Patent ID: 6736474
Filing Date: 2004-05-18
Classification: H02M

Abstract:
A charge pump circuit, comprising:a first capacitor having an input coupled to a first signal; a second capacitor having an input coupled to a second signal, wherein the second capacitor is sufficiently large to efficiently divide the second signal voltage; a first diode having an anode coupled to an output of the first capacitor and a cathode coupled to an output of the second capacitor; a second diode having an anode coupled to the output of the second capacitor and a cathode coupled to the output of the first capacitor, wherein the second diode has a minimum channel length; and a controllable switch having a control input coupled to the output of the second capacitor and connecting the output of the first capacitor to an output of the charge pump circuit, wherein the controllable switch has a channel length greater than a minimum channel length.