Digital frequency divider suitable for a frequency synthesizer

Details Digital frequency divider suitable for a frequency synthesizer Digital frequency divider suitable for a frequency synthesizer

1981-06-25

1986-12-30

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

With reference oscillator or source

328155, 377 44, 377 47, H03L 718, H03K 2100

Patent

active

046331948

ABSTRACT:
The frequency divider includes a first or prescaling counter which selects between first and second frequency division factors, in response to a first control signal, and then divides an input signal frequency responsive to the first control signal. A second and programmable counter frequency divides the output of the first or prescaling counter by a third frequency-division factor. A third and programmable counter frequency divides the output of the first counter by a fourth frequency-division factor which is smaller than the third frequency-division factor. A switching control circuit then converts the output of the third counter and supplies the converted signal to the first counter, as the first control signal. The digital frequency divider is suitable for use a part of a phase-locked loop frequency synthesizer.

REFERENCES:
patent: 4184068 (1980-01-01), Washburn
patent: 4344045 (1982-08-01), Das et al.

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