Ultra low noise frequency divider/multiplier

Details Ultra low noise frequency divider/multiplier Ultra low noise frequency divider/multiplier

1993-04-22

1994-08-16

Nelli, Raymond A.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

331 1A, 331 17, H03L 700

Patent

active

053390490

ABSTRACT:
Frequency divider and multiplier circuits are provided comprising a voltage controlled oscillator, a presteer circuit comprising a frequency comparator, a sampling phase detector circuit comprising a sampler, a pair of prescalers for providing frequencies in the divider/multiplier circuits by a predetermined number D, a programmable divider for dividing one of the frequencies in the divider/multiplier circuits by a selectable N and a summing circuit. In operation, the presteer circuit drives the VCO toward a predetermined frequency. When the VCO reaches a predetermined frequency, the output of the presteer circuit is disabled and the sampling phase detector takes over, locking the VCO to the predetermined desired frequency.

REFERENCES:
patent: 5207491 (1993-05-01), Rottingham
patent: 5208555 (1993-05-01), Graham et al.
patent: 5266907 (1993-11-01), Dacus
patent: 5268652 (1993-12-01), Lafon
patent: 5278520 (1994-01-01), Parker et al.

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