一种具有输出限压功能的电荷泵的设计

• 作 者: 范建功 冯全源
• 机 构: 西南交通大学微电子研究所,
• 出 处: 微电子学
• 发表日期: 2016年01期
• 关键词: USB power management system Charge pump Output control Low voltage process On re

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 traditional charge pumps, more design is often focused on the charge pump’s boost efficiency. However, in the low-voltage process, the high voltage will make the MOS tube in danger of breakdown, meanwhile, the on-resistance of the switch tube changes obviously with the supply voltage. In view of the above problems, a charge pump with output voltage limiting is proposed. 0.5μm UMC process, the use of Cadence and Hspice software circuit design and simulation. The results show that the output voltage of the charge pump can be controlled within a certain range when the power supply voltage is in the range of 2.7-5.5V, and the on-resistance of the switch tube changes little.