Patent ID: 7605640

Claim:
A charge pump, comprising: a plurality of charging stages, wherein each of the charging stages includes: a first input node, 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 node configured to output a first output voltage from the first capacitor; and a second input node, a second capacitor having a third end and a fourth end, a second charging switch, a second step-up switch, a second grounding switch, and a second output node configured to output a second output voltage from the second capacitor, wherein: the first charging switch is coupled to the second input node and to the second end of the first capacitor; the second charging switch is coupled to the first input node and to the fourth end of the second capacitor; the first step-up switch is coupled to the first input node and to the first end of the first capacitor; the second step-up switch is coupled to the second input node and to the third end of the second capacitor; the first grounding switch is coupled to the first end of the first capacitor and is configured to couple the first end of the first capacitor to a base level; the second grounding switch is coupled to the third end of the second capacitor and is configured to couple the third end of the second capacitor to the base level; the first set-up switch, the second charging switch, and the second grounding switch are configured to operate responsive to a first edge of each clock pulse of a clock signal; and the first charging switch, the first grounding switch, and the second set-up switch are configured to operate responsive to a second edge of each clock pulse of the clock signal, wherein the first and second edges are different edges of each clock pulse.