Phase-frequency compare circuit for phase lock loop

Details Phase-frequency compare circuit for phase lock loop Phase-frequency compare circuit for phase lock loop

1987-05-12

1989-02-14

Laroche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

328133, 307528, H03L 700

Patent

active

048049280

ABSTRACT:
A phase-locked loop circuit having a charge pump and a voltage controlled oscillator which includes a phase/frequency comparator having a single circuit for operating in phase or frequency modes and which uses the discharge signal from the oscillator flip flop to trigger resetting of the input flip flop and which uses a one-shot in the phase compare mode for high frequency operation.

REFERENCES:
patent: 4593254 (1986-06-01), Coburn
patent: 4594563 (1986-06-01), Williams

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