Charge pump with transient current correction

Details Charge pump with transient current correction Charge pump with transient current correction

2007-01-09

2007-01-09

Bocure, Tesfaldet (Department: 2611)

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

C327S150000

Reexamination Certificate

active

10268258

ABSTRACT:
An improved charge pump used in a phase-locked loop includes transient current correction capability by adding a canceling capacitance for each parasitic capacitance associated with a switching device in a charge pump. For each transient current component flowing through the parasitic capacitance, a canceling capacitance is implemented to create a canceling transient current component in the opposite direction such that it cancels out the transient current component. Preferably, an additional switching device is added to implement such a canceling capacitance for each parasitic capacitance.

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Alvarez, J. et al.; “A Wide-Bandwidth Low-Voltage PLL for PowerPC Microprocessors”;IEEE JCCS; Apr. 1995; vol. SC-30; pp. 383-391.

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