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

H - Electricity

03

K

328/51

H03K 23/00 (2006.01) H03K 23/66 (2006.01) H03L 7/193 (2006.01)

Patent

CA 1173917

ABSTRACT Disclosed is a digital frequency divider which operates faster than prior art dividers by reducing the propagation time of the feedback loop. The divider comprises three counters and a switching control means. A first coun- ter selects one out of first and second frequency division factors in response to a first control signal to thereby divide an input signal frequency. The second counter frequency divides the output of the first counter by a third frequency division factor. The third counter frequency divides the output of the first counter by a fourth frequency division factor which is smaller than the third frequency division factor. The switching control means converts the output of the third counter into a signal synchronized with the output of the first counter and supplies the converted signal to the first counter as the first control signal. Also disclosed is a frequency synthesizer using the dig- ital frequency divider.

381150

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