Charge pump with reduced energy consumption through charge sharing and clock boosting suitable for high voltage word line in flash memories
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United States of America Patent
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Dec 25, 2012
Grant Date -
Jan 27, 2011
app pub date -
Jul 24, 2009
filing date -
Jul 24, 2009
priority date (Note) -
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Abstract
A charge pump circuit for generating an output voltage is described. Charge pump circuits typically have two branches. As the clocks supplying the branches of a charge pump circuit alternate, the output of each branch will alternately provide an output voltage, which are then combined to form the pump output. The techniques described here allow charge to be transferred between the two branches, so that as the capacitor of one branch discharges, it is used to charge up the capacitor in the other branch. An exemplary embodiment using a voltage doubler-type of circuit, with the charge transfer between the branches accomplished using a switch controller by a boosted version of the clock signal, which is provided by a one-sided voltage doubler.
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