Patent ID: 7208996

Claim:
A charge pump circuit comprising: a first switching element for charge transfer and a second switching element for charge transfer that are connected in series; a first capacitor comprising a first terminal and a second terminal, the first terminal of the first capacitor being connected to a connecting point between the first switching element for charge transfer and the second switching element for charge transfer; a third switching element for charge transfer and a fourth switching element for charge transfer that are connected in series; a second capacitor comprising a first terminal and a second terminal, the first terminal of the second capacitor being connected to a connecting point between the third switching element for charge transfer and the fourth switching element for charge transfer; a clock driver for a pair of complementary clocks that alternate between a first voltage level and a second voltage level, the clock driver providing the second terminal of the first capacitor with one of the complementary clocks and providing the second terminal of the second capacitor with another of the complementary clocks; an input terminal connected to the first switching element for charge transfer and the third switching elements for charge transfer; a power supply providing the input terminal with an input voltage; and a control circuit that turns on the second switching element and the third switching element after changing corresponding voltage levels of the complementary clocks while the first switching element, the second switching element, the third switching element and the fourth switching element are turned off, and turns on the first switching element and the fourth switching element after changing corresponding voltage levels of the complementary clocks while the first switching element, the second switching element, the third switching element and the fourth switching element are turned off.