Patent ID: 8279012
Filing Date: 2012-10-02
Classification: H02M,H03F,H03G

Abstract:
1. A charge pump circuit comprising: an input node for receiving an input voltage; a common node; first and second output nodes for outputting first and second output voltages, respectively; a plurality of flying capacitor nodes; a network of switches for interconnecting said input node, said first and second output nodes and said plurality of flying capacitor nodes; and a controller for operating said switches, said controller being operable, in use with a first reservoir capacitor connected between said first output node and said common node, with a second reservoir capacitor connected between said second output node and said common node, and additionally with only a single flying capacitor connected to said flying capacitor nodes, in a first mode to operate said switches in a sequence of states so as to generate said first and second output voltages at said first and second output nodes, respectively, wherein said first and second output voltages are of opposite polarity to one another and each is substantially equal in magnitude to half of said input voltage.