一种避免串通电流产生的交叉耦合电荷泵设计

Design of cross-couple charge pump to avoid shoot-through current

针对传统电荷泵的串通现象,提出了一种采用非交叠时钟控制的输入范围宽、输出纹波小、能有效避免串通现象产生的高压交叉耦合电荷泵,从而提高电压增益和效益;同时,设计出一种具有负反馈调节能力,可以跟随输入电压调节的移位电平产生电路,输出纹波约15mV,具有较高的抗干扰能力.基于0.35μm BCD(bipolar CMOS DMOS)工艺进行电路设计,Spectre仿真结果表明:该电路的工作电压范围为4~24V,可驱动1mA的负载电流,最大升压效率高达99.89%,并且电压增益可以调节.

In view of the problems of traditional charge pump shoot-through phenomenon,a high-voltage cross-couple charge pump with non-overlapping clock was proposed.This charge pump has a wide input range and a small output ripple,and can effectively avoid the shoot-through current phenomenon,thus improve the voltage gain and efficiency.In the new pump,a level shift circuit with negative feedback regulation ability was designed,which can follow input voltage,output ripple about 15 mV and has high anti-interference ability.Based on the 0.35μm BCD（bipolar CMOS DMOS）process,the Spectre simulation results show that the proposed charge pump can operate with a supply voltage from 4Vto 24 Vand drive a maximum output current of about 1mA.The maximum boost efficiency is up to 99.89% when the circuit is in a high voltage input,and the voltage gain can be adjusted.