Synchronized frequency synthesizer with high speed lock

Details Synchronized frequency synthesizer with high speed lock Synchronized frequency synthesizer with high speed lock

1980-02-20

1982-05-18

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 14, 331 16, 331 17, 331 25, H03L 718

Patent

active

043307582

ABSTRACT:
An improved frequency synthesizer utilizes a first order loop and sample-and-hold phase detector with optimized gain to obtain very fast frequency locking characteristics. In addition, synchronization of the programming of the loop divider and of the range shifting the voltage controlled oscillator is also utilized. An adaptive loop filter is provided to allow a first order loop to be used for lock acquisition and still maintain excellent noise performance after lock has been obtained.

REFERENCES:
patent: 3729688 (1973-04-01), Cerny, Jr. et al.
patent: 3893040 (1975-07-01), Harp
patent: 4105948 (1978-08-01), Wolkstein
patent: 4115745 (1978-09-01), Egan
patent: 4117420 (1978-09-01), DeKoninck et al.
patent: 4123724 (1978-10-01), Das et al.
patent: 4126831 (1978-11-01), Cochran
patent: 4131862 (1978-12-01), Black et al.
patent: 4205272 (1980-05-01), Kumagai
Berlin, "Phase-Locked Loop With Experiments", E & L Instruments, Inc., Derby, Connecticut, 1978, pp. 3-3, 3-4, 4-1, 4-2.

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