Patent ID: 7176742

Claim:
A bootstrapping circuit capable of sampling inputs beyond supply voltage comprising: a bootstrapped switch coupled between an input node and an output node; a first transistor having a first end coupled to a control node of the bootstrapped switch; a first capacitor having a first end coupled to a second end of the first transistor; a second transistor coupled between the first end of the first transistor and a supply node, and having a control node coupled to a first clock signal node; a third transistor coupled between the second end of the first transistor and the supply node; a charge pump having an output coupled to a control node of the third transistor; a level shifter having an output coupled to a second end of the first capacitor; a fourth transistor cross coupled with the first transistor; a fifth transistor having a second end coupled to a first end of the fourth transistor and having a control node coupled to the output of the level shifter; and a sixth transistor coupled between a first end of the fifth transistor and a common node, and having a control node coupled to the first clock signal node.