一种消除阈值电压影响的高效率电荷泵

High Efficiency Charge Pump Without Threshold-Voltage Drop

提出了一种基于Dickson电荷泵结构的片上升压电路,由两相非交叠时钟驱动,并与电平转换单元配合使用。该电路将最后一级的传输管NMOS管替换为PMOS管,再由电平转换单元产生的电压来控制该PMOS管的栅端电压,使之在导通时彻底打开,从而消除该级的阈值电压损失,提高了输出电压。

A high-efficiency charge pump based on Dickson charge pump was proposed, which was driven by a non-overlapping clock and used with level shifter. In this circuit, NMOS transistor used as transfer unit in the last stage was substituted with PMOS transistor. The gate of the PMOS was driven by a voltage generated by a level shifter, which eliminated the threshold-voltage drop, and significantly increased output voltage of the charge pump.