The charge pump is designed for LCD-driver used in mobile telephone.By estimation of the rise time of the Fibonacci-like charge pump

an optimal switching frequency is suggested to make a compromise between the rise time and the dynamic power dissipation.The simulating comparison results based on 1.2μm CMOS technology parameters show that the charge pump has a high pumping speed and a high power efficiency.By some techniques

a novel charge pump is proposed which can operate in versatile portable equipments supplied by 1.2V~5V.One is to improve the V

GS

voltage potential

the second is to connect substrates always to highest voltage by sets of two transistors.