Patent ID: 6943615

Claim:
An integrated charge pump voltage booster for boosting the voltage of a digital input signal, comprising: an input node for receiving the digital input signal; a supply node; a first switch connected to the supply node; a first capacitor having a first terminal coupled to the supply node via a first switch, and having a second terminal: a second switch; an output node connected to the first terminal through the second switch; a third switch connected to a reference potential; a capacitive load connected to the output node and to the third switch; control means for closing said first and third switches, for opening said second switch and for grounding the second terminal of said first capacitor at the end of a second phase of the digital input signal and for opening said third switch and closing said second switch at the end of a first phase of the digital input signal, so that when a voltage on the output node increases enough to open said first switch, said second terminal of the first capacitor is coupled to the supply node the first and second switches comprising PMOS transistors each having biasing means for biasing their respective body regions at a voltage not lower than their respective source and drain voltages; said third switch comprising an NMOS transistor; said control means comprising a logic NOR gate having a first input driven together with a common control node of said second switch and of said third switch by the digital input signal received on the input node, a second inverting input coupled in common with the gate of said first switch and said output node, and an output connected to said second terminal of the first capacitor.