Frequency synthesizer
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United States of America Patent
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-
Dec 11, 1984
Grant Date -
N/A
app pub date -
Dec 16, 1981
filing date -
Dec 29, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The output from a first variable frequency oscillator is frequency divided by a variable frequency divider and the frequency-divided output is phase compared by a first phase comparator with a first reference signal. By the phase-compared output is controlled a second variable-frequency oscillator of higher frequency stability than that of the first variable frequency oscillator. The output from the first variable oscillator is frequency divided by another frequency divider and the frequency-divided output is phase compared by a second phase comparator on the basis of the output from the second variable frequency oscillator and, by the phase-compared output, the first variable frequency oscillator is controlled. By changing the frequency dividing ratio of the variable frequency divider, the oscillation frequency of the first variable frequency oscillator is set.
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