Charge pump circuit for compensating mismatch of output currents
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United States of America Patent
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Jan 24, 2006
Grant Date -
May 6, 2004
app pub date -
Aug 26, 2003
filing date -
Aug 26, 2002
priority date (Note) -
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Abstract
The present invention is to provide a charge pump circuit for improving switching speed and compensating mismatch between a source and a sink currents flowing to output terminal. A charge pump circuit according to the first embodiment of the present invention comprises a first and second switching elements, a discharging and charging elements, a biasing unit, a first and second compensating unit, a charge pumping unit, a current mirror unit, a control unit, and a biasing unit. The compensating circuit removes the deterioration owing to the parasitic capacitance, and the control circuit controls the charge that is flowed or emitted from the parasitic capacitance. A charge pump circuit according to the second embodiment of the present invention comprises a charge pumping unit, a current mirror unit, a control unit a biasing unit. The charge pump circuit decects the mismatch between the output currents via the control unit, and compensates the mismatch by the biasing unit.
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