Due to the large number of output buffers on a column driver chip of a flat-panel display, the quiescent current and die area of the output buffer must be minimized. This paper presents a low static power, large output swing, and wide operating voltage range class-B output buffer amplifier for driving the large column line capacitance in a flat-panel display. A comparator is used in the negative feedback path to eliminate quiescent current in the output stage. The proposed output buffer circuit was implemented in a 0.8 /spl mu/m CMOS process. Its output voltage swing is from 1 V to the supply voltage. With 5 V supply and 600 pF load, the maximum tracking error is /spl plusmn/7 mV. The measured static current is 24 /spl mu/A. The settling time for 4 V swing to within 0.2% is 8 /spl mu/s, which is more than adequate for driving 1280/spl times/1024 pixels liquid crystal displays with 86 Hz frame rate and 256 gray levels in each color.
[1]
Chi-Chang Wang,et al.
Data line driver design for A 10" 480/spl times/640/spl times/3 color FED
,
1996,
9th International Vacuum Microelectronics Conference.
[2]
H. Khorramabadi.
A CMOS line driver with 80-dB linearity for ISDN applications
,
1992
.
[3]
Tsutomu Wada,et al.
Multimedia projector using 720 × 480 pixel a-Si TFT-LCDs and a high-speed analogue driver LSI
,
1992
.
[4]
H. Khorramabadi.
A CMOS Line Driver With 80DB Linearity For ISDN Applications
,
1991,
1991 Symposium on VLSI Circuits.
[5]
Bing J. Sheu,et al.
A high-speed CMOS amplifier with dynamic frequency compensation
,
1990,
IEEE Proceedings of the Custom Integrated Circuits Conference.
[6]
Randall L. Geiger,et al.
VLSI Design Techniques for Analog and Digital Circuits
,
1989
.