Title :
A low voltage class AB CMOS amplifier
Author :
Wang, Feng ; Heineke, Randy ; Harjani, Ramesh
Author_Institution :
Dept. of Electr. Eng., Minnesota Univ., Minneapolis, MN, USA
Abstract :
A new class AB CMOS operational amplifier (opamp) principle is presented. It is based on a novel self-biasing input transistor technique. The operational transconductance amplifier (OTA) utilizing this principle exhibits similar small signal characteristics of conventional OTAs. It has, however, a superior large signal behavior and its settling time is not slew-rate limited. It also overcomes the difficulties of unconditional stability inherent in some class AB opamps. It is particularly suited for low voltage operation. Due to the generality of the proposed technique, the principle can be applied to many other circuit topologies
Keywords :
CMOS analogue integrated circuits; operational amplifiers; circuit topology; large signal characteristics; low voltage class AB CMOS amplifier; operational transconductance amplifier; self-biasing input transistor; settling time; slew rate; small signal characteristics; stability; Circuit stability; Circuit topology; Current measurement; Feedback circuits; Low voltage; Mirrors; Negative feedback loops; Operational amplifiers; Output feedback; Tail;
Conference_Titel :
Circuits and Systems, 1996. ISCAS '96., Connecting the World., 1996 IEEE International Symposium on
Conference_Location :
Atlanta, GA
Print_ISBN :
0-7803-3073-0
DOI :
10.1109/ISCAS.1996.539967
