Patent ID: 7342438

Claim:
A negative charge pump comprising: a first boot capacitor having a first terminal coupled to receive a first clock signal; a first pump capacitor having a first terminal coupled to receive a second clock signal; a triple-well n-channel pass gate transistor having a deep n-well and a p-type substrate coupled with ground, a gate coupled to a second terminal of the first boot capacitor, a source coupled with a second terminal of the first pump capacitor and a drain coupled to receive an input potential; a first n-type transistor having a source coupled with a p-well region of the pass gate transistor, a drain coupled with the second terminal of the first pump capacitor and a gate coupled to receive the input potential; and a second n-type transistor having a source coupled with the p-well region of the pass gate transistor, a drain coupled to receive the input potential and a gate coupled to the second terminal of the first pump capacitor.