Frequency and Switch Optimization for Built-in Charge Pump of TFT-LCD Driver IC

ZHENG Ran; WEI Ting-cun; WANG Jia; GAO De-yuan

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Frequency and Switch Optimization for Built-in Charge Pump of TFT-LCD Driver IC

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- Frequency and Switch Optimization for Built-in Charge Pump of TFT-LCD Driver IC
- Chinese Journal of Liquid Crystals and Displays Vol. 24, Issue 2, Pages: 221-227(2009)
- 作者机构：
  
  西北工业大学教育部嵌入式系统集成工程研究中心, 陕西西安 710065,E-mail:zhengran@nwpu.edu.cn
- 作者简介：
- 基金信息：
- DOI：
  CLC： TN27;TN702.2
- Received：13 February 2009，
  
  Revised：02 January 1900，
  
  Published Online：30 April 2009，
  
  Published：30 April 2009
- 稿件说明：
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郑然;魏廷存;王佳;高德远. TFT-LCD驱动芯片内置电荷泵频率及开关网络优化[J]. 液晶与显示, 2009,24(2): 221-227

ZHENG Ran;WEI Ting-cun;WANG Jia;GAO De-yuan. Frequency and Switch Optimization for Built-in Charge Pump of TFT-LCD Driver IC[J]. 液晶与显示, 2009,24(2): 221-227
郑然;魏廷存;王佳;高德远. TFT-LCD驱动芯片内置电荷泵频率及开关网络优化[J]. 液晶与显示, 2009,24(2): 221-227 DOI：

ZHENG Ran;WEI Ting-cun;WANG Jia;GAO De-yuan. Frequency and Switch Optimization for Built-in Charge Pump of TFT-LCD Driver IC[J]. 液晶与显示, 2009,24(2): 221-227 DOI：

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0.18 m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

=15 kHz时

可以使升压效率达到最大值(2 mA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(2 mA负载

=15 kHz

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。

Abstract

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 switch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

=15 kHz. And the power efficiency is highest (83.6% with load of 2 mA

=15 kHz) when the switches are employed with optimal size. The charge pump has been successfully applied to a TFT-LCD driver IC.

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references

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