摘要
引入了一种应用于TFT-LCD驱动芯片的内置正负倍压电荷泵结构。在对其动作原理进行分析的基础上,对该电荷泵进行了时钟频率及开关网络中开关尺寸的优化并得到了最优的升压效率及功率效率。基于0.18μm高/中/低混合电压CMOS工艺的仿真结果表明,该优化方案是行之有效的:电路工作在最优时钟频率f=15kHz时,可以使升压效率达到最大值(2mA负载,升压效率最高达到86.7%);而开关网络采用最优的开关尺寸设置,可以使电荷泵的功率效率达到最高(2mA负载,f=15kHz,功率效率经优化后达到83.6%)。该电荷泵电路已被成功应用于一款TFT-LCD驱动芯片中。
A built-in step-up and inverse charge pump for TFT-LCD driver is introduced. Based on the analysis of the charge pump, methods of optimization for the operation frequency and switeh＇s size are proposed, as a result of which, the DC-DC conversion efficiency and power efficiency are improved. The charge pump has been simulated with a 0.18 ~m high voltage mixed-voltage CMOS process. The optimization methods is proved to be effective by the simulation result. The DC-DC conversion efficiency of the charge pump can reach its best value （86.7% with load of 2 mA） at the optimized operation frequency of f=15 kHz. And the power efficiency is highest （83.6%with load of 2 mA, f= 15 kHz） when the switches are employed with optimal size. The charge pump has been successfully applied to a TFT-LCD driver IC.
出处
《液晶与显示》
CAS
CSCD
北大核心
2009年第2期221-227,共7页
Chinese Journal of Liquid Crystals and Displays
基金
国家"863"计划资助项目(No.2005AA1Z1193)
西北工业大学研究生创业种子基金(No.200861)
