An area-saving and high power efficiency charge pump is proposed, and methods for optimizing the operation frequency and improving the power efficiency are discussed. Through sharing coupling capacitors the proposed c...An area-saving and high power efficiency charge pump is proposed, and methods for optimizing the operation frequency and improving the power efficiency are discussed. Through sharing coupling capacitors the proposed charge pump realizes two DC-DC functions in one circuit, which can generate both positive and negative high voltages. Due to sharing of the coupling capacitors, as compared with a previous charge pump designed by us for a TFT-LCD driver IC, the die area and the amounts of necessary external capacitors are reduced by 40% and 33%, respectively. Furthermore, the charge pump＇s power efficiency is improved by 8% as a result of employing the new topology. The designed circuit has been successfully applied in a one-chip TFT-LCD driver IC implemented in a 0.18 μm low/mid/high mixed-voltage CMOS process.展开更多
论述了在uC linux中基于F ram ebu ffer的LCD驱动程序的实现方法,主要介绍F ram ebu ffer的处理机制以及底层驱动的接口函数,针对具体的LCD面板,如何在uC linux中编写帧缓冲设备的驱动程序.另外,在F ram ebu ffer的基础上,简要介绍了嵌...论述了在uC linux中基于F ram ebu ffer的LCD驱动程序的实现方法,主要介绍F ram ebu ffer的处理机制以及底层驱动的接口函数,针对具体的LCD面板,如何在uC linux中编写帧缓冲设备的驱动程序.另外,在F ram ebu ffer的基础上,简要介绍了嵌入式GU I(M icrow indow s).硬件平台采用现今最流行的嵌入式处理器(ARM),操作系统为uC linux.展开更多
基金Project supported by the National High Technology Research and Development Program of China (No.2005AA1Z1193)
文摘An area-saving and high power efficiency charge pump is proposed, and methods for optimizing the operation frequency and improving the power efficiency are discussed. Through sharing coupling capacitors the proposed charge pump realizes two DC-DC functions in one circuit, which can generate both positive and negative high voltages. Due to sharing of the coupling capacitors, as compared with a previous charge pump designed by us for a TFT-LCD driver IC, the die area and the amounts of necessary external capacitors are reduced by 40% and 33%, respectively. Furthermore, the charge pump＇s power efficiency is improved by 8% as a result of employing the new topology. The designed circuit has been successfully applied in a one-chip TFT-LCD driver IC implemented in a 0.18 μm low/mid/high mixed-voltage CMOS process.
