一种应用于AMOLED显示驱动的电荷泵系统  

A charge pump system applied to AMOLED display drive

作　　者：宇跃峰 尹勇生[1] 谢熙明 权磊 贾晨 Yu Yuefeng;Yin Yongsheng;Xie Ximing;Quan Lei;Jia Chen(Institute of VLSI Design,IC Design Web-cooperation Research Center of MOE,Hefei University of Technology,Hefei 230601,China;Research Institute of Tsinghua University in Shenzhen,Shenzhen 518057,China)

机构地区：[1]合肥工业大学微电子设计研究所,教育部IC设计网上合作研究中心,安徽合肥230601 [2]深圳清华大学研究院,广东深圳518057

出　　处：《电子技术应用》2020年第10期51-56,共6页Application of Electronic Technique

基　　金：国家自然科学基金(61704043);中央高校基本科研业务费专项资金(JD2016JGPY0003);深圳市科创委技术攻关项目(JSGG20170413153845042)。

摘　　要：基于UMC 80 nm工艺,设计了一种应用于AMOLED显示驱动的电荷泵系统。为了满足AMOLED显示驱动在不同输出电压情况下保持电源效率高于70%的要求,本设计中泵电路采用多输入电源结构,并在不同路径上使用不同类型的MOS管。为了保障电路在8 mA负载下输出电压纹波小于10 mV,采用双边对称的泵电路结构。为了保持输出电压的稳定性,整个系统采用PSM调制方式。对电路进行Spectre仿真,在1μF泵电容以及2.2μF输出电容,负载电流为8 mA情况下,各种输出电压情况下的电压纹波最大为1.2 mV,电源效率最低为70%,峰值效率为83.6%。Based on the UMC 80 nm process, a charge pump system for AMOLED display drive is designed. In order to ensure that the output voltage ripple of the circuit is less than 10 mV under 8 mA load, this design adopts bilateral symmetric pump cir-cuit structure. In order to maintain the power efficiency above 70 % under different output voltages, the pump circuit in this design uses a multi-input power supply structure. In order to maintain the stability of the output voltage, the entire system in this design uses PSM modulation. Hspice simulation of the circuit, in the case of 1 μF pump capacitor and 2. 2 μF output capacitor, the load current is 8 mA, the output voltage ripple is 1. 2 mV and the power supply efficiency is at least 70 % under various output condi-tions, 83. 6 % peak efficiency.

关 键 词：电荷泵 电源管理 多输入电源 对称结构泵电路 

分 类 号：TN432[电子电信—微电子学与固体电子学]