Patent ID: 7511562

Claim:
A high voltage generating circuit, comprising: a first pump circuit precharging a first boost node to a power supply voltage in response to a first precharge signal, and boosting the first boost node in response to a first pump signal; a second pump circuit precharging a second boost node to the power supply voltage in response to the first precharge signal, boosting the second boost node in response to the first pump signal, precharging a third boost node in response to a second precharge signal, and boosting the third boost node in response to a second pump signal; a third pump circuit selectively precharging a fourth boost node in response to a precharge control signal and boosting the fourth boost node in response to a third pump signal; a first switch connecting the second boost node to the third boost node in response to a first switch signal; a second switch connecting the first boost node to the fourth boost node in response to the first switch signal; a third switch connecting the third boost node to the fourth boost node in response to a second switch signal; and a fourth switch connecting the fourth boost node to an output terminal in response to a third switch signal, thereby providing high voltage at the output terminal.