Method and apparatus for performing fractional division charge c

Details Method and apparatus for performing fractional division charge c Method and apparatus for performing fractional division charge c

1998-12-28

2000-10-10

Wambach, Margaret R.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synthesizer

327115, 327117, 327148, 327149, 327150, 377 48, H03B 2100

Patent

active

061305618

ABSTRACT:
Compensating for phase nonalignment between VCO frequency divider and referenced frequency signal in a fractional-N PLL is provided by compensation implemented by a variable charge pump system. Phase comparator logic is configured to turn ON some of the charge pumps of the charge pump system early and the rest of the charge pumps later. This process effects an equivalent charge being turned ON at the exact point in time for properly compensating for the fractional charge.

REFERENCES:
patent: 5180993 (1993-01-01), Demt
patent: 5465061 (1995-11-01), DuFour
patent: 5781048 (1998-07-01), Nakao
patent: 5834987 (1998-11-01), Dent
patent: 5861766 (1999-01-01), Baumer et al.

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