A Low-Voltage Charge Pump With Improved Pumping Efficiency

A charge pump with enhanced output voltage pumping gain and efficiency for low-voltage applications is proposed in this paper. Except for threshold voltage drop and body effect, another factor that limits voltage pumping efficiency is undesired charge transfer. The proposed charge pump circuit utilizes charge transfer switches to eliminate the effects of threshold voltage drop and body effect. Moreover, a complementary branch scheme is applied to reduce undesired charge transfer in order to further improve the pumping efficiency. Simulation results demonstrate better pumping performance of the proposed charge pump circuit compared with other circuits.