Fast phase-lock frequency synthesizer

Details Fast phase-lock frequency synthesizer Fast phase-lock frequency synthesizer

1986-12-22

1988-09-13

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 8, 331 14, 331 17, 331 27, H03L 718

Patent

active

047712481

ABSTRACT:
A phase-locked frequency synthesizer (10) having a voltage controlled oscillator (40), a divider circuit (60), and a sample-and-hold phase detector (30, 80, 90, 100, 110) which utilizes gain compensation (90,110) for optimizing phase-locking speed. The sample-and-hold circuit (FIG. 6) also includes circuitry for substantially reducing perturbations at its output. The frequency synthesizer further includes control circuitry (70) and a reference frequency generator (20) for quickly reinitializing the synthesizer in response to a command to change frequency.

REFERENCES:
patent: 4313209 (1982-01-01), Drucker
patent: 4382234 (1983-05-01), Olbrechts
patent: 4392113 (1983-07-01), Jackson
patent: 4568888 (1986-02-01), Kimura et al.

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