Patent ID: 7397299
Filing Date: 2008-07-08
Classification: H02M

Abstract:
1. A charge pump comprising a plurality of charging stages, wherein each of said charging stage comprising: a first input for a first input voltage, a first capacitor having a first end and a second end, a first charging switch, a first step-up switch, a first grounding switch and a first output for outputting a first output voltage from the first capacitor; and a second input for a second input voltage, a second capacitor having a first end and a second end, a second charging switch, a second step-up switch, a second grounding switch and a second output for outputting a second output voltage from the second capacitor; wherein the first charging switch is connected between the second input voltage and the second end of the first capacitor; the second charging switch is connected between the first input voltage and the second end of the second capacitor; the first step-up switch is connected between the first input voltage and the first end of the first capacitor; the second step-up switch is connected between the second input voltage and the first end of the second capacitor; the first grounding switch is connected to the first end of the first capacitor for connecting the first end of the first capacitor to a base level; and the second grounding switch is connected to the first end of the second capacitor for connecting the first end of the second capacitor to a base level; wherein the first set-up switch, the second charging switch and the second grounding switch are configured to operate responsive to a first clock signal; and wherein the first charging switch, the first grounding switch and the second set-up switch are configured to operate responsive to a second clock signal, the first and second clock signals being different clock signals.