Fast switching charge pump
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United States of America Patent
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Dec 20, 1988
Grant Date -
N/A
app pub date -
Mar 14, 1986
filing date -
Mar 14, 1986
priority date (Note) -
Expired
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Abstract
A charge pump implemented in a CMOS monolithic circuit provides a precise output charging current source or current sink with fast switching characteristics. Each of two CMOS output transistors is connected via a transmission gate to a transistor having a constant current flow through it. An MOS capacitor is connected to the gates of the constant current transistors. When a transmission gate is closed, the respective output transistor is coupled to the constant current transistor in a current mirror configuration. The output transistor is quickly switched on to cause a step change in output current.
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