Class-AB large-swing CMOS buffer amplifier with controlled bias current

A class-AB large swing CMOS buffer amplifier with new error amplifier circuits is presented. The error amplifier accurately controls the quiescent current through the output transistors, thereby reducing the variation of the quiescent power dissipation due to process and temperature variations. The buffer amplifier fabricated using 1.2- mu m CMOS technology occupies an area of 103 mil/sup 2/ and dissipates an average of 4.7 mW under the quiescent condition with the standard deviation of only 3.2% of the average value. It has -63.6 dB THD with 3.5 V/sub pp/ output swing into a 300 Omega /150 pF load at 5 kHz. >

[1]  R. Koch,et al.  A Class AB High Swing CMOS Power Amplifier , 1991, ESSCIRC '91: Proceedings - Seventeenth European Solid-State Circuits Conference.

[2]  K. Nagaraj.  Large-swing CMOS buffer amplifier , 1989 .

[3]  P.R. Gray,et al.  A programmable CMOS dual channel interface processor for telecommunications applications , 1984, IEEE Journal of Solid-State Circuits.

[4]  J.A. Fisher.  A high-performance CMOS power amplifier , 1985, IEEE Journal of Solid-State Circuits.

[5]  K. E. Brehmer,et al.  Large swing CMOS power amplifier , 1983 .