Variable frequency synthesizer with reduced phase noise

Details Variable frequency synthesizer with reduced phase noise Variable frequency synthesizer with reduced phase noise

1985-08-14

1986-07-22

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

With reference oscillator or source

331 25, 331 47, 331 50, 331 76, H03L 716

Patent

active

046022201

ABSTRACT:
A reference signal from a reference signal source is supplied to a frequency transformer and a side band signal generator. The frequency transformer is formed mainly by up-converters and produces a frequency m times as high as the frequency f.sub.s of the reference signal. The side band signal generator outputs signals of base and harmonic frequencies f.sub.s, 2f.sub.s, 3f.sub.s, . . . and nf.sub.s (where n is less than m) and produces less phase noise than does the frequency transformer. The outputs of the frequency transformer and the side band signal generator are frequency mixed by a frequency mixer, and one frequency component in the frequency-mixed output is selected by a variable filter.

REFERENCES:
patent: 3365676 (1968-01-01), Buss
patent: 3676794 (1972-07-01), Bidell et al.
patent: 4458329 (1984-07-01), Remy
patent: 4551689 (1985-11-01), Scala et al.

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