一种高性能低压电荷泵电路

Circuit design of low voltage charge pump with high performance

提出了一种高性能低压电荷泵电路.该电路基于Dickson电荷泵,用二极管连接的npn三极管(bc结连接)替代NMOS管.三极管be结的结电压稳定,且漏电流(Ise)小,故电荷泵电荷转移效率高.在3.3V的工作电压下,实现了11.5V的高输出电压,而且时钟频率低(1MHz).通过分析和仿真,采用二极管连接的三极管电荷泵性能优秀,具有很强的实用性.

A circuit for low voltage charge pump with high performance was designed which consisted of Dickson charge pump and diode-connected npn （as a pumping stage） mainly. Because of the stabili- ty of voltage and the lower Isc on be junction, the efficiency of charge transferring was improved largely. Under operation voltage of 3.3 V, output driver voltage of 11.5 V was supplied by the charge pump and the clock frequency was lower （1 MHz）. The simulation results show that the proposed charge pump circuit works excellently.