Charge pump system
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United States of America Patent
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Jan 7, 1997
Issued Date -
N/A
app pub date -
Aug 11, 1995
filing date -
Sep 7, 1994
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A charge pump system for charging an integrating capacitor includes a current source for supplying a first current of a first polarity, a second current of the opposite polarity which is a fraction of the first current, a third current of the opposite polarity, and a fourth current of the first polarity which is a fraction of the third current, and a switching device for simultaneously interconnecting both the first and second currents to the integrating capacitor to provide a first pump down charging current which is the fractional difference between the first and second currents, and also alternately selectively interconnecting both the third and fourth currents to the integrating capacitor to provide a second pump up charging current which is a fractional difference between the third and fourth currents and opposite in polarity to the first charging current.
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