A Class AB High Swing CMOS Power Amplifier

A novel CMOS power amplifier is presented. The following often contradictory requirements are fullfilled: - low and stable quiescent current - significantly (160 times) larger peak current - low crossover distortion - high output swing (3.2Vpp) together with - high driving capability (25 Ohm load) from a - single 5V power supply - minimum chip area These features have been achieved by combining the known AB output stage with new high swing error amplifiers and a tracking source follower stage for low output voltages. The novel power amplifier is implemented in the ARCOFIR which is part of a subscriber telephone chip set.

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

[2]  J. Fisher,et al.  A Highly Linear CMOS Buffer Amplifier , 1987, ESSCIRC '86: Twelfth European Solid-State Circuits Conference.

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

[4]  D. Monticelli.  A quad CMOS single-supply op amp with rail-to-rail output swing , 1986 .

[5]  A. Gola,et al.  A Low-Voltage High-Drive Differential Amplifier For ISDN Applications , 1988, ESSCIRC '88: Fourteenth European Solid-State Circuits Conference.

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