DAC和驱动Buffer是TFT-LCD源驱动电路芯片中的重要模块,决定着芯片的主要性能.文章讨论了传统的R-DAC结构及其用于10-bit TFT-LCD源驱动电路时的弊端,详细阐述了新型R-DAC+ C-DAC的原理以及设计方法,并采用0.35 μm 5 V CMOS工艺设计和实现了该电路.Hspice仿真结果表明,所设计的DAC电路的DNL和INL分别小于0.4 LSB和1.5 LSB,输出电压的建立时间小于3.5μs.该新型结构DAC的面积约是传统结构面积的1/8,且能够实现10亿色(210×210×210)的全真彩显示.%DAC and drive Buffer is a key module of TFT-LCD source driver IC, which determines the main properties of the chip. Firstly, the drawbacks of traditional R-DAC structure used for 10-bit TFT-LCD source driver circuit was discussed, then the new R-DAC + C-DAC principles and design methods were described. The proposed DAC circuit was designed and realized using 0. 35 μm 5 V CMOS process. The results of Hspice simulation show that the DNL and INL of DAC circuit are less than 0. 4 LSB or 1. 5 LSB, respectively, and the output voltage settling time is less than 3. 5 μs. The chip area of new structure DAC is 1/8 of the traditional structure DAC, and can achieve the 10 billion colors (210 ×210 ×210) display.
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