Patent ID: 8421524

Claim:
A charge pump system comprising: a charge pump, the charge pump including: a first stage having first and second legs, the first leg having: a first capacitor connected between a first internal node and a first clock signal; a first transistor connected between the first internal node and the first stage's input voltage; and a first switch, whereby a first output node is connected to ground when a third clock signal is asserted and connected to the first internal node when the third clock signal is de-asserted; and the second leg having; a second capacitor connected between a second internal node and a second clock signal; a second transistor connected between the second internal node and the first stage's input voltage; and a second switch, whereby a second output node is connected to ground when a fourth clock signal is asserted and connected to the second internal node when the fourth clock signal is de-asserted, wherein the gate of the first transistor is connected to the second internal node and the gate of the second transistor is connected to the first internal node; a first load capacitance connected between the first output node and ground; and a second load capacitance connected between the second output node and ground; and clock generating circuitry that provides the first, second, third and fourth clock signal, wherein the first and second clock signal are non-overlapping such that when the first clock signal is high the second clock signal is low, and when the second clock signal is high the first clock signal is low, wherein the third clock signal is de-asserted while the second clock signal is high and reasserted before the second clock signal goes high, and wherein the fourth clock signal is de-asserted while the first clock signal is high and reasserted before the first clock signal goes high.