Patent ID: 7382178

Claim:
A charge pump comprising: an inverter electrically coupled to a V DD signal line and a V SS signal line, an input of the inverter electrically coupled to an alternating signal line, and an output of the inverter electrically coupled to a pump capacitor; the pump capacitor electrically coupled to a source of a first PMOS transistor and a source of a second PMOS transistor; the first PMOS transistor, a drain of the first PMOS transistor electrically coupled to the V SS signal line and a drain of the inverter, a gate of the first PMOS transistor electrically coupled to the alternating signal line, a gate of a third PMOS transistor, and a source of a fourth PMOS transistor, and a substrate of the first PMOS transistor electrically coupled to a node; the second PMOS transistor, a drain of the second PMOS transistor electrically coupled to a negative voltage line, a gate of the second PMOS transistor electrically coupled to a complement of the alternating signal line, a gate of the fourth PMOS transistor, and a source of the third PMOS transistor, and a substrate of the second PMOS transistor electrically coupled to the node; the third PMOS transistor, a drain of the third PMOS transistor and a substrate of the third PMOS transistor electrically coupled to the node; and the fourth PMOS transistor, a drain of the fourth PMOS transistor and a substrate of the fourth PMOS transistor electrically coupled to the node.