Phase detector insensitive to missing pulses

Details Phase detector insensitive to missing pulses Phase detector insensitive to missing pulses

1984-06-11

1986-04-15

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

328133, 331 27, H03D 1300

Patent

active

045830533

ABSTRACT:
A phase detector for use with a phase locked loop where the input has missing pulses. The detector processes two input frequencies and generates either a pump-up or a pump-down signal on separate outputs. The reference input may have missing transitions, as often happens in recovering the clock from encoded data. The phase detector comprises three bistable flip-flops and a gate interconnected to respond to the two input frequencies to produce either a pump-up pulse of variable width proportional to the phase difference between the pulses of the two input frequencies or a fixed width pump-down pulse.

REFERENCES:
patent: 3614635 (1971-10-01), La Pine et al.
patent: 3986125 (1976-10-01), Eibner
patent: 4371974 (1983-02-01), Dugan
patent: 4380815 (1983-04-01), Clendening
patent: 4408165 (1983-10-01), Braun

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