Spark current cancellation in charge pump of high speed...

Details Spark current cancellation in charge pump of high speed... Spark current cancellation in charge pump of high speed...

2005-10-25

2005-10-25

Nguyen, Minh (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S310000, C375S376000

Reexamination Certificate

active

06958637

ABSTRACT:
A structure and associated method to control spark current in a phase lock loop circuit. The phase lock loop circuit includes a voltage controlled oscillator, a phase comparator circuit, and a charge pump circuit. The voltage controlled oscillator is adapted to provide a first signal comprising a first frequency. The phase comparator is adapted to compare the first signal comprising the first frequency to a reference signal comprising a reference frequency. The phase comparator is further adapted to provide a control signal representing a phase difference between the first signal and the reference signal. The charge pump circuit is adapted to receive the control signal and control the voltage controlled oscillator such that a phase of the first signal equals a phase of the reference signal. The charge pump circuit is further adapted to compensate for a spark current resulting from a switching mode of the control signal.

REFERENCES:
patent: 5646563 (1997-07-01), Kuo
patent: 5767736 (1998-06-01), Lakshmikumar et al.
patent: 5886551 (1999-03-01), Narahara
patent: 6107849 (2000-08-01), Williams et al.
patent: 6222402 (2001-04-01), Boerstler et al.
patent: 6509770 (2003-01-01), Gossmann et al.
patent: 6774730 (2004-08-01), Gasparik

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