Patent ID: 7046076

Claim:
An apparatus for generating a supply voltage internally within an integrated circuit comprising: a charge pump stage structure having a pumping capacitor connected to a pumping node, a first PMOS device connected between an input node and said pumping node, said first PMOS device configured to electrically communicate with said pumping capacitor, wherein said first PMOS device is configured to connect said pumping node to said input node when said pumping capacitor is not boosted; a second PMOS device connected between an output node and said pumping node, said second PMOS device configured to electrically communicate with said pumping capacitor, said second PMOS device configured to transfer electrical charge from said pumping node to said output node when said pumping capacitor is boosted, said second PMOS device having a gate terminal connected to a pumping node of another charge pump stage structure of a symmetrical charge pump, wherein said second PMOS device is configured to prevent reverse current feedback from said output node to said pumping node when said pumping capacitor is not boosted; and a third PMOS device configured to electrically communicate with said first PMOS device, wherein said third PMOS device is configured to connect said pumping node to a gate terminal of said first PMOS device to prevent current feedback from said pumping node to said input node.