Patent ID: 7948301

Claim:
A charge pump, comprising: a first capacitor having a first terminal and a second terminal; a first switch coupled to the first terminal of the first capacitor for coupling the first terminal to either an input terminal for receiving an input voltage or to an output node; a second switch coupled to the second terminal of the first capacitor for coupling the second terminal to either a reference voltage terminal or to the input terminal; an output capacitance having a first terminal coupled to the second terminal of the first switch and having a second terminal coupled to the reference voltage terminal, the output capacitance receiving charge from the input terminal and the first capacitor; a second capacitor having a first terminal and a second terminal, the second terminal being coupled to the reference voltage terminal; and a third switch coupled to the first terminal of the second capacitor for selectively coupling the first terminal of the second capacitor to either the first terminal of the output capacitance or the input terminal, the second capacitor selectively removing charge from the output capacitance using the third switch and coupling said charge to the input terminal as feedback.