Variable frequency synthesizer with reduced phase noise
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United States of America Patent
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-
Jul 22, 1986
Grant Date -
N/A
app pub date -
Aug 14, 1985
filing date -
Aug 22, 1984
priority date (Note) -
Expired
status (Latency Note)
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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.
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