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 m 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 s. The chip area of new structure DAC is 1/8 of the traditional structure DAC

and can achieve the 10 billion colors (2

10

2

10

2

10

) display.