Symmetric charge pump

Details Symmetric charge pump Symmetric charge pump

2006-03-21

2006-03-21

Cunningham, Terry D. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S148000

Reexamination Certificate

active

07015736

ABSTRACT:
A charge pump is disclosed which generates higher and more symmetric source and sink currents that prior designs and reduces the multiple frequency sidebands that occur in a voltage controlled oscillator of a phase-loop synthesizer. Other improvements are the reduction in reference frequency feed-through, charge sharing and noise transient coupling and phase noise in the phase-locked loop. Possible applications include but are not limited to charge pump phase-locked designs for single chip CMOS multi-band and multi-standard radio frequency integrated circuits.

REFERENCES:
patent: 6426614 (2002-07-01), Guthrie
patent: 6636105 (2003-10-01), Soda
patent: 6747506 (2004-06-01), Thiara
patent: 6856182 (2005-02-01), Moyal
patent: 2002/0089382 (2002-07-01), Yang
Chih-Ming Hung and Kenneth K.O., “A Fully Integrated 1.5V 5.5 GHz CMOS Phase-Locked Loop”, IEEE Journal of Solid-State Circuits, vol. 37, No. 4, Apr. 2002.
William B. Wilson, Un-Ku Moon, Kadaba R. Lakshmikumar and Liang Dai, “A CMOS Self-Calibrating Frequency Synthesizer,” IEEE Journal of Solid-State Circuits, vol. 35, No. 10, Oct., 2000.

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