一种具有输出限压功能的电荷泵的设计

Design of a Charge Pump Circuit with Output Control

在传统的电荷泵中,通常将更多的设计重点放在电荷泵的升压效率问题上。但是,在低电压工艺中,过高的电压会让MOS管处于被击穿的危险之中,同时,开关管的导通电阻随电源电压的变化很明显。针对上述问题,提出了一种具有输出限压功能的电荷泵。采用0.5μm UMC工艺,利用Cadence和Hspice软件进行电路设计与仿真。结果表明,当电源电压在2.7~5.5V范围内变化时,电荷泵的输出电压可控制在一定范围内,并且开关管的导通电阻变化很小。

In tradition designs of charge pump,the direction of more designs is paid on efficiency of the charge pump.But in low voltage process,excessive voltage will put MOS transistor in danger of being broken down,and the on-resistance of switch transistor will change obviously with power supply voltage.Aiming at the above problems,a charge pump circuit with output control was proposed.The charge pump was designed and simulated based on 0.5μm UMC technology library with the Cadence and Hspice software.Simulation results showed that when the power supply changed in the range of 2.7-5.5 V,the output voltage of charge pump was controlled in certain range,and the on-resistance of switch transistor changed little.