Patent ID: 7508253

Claim:
A charge pump device comprising: an input node connected to a voltage source; an output node for providing an output voltage; a clock control unit for providing a first clock signal and a second clock signal that are mutually opposite in phase; at least two cascaded stages of charge transfer units each comprising a first node, a second node, a first circuit connected between said first and second nodes, a first capacitor, said first capacitor being connected to said second node and said clock control unit, said first node of the first stage of said charge transfer units being connected to said input node, said first node and said second node of another stage of said charge transfer units being connected to said second node and said first circuit of the previous stage of said charge transfer units, respectively; and an output unit comprising a third node, a second circuit and a second capacitor connected to said clock control unit, said third node being connected to said second node of the last stage of said charge transfer units, said second circuit being connected to said third node, said output node, said second capacitor, and said first circuit of the last stage of said charge transfer units; wherein said first circuit comprises a fourth node, a fifth node, a first transistor a second transistor, a third transistor and a fourth transistor, substrates of said first transistor, said second transistor and said third transistor are connected to said first node, said fifth node is connected to the substrate of said fourth transistor and said second node of the next stage of said charge transfer units, said second circuit comprises a sixth nodes a seventh node, a fifth transistor a sixth transistor a seventh transistor and an eighth transistor, substrates of said fifth transistor, said sixth transistor and said seventh transistor are connected to said seventh node, the substrate of said eighth transistor is connected to said output nodes said sixth node is connected to said eighth transistor, said second capacitor and said fifth node of the last stage of said charge transfer units.