Phase comparison circuit for maintaining a stable phase locked l

Details Phase comparison circuit for maintaining a stable phase locked l Phase comparison circuit for maintaining a stable phase locked l

1995-04-25

1997-01-07

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By phase

327 7, 327157, 327159, 331 1A, 331 25, H03D 1300, H03K 526, H03L 706

Patent

active

055921108

ABSTRACT:
A phase comparison circuit used in a phase locked loop circuit which realizes a stable phase locked loop circuit without changing the output frequency of a voltage-controlled oscillator, even if an input pulse is missing. The phase comparison circuit includes a circuit for generating a first pulse at each rising edge of an input signal, a circuit for generating a second pulse at each falling edge of the input signal, a circuit for generating a third pulse at each falling edge of a reference signal, a circuit for generating a first output signal from the first pulse and the second pulse, and a circuit for generating a second output signal from the first pulse and the third pulse. The output signals are not increased even if an input pulse is missing so that the operation of the phase locked loop circuit remains stable.

REFERENCES:
patent: 3922610 (1975-11-01), Buchan et al.
patent: 4020422 (1977-04-01), Underhill
patent: 4531102 (1985-07-01), Whitlock et al.
patent: 4583053 (1986-04-01), Yarborough, Jr.
patent: 4594563 (1986-06-01), Williams
patent: 4668917 (1987-05-01), Levine
patent: 4984255 (1991-01-01), Davis et al.
patent: 5266851 (1993-11-01), Nukui

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