Circuit and method for phase locked loop charge pump biasing

Details Circuit and method for phase locked loop charge pump biasing Circuit and method for phase locked loop charge pump biasing

2006-01-24

2006-01-24

Ton, My-Trang Nu (Department: 2816)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

C327S157000

Reexamination Certificate

active

06989718

ABSTRACT:
Phase locked loops systems and control apparatus therefor are presented, in which a first charge pump bias current is generated according to a sensed VCO tuning voltage and a second generally constant bias current is provided. The provision of the first and second bias currents allows compensation for non-linear VCO tuning sensitivity. Methods are also presented for biasing a charge pump, including selectively providing a first current to the charge pump using a first current source, controlling the first current according to a VCO tuning voltage of the phase locked loop system, and providing a substantially constant second current to the charge pump.

REFERENCES:
patent: 5448598 (1995-09-01), Yousefi et al.
patent: 5631587 (1997-05-01), Co et al.
patent: 5945855 (1999-08-01), Momtaz
patent: 6115586 (2000-09-01), Bezzam et al.
patent: 6118346 (2000-09-01), Olgaard
patent: 6278333 (2001-08-01), Le et al.
patent: 6292061 (2001-09-01), Qu
patent: 6466058 (2002-10-01), Goldman
patent: 6512404 (2003-01-01), Ruegg et al.
patent: 6650156 (2003-11-01), Reid et al.
patent: 6664828 (2003-12-01), Gauthier et al.
patent: 6859108 (2005-02-01), Abbasi et al.
patent: 6876238 (2005-04-01), Kelkar et al.
patent: 2003/0119466 (2003-06-01), Goldman
“A CMOS Monolithic βΣ-Controlled Fractional-NFrequency Synthesizer for DCS-1800”, Bram de Muer and Michael S.J. Steyaert, IEEE Journal of Solid-State Circuits, vol. 37, No. 7, Jul., 2002, pp. 835-844.

Affiliated with

Also associated with

Rating

Circuit and method for phase locked loop charge pump biasing does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Circuit and method for phase locked loop charge pump biasing, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Circuit and method for phase locked loop charge pump biasing will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3526468