: 3725789 (1973-04-01), Mager
patent: 4310804 (1982-01-01), Ryon
patent: 4563657 (1986-01-01), Oureshi et al.
patent: 4808884 (1989-02-01), Hull et al.
patent: 4855683 (1989-08-01), Troudet et al.
patent: 5018170 (1991-05-01), Wilson
patent: 5024535 (1991-06-01), Winston, Jr.
patent: 5168245 (1992-12-01), Koskowich
patent: 5268601 (1993-12-01), Cossius

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