Patent ID: 6603673
Filing Date: 2003-08-05
Classification: H02M

Abstract:
A charge pumping circuit provided with a booster circuit for boosting and comprising a first capacitor and a second capacitor each with a terminal thereof connected to a power source, charging operation is performed intermittently from said power source to the first capacitor, an electric charge charged on said first capacitor being shifted to said second capacitor via reverse-blocking means to carry out boosting of supply voltage, said charge pumping circuit further comprising:a constant voltage generation circuit for generating reference voltage maintained at a level lower by a fixed voltage than said supply voltage; and said booster circuit intermittently performs charging operation of said first capacitor by periodically changing potential of the other terminal for said first capacitor between said supply voltage level and said reference voltage level, and electric charge charged on the first capacitor is shifted to said second capacitor via said reverse-blocking means by changing potential of the other terminal of said second capacitor to anti-phase with respect to said first capacitor between said supply voltage level and said reference voltage level.