Bottom plate regulation of charge pumps
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United States of America Patent
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Oct 25, 2011
Grant Date -
Mar 5, 2009
app pub date -
Aug 28, 2007
filing date -
Aug 28, 2007
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Techniques of operating a charge pump are described. The charge pump is connectable to receive a clock signal and a regulating voltage and provide an output voltage. The charge pump can have one or multiple stages, each of the stages will include a capacitor. During the charging phase, the regulating voltage is used to regulate the potential of the capacitor's bottom plate. During the boosting phase, the capacitor's top plate is connected to supply the output for the stage and the bottom plate is connected to receive the stage's input. Each stage will also have a set of switching elements, allowing the capacitor to be alternately connected in the charging and boosting phases. For the first stage, the input is derived from the clock signal, and for any subsequent stages, the input will be the output of the preceding stage. The last stage provides the output voltage of the pump.
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