Fast hopping microwave frequency synthesizer

Details Fast hopping microwave frequency synthesizer Fast hopping microwave frequency synthesizer

1988-11-21

1989-10-03

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 16, 331 18, 331 25, H03L 718

Patent

active

048719811

ABSTRACT:
A microwave frequency synthesizer which simultaneously provides increased frequency coverage, reduced channel spacings and improved settling times with a single phase-locked-loop. A VCO and a parametric divider enables a wide frequency coverage to be used in a phase-locked-loop. The fast hopping capability is primarily derived from the wide loop bandwidth which, in turns, is permitted by using a high reference frequency. The small channel spacings are created by using a 90.degree. phase shifter installed in the feedback path of the phase-locked-loop. The 90.degree. phase shifter permits channel spacings as small as 1/4 the reference frequency value.

REFERENCES:
patent: 3798550 (1974-03-01), Takaoka
patent: 3979691 (1976-09-01), Balliet
patent: 3983506 (1976-09-01), Rettinger, Jr. et al.
patent: 4072909 (1978-02-01), Citta
patent: 4262264 (1981-04-01), Vandegraaf
patent: 4336505 (1982-06-01), Meyer
patent: 4409563 (1983-10-01), Vandegraaf
patent: 4647874 (1987-03-01), Rittenbach
patent: 4733197 (1988-03-01), Chow

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