Patent ID: 7436239

Claim:
A charge pump circuit, comprising a plurality of boosting circuit units connected in series, the boosting circuit units comprising a first stage unit which comprises: a charge transfer MOSFET of the first stage; a second resistor connected between a drain and a gate of the charge transfer MOSFET of the first stage; and a second capacitor connected with the gate of the charge transfer MOSFET of the first stage, and the boosting circuit units further comprising a last stage unit which comprises: a charge transfer MOSFET of the last stage; a first capacitor connected to a source of the charge transfer MOSFET of the last stage; a second resistor connected between a drain and a gate of the charge transfer MOSFET of the last stage; and a second capacitor connected to the gate of the charge transfer MOSFET of the last stage, and the boosting circuit units further comprising at least one intermediate stage unit which each comprises: a charge transfer MOSFET of the intermediate stage; a first capacitor connected with a source of the charge transfer MOSFET of the intermediate stage; a first resistor connected between a source and a gate of the charge transfer MOSFET of the intermediate stage; a second resistor connected between the drain and the gate of the charge transfer MOSFET of the intermediate stage; and a second capacitor connected with the gate of the charge transfer MOSFET of the intermediate stage, wherein a pair of first clock pulses whose phases are reversed to each other are supplied to the first capacitors of adjacent two units of the boosting circuit units, and wherein a pair of second clock pulses whose phases are reversed to each other are supplied to the second capacitors of adjacent two units of the boosting circuit units to thereby increase an input voltage.