Stabilized frequency synthesizer

Details Stabilized frequency synthesizer Stabilized frequency synthesizer

1994-06-15

1995-04-25

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

331 11, 331 17, 331 25, 331 34, 331 96, 331107DP, 331108R, 331177R, H03B 518, H03L 707, H03L 7087, H03L 718

Patent

active

054102774

ABSTRACT:
A frequency synthesizer, which controls the fluctuation of frequency not only of a long period but also a short period, ensures a wide frequency control range and can be realized at a low cost, can be obtained. The frequency synthesizer includes a first control circuit and a second control circuit, the first control circuit having a first variable frequency divider connected between a coupler for extracting a part of an oscillator and a main coil disposed within a magnetic circuit, a first phase detector, a first reference signal generator, a first loop filter and a first coil driving circuit and the second control circuit having a second variable frequency divider connected between said coupler and a sub-coil disposed in said magnetic circuit, a second phase detector, a second reference signal generator, a second loop filter and a second coil driving circuit in order to share the roles in such a manner that the first control circuit controls the fluctuation of the long period frequency, while the second control circuit controls the fluctuation of the short period frequency.

REFERENCES:
patent: 4366467 (1982-12-01), Cushman
patent: 4571552 (1986-02-01), Brown
patent: 4602220 (1986-07-01), Kurihara
patent: 4728906 (1988-03-01), Turl et al.
patent: 4873496 (1989-10-01), Ohgihara et al.
patent: 4887052 (1989-12-01), Murakami et al.
patent: 4890071 (1989-12-01), Curtis
patent: 4918405 (1990-04-01), Herleikson
patent: 5130670 (1992-07-01), Jaffe

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