Frequency synthesizer having frequency control loop including fi

Details Frequency synthesizer having frequency control loop including fi Frequency synthesizer having frequency control loop including fi

1976-07-30

1977-08-16

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 9, 331175, H03B 304

Patent

active

040428915

ABSTRACT:
A frequency synthesizer or programmable multiple frequency source which uses a voltage-controlled oscillator (VCO) responsive to an independent control variable. The VCO is also responsive to control from an error loop circuit which derives an additional control voltage as a result of comparing the VCO frequency at any time with one of the phase delay multiples of a fiber optic delay line. The independent variable used to select an overall frequency desired controls the VCO directly to an approximate frequency and the fiber optic delay line and error generating loop associated therewith operates as an automatic vernier on the VCO to bring it into phase-lock with the nearest frequency which is a multiple of the reciprocal of the fiber optic line delay time.

REFERENCES:
patent: 3809908 (1974-05-01), Clanton
patent: 3852681 (1974-12-01), Underhill
Underhill, "Delay-Stabilized Variable Oscillator", Electronics Letters, vol. 8, Mar. 9, 1972.

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