PLL with stable phase discriminator

Details PLL with stable phase discriminator PLL with stable phase discriminator

1993-11-16

1995-07-25

Pascal, Robert J.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 25, 331 18, 327 2, 327 3, 327 7, 327 12, H03L 700, H03L 7089

Patent

active

054365961

ABSTRACT:
A phase-locked-loop (PLL) with stable phase discrimination includes a charge pump with a current source and current sink to control a VCO, and a phase discriminator to compare the VCO's signal to a stable reference signal for controlling the charge pump. The phase discriminator includes a resettable D-flipflop to provide the current source control signal and a resettable D-flipflop to provide the current sink control signal. The reset signal keeps both sink and source temporarily alive to avoid a dead zone region. The reset signal is produced under the combined control of the sink and source control signals and, in addition, of the reference signal to enhance stability.

REFERENCES:
patent: 4105947 (1978-08-01), Crowley
patent: 4814726 (1989-03-01), Byrd et al.
patent: 5124594 (1992-06-01), Numata et al.
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