Fast tuning YIG frequency synthesizer

Details Fast tuning YIG frequency synthesizer Fast tuning YIG frequency synthesizer

1994-11-29

1996-04-16

Pascal, Robert J.

Oscillators

Beat frequency

331 43, 331 19, 331 96, 331179, 327105, 455313, 455315, 364721, H03B 1900

Patent

active

055086616

ABSTRACT:
A frequency synthesizer using a fixed oscillator driving a comb line generator to generate a spectrum of comb lines, one of which is selected by a switched array of fixed-tuned, YIG passband filters. The selected comb line is combined in a mixer with a signal from a local oscillator, which, preferably, is a direct digital synthesizer. The output of the mixer is fed to another switched array of fixed-tuned YIG passband filters where only the desired sideband is selected and the comb line and the other sideband is filtered out. In various alternative embodiments, tunable YIG filters are substituted for each array. Some embodiments also use a reverse slope equalizer to break up the coherent energy in the comb line spectrum at the output of the comb line generator to allow RF amplification to be applied without saturating the amplifier.

REFERENCES:
patent: 3777271 (1973-12-01), Telewski
patent: 4105949 (1978-08-01), Hardin
patent: 4791377 (1988-12-01), Grandfield et al.
patent: 4926130 (1990-05-01), Weaver
patent: 5166629 (1992-11-01), Watkins et al.

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