Low power prescaler for a PLL circuit

Details Low power prescaler for a PLL circuit Low power prescaler for a PLL circuit

1998-01-27

2000-02-29

Kinkead, Arnold

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

327159, 327160, 327231, 377 47, H03K 2100, H03K 2300

Patent

active

060314257

ABSTRACT:
A prescaler which can be used in a PLL includes a counter section and an extender section. The counter section has a pair of staged, synchronous flip-flops which generate a frequency divided signal by frequency dividing an input oscillation signal by either two or three. The extender section has a plurality of staged, asynchronous flip-flops which generates a second frequency divided signal. A switching circuit connected between the extender section and the counter section controls whether the counter section operates as either a binary counter or a ternary counter. Power conservation is achieved by limiting the counter section to only a pair of flip-flops.

REFERENCES:
patent: 5640116 (1997-06-01), Kobayashi et al.
patent: 5878101 (1999-03-01), Aisaka
patent: 5892405 (1999-04-01), Kamikubo et al.

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