OPTIMUM STRUCTURE FOR CHARGE PUMP CIRCUIT WITH BIPOLAR OUTPUT
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United States of America Patent
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Issued Date -
Nov 5, 2009
app pub date -
May 1, 2008
filing date -
May 1, 2008
priority date (Note) -
Abandoned
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Abstract
A charge pump circuit with bipolar output comprises a first switch capable of selectively connecting a first input terminal of a transfer capacitor to a voltage source, a second switch capable of selectively connecting a first input terminal of a first storage capacitor to said first input terminal of said transfer capacitor; a third switch capable of selectively connecting a second input terminal of said transfer capacitor to said voltage source; a fourth switch selectively connecting said second input terminal of said transfer capacitor to a ground terminal; and a fifth switch selectively connecting said second input terminal of said transfer capacitor to a second input terminal of a second storage capacitor. The charge pump circuit is collocated with clock signals to be selectively driven by a four-phase signal so as to produce bipolar voltages with magnitudes higher than the input voltage with minimum number of switches and capacitors and also accomplish the highest efficiency.
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