关键词: 缓冲器, 翻转电压跟随器, 建立时间, AB类

Abstract: A class AB buffer amplifier based on differential flipped voltage follower (DFVF) is proposed to solve the problems of long setup time and large power consumption of traditional voltage buffer. The circuit consists of a DFVF as the input stage and an output stage based on an inverter. Compared with other buffers, the circuit has simple structure and fewer transistors. Due to the use of class AB buffer, the output current is not affected by the bias current and the static current is small. The circuit is simulated in a SMIC 0.18 μm process. The simulation results show that under 1.8 V supply voltage and full voltage swing, 1 nF capacitive load can be driven in the setup time of 0.56 μs, and the static current is only 5 μA, which can be used for column driver of liquid crystal display.

Key words: buffer, flippedvoltagefollower, setuptime, classAB