Fast phase-lock frequency synthesizer with variable sampling eff

Details Fast phase-lock frequency synthesizer with variable sampling eff Fast phase-lock frequency synthesizer with variable sampling eff

1985-07-17

1987-01-06

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

307516, 328134, 328151, 331 8, 331 14, 331 17, 331 27, H03L 718

Patent

active

046349987

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 includes sample-and-hold circuitry (FIG. 6) having variable efficiency. Specifically, the sample-and-hold circuitry provides a sampling pulse of variable width which is controlled to be wider during acquisition and narrower during steady-state operation.

REFERENCES:
patent: 4001713 (1977-01-01), Egan
patent: 4115745 (1978-09-01), Egan
patent: 4290028 (1981-09-01), LeGrand
patent: 4330758 (1982-05-01), Swisher et al.
patent: 4382234 (1983-05-01), Olbrechts
patent: 4434407 (1984-02-01), Healey, III et al.
patent: 4496912 (1985-01-01), Wynn
G. C. Gillette, Digiphase Synthesizer, Frequency Technology, Aug. 1969, pp. 25-29.
Fairchild ECL, 11C90/11C91, Making Programmable UHF Counters when None are Available or . . . Pulse Swallowing Revisited, Fairchild ECL Catalog, pp. 9-56 through 9-58.
U. Rhode, Low-Noise Frequency Synthesizers Using Fractional N Phase-Locked Loops, r.f. design, Jan./Feb., 1981, pp. 20-34.
D. D. Danielson, S. E. Froseth, A Synthesized Signal Source with Function Generator Capabilities, Hewlett-Packard Journal, Jan. 1979, pp. 18-26.
J. Gorski-Popiel, Frequency Synthesis: Techniques and Applications, IEEE Press, 1975, pp. 72-91.

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