Digital phase comparator/charge pump with zero deadband and mini

Details Digital phase comparator/charge pump with zero deadband and mini Digital phase comparator/charge pump with zero deadband and mini

1987-08-17

1989-03-21

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 17, 331 27, 307516, H03L 718

Patent

active

048147265

ABSTRACT:
A phase detector and charge pump combination is disclosed for use in a digital phase locked loop system. The phase detector includes a reset circuit that responds to the charge pump condition where it is simultaneously sourcing and sinking current. The pump up and down circuits are fast acting and balanced so that minimum conduction is employed for the phase lock condition.

REFERENCES:
patent: 3610954 (1971-10-01), Treadway
patent: 4354124 (1982-10-01), Shima et al.
patent: 4524333 (1985-06-01), Iwata et al.

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