Patent ID: 8427851

Claim:
A charge pump circuit comprising: an input terminal for receiving an input voltage; first and second output terminals; first and second pairs of flying capacitor terminals for connection to first and second flying capacitors respectively; and a switch network for interconnecting said input terminal, said first and second pairs of flying capacitor terminals, and said first and second output terminals in a plurality of states to generate either a first positive output voltage and a first negative output voltage that are each substantially equal in magnitude to the magnitude of said input voltage or a second positive output voltage and a second negative output voltage that are each substantially equal in magnitude to half the magnitude of said input voltage, wherein said switch network interconnects said first and second pairs of flying capacitor terminals, such that, in one of the plurality of states, the first and second flying capacitor are connected in parallel while said first and second pairs of flying capacitor terminals are disconnected from said input terminal and said first and second output terminals.