Frequency synthesizer

Details Frequency synthesizer Frequency synthesizer

1981-12-16

1984-12-11

Zazworsky, John

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural oscillators controlled

331 4, 331 11, 331 25, 331 47, 331 60, 328 14, H03L 718

Patent

active

044881231

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.

REFERENCES:
patent: 4180783 (1979-12-01), Khalifa

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