Patent ID: 7511561
Filing Date: 2009-03-31
Classification: H02M

Abstract:
1. A boosting circuit boosting a first potential to a second potential, the boosting circuit comprising: a differential amplifier to which the first potential is inputted, and which outputs a potential corresponding to a change in the second potential; a boosting capacitor alternately repeating a charging period and a discharging period; a first switching element connected between a first reference potential, which is higher than the first potential, and one end of the boosting capacitor, and turning on in the charging period of the boosting capacitor; a second switching element connected between a second reference potential, which is lower than the first potential, and another end of the boosting capacitor, and turning on in the charging period of the boosting capacitor; a third transistor serving as a third switching element which is connected between the first reference potential and the other end of the boosting capacitor, and which turns on in the discharging period of the boosting capacitor; a fourth switching element connected between an output terminal of the second potential and the one end of the boosting capacitor, and turning on in the discharging period of the boosting capacitor; and a first selector selecting the second potential in the charging period of the boosting capacitor, and selecting an output potential of the differential amplifier in the discharging period of the boosting capacitor, and providing a selected potential to a control terminal of the third transistor.