Class AB output stages for low voltage CMOS opamps with accurate quiescent current control by means of dynamic biasing

Author

Torralba, A. ; Carvajal, R.G. ; Ramirez-Angulo, J. ; Tombs, J. ; Galan, J.

Author_Institution

Escuela Superior de Ingenieros, Seville Univ., Spain

Volume

2

fYear

2001

fDate

6/23/1905 12:00:00 AM

Firstpage

967

Abstract

Two new class AB output stages for CMOS op-amps are proposed with accurate quiescent current control. The second proposed stage also provides accurate control of the minimum current through the output transistors. The proposed stages can be operated with a supply voltage close to a transistor threshold voltage. A dynamic biasing scheme allows them to operate in a wide range of supply voltages. Simulation and experimental results are provided that are in good agreement with expected values

Keywords

CMOS analogue integrated circuits; circuit simulation; electric current control; integrated circuit design; integrated circuit measurement; integrated circuit modelling; low-power electronics; operational amplifiers; class AB output stages; dynamic biasing; dynamic biasing scheme; low voltage CMOS op-amps; minimum current control; output transistors; quiescent current control; simulation; supply voltage; transistor threshold voltage; Circuit simulation; Current control; Differential amplifiers; Electric current control; Electronic equipment; Electronics industry; Feedback loop; Low voltage; Resistors; Threshold voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Electronics, Circuits and Systems, 2001. ICECS 2001. The 8th IEEE International Conference on

Print_ISBN

0-7803-7057-0

Type

conf

DOI

10.1109/ICECS.2001.957635

Filename

957635