A Rail-to-Rail Class-B Buffer With DC Level-Shifting Current Mirror and Distributed Miller Compensation for LCD Column Drivers

作者：Huang Wei Jen^*; Nagayasu Shigeisa; Liu Shen Iuan

来源：IEEE Transactions on Circuits and Systems I-Regular Papers, 2011, 58(8): 1761-1772.

DOI：10.1109/TCSI.2011.2106053

• DC level-shifting current mirror
• distributed Miller compensation
• high-quality display panel applications
• liquid crystal display (LCD) column drivers
• rail-to-rail class-B buffer

A rail-to-rail class-B buffer with a dc level-shifting current mirror and the proposed distributed Miller compensation is presented for liquid crystal display (LCD) column drivers. By using a dc level-shifting current mirror, the rail-to-rail input stage directly turns on/off the rail-to-rail push-pull output stage without extra comparators. It results in a low-power rail-to-rail class-B buffer. By utilizing the distributed Miller compensation, this class-B buffer achieves the high stability and the fast transient response over a wide-range capacitance load. The class-B buffer is fabricated in a 0.35 mu m CMOS process, and its die area is 122 mu m x 54 mu m. From the experimental results, the measured quiescent current is 3 mu A and the settling time for a rail-to-rail full swing to settle within 0.2% of the final voltage for both rising and falling edges is 1.78 mu s under a load capacitance of 1200 pF with a power supply of 3.3 V.

• 出版日期2011-8
• 单位中国科学院电工研究所