Patent ID: 7514984

Claim:
A charge pumping circuit comprising: a source transistor configured to output an input voltage in accordance with a first clock signal; a source capacitor, comprising a first electrode connected to the gate of the source transistor and a second electrode configured to receive the first clock signal; a driver configured to drive the source transistor using the input voltage, the first clock signal, and a second clock signal different from the first clock signal, the driver comprising a switching transistor controlled by the first clock signal and connected between the gate and drain of the source transistor; and a voltage pumping unit configured to increase the voltage output from the source transistor in stages in accordance with the first and second clock signals, each stage having a transmission transistor having the gate and drain thereof electrically shorted, wherein the driver is further configured to electrically connect the gate and drain of the source transistor to each other and to supply the input voltage to the gate of the source transistor in accordance with the first clock signal, and to supply a gate voltage to the gate of the source transistor in accordance with the first clock signal, and the source and switching transistors are transistors of different doping types.