Fractional frequency divider

Details Fractional frequency divider Fractional frequency divider

1983-11-18

1986-02-25

Heyman, John S.

Electrical pulse counters, pulse dividers, or shift registers: c

Systems

Pulse multiplication or division

377 50, H03K 2348

Patent

active

045731764

ABSTRACT:
A fractional divider which functions as a prescaler in a phase lock loop-based frequency synthesizer provides a selectable prescaling factor to the divide-by-N programmable divider. The prescaling factor can assume either the value 2 or 2+1/N. The fractional division, occurring in front of the programmable divider, permits a periodic signal to be generated by that device, while recapturing the frequencies lost to prescaling. When operating in the divide-by-(2+1/N) mode, the fractional divider drops one input clock pulse each time the output signal of the programmable divider assumes a predetermined binary state.

REFERENCES:
patent: 3446947 (1969-05-01), Overstreet, Jr.
patent: 3769597 (1973-10-01), Mayer
patent: 4399549 (1983-08-01), Srivastava
patent: 4406014 (1983-09-01), Doron
patent: 4409564 (1983-10-01), Lo
patent: 4423381 (1983-12-01), Stepp et al.
patent: 4468632 (1984-08-01), Crowley
patent: 4468797 (1984-08-01), Shin

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