High voltage recycling scheme to improve power consumption of regulated charge pumps

An ultra-low power regulated charge pump system based on charge recycling between a tank capacitor and the charge pump output load capacitor is presented. The proposed circuit is implemented using a 55 nm UMC High Voltage CMOS technology with a power supply of 1.2V. Simulation results show a maximum current reduction of about 38% compared to a conventional regulated charge pump system. Rise time until the steady state is reached is also reduced by 17%.