Title :
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
fDate :
6/23/1905 12:00:00 AM
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;
Conference_Titel :
Electronics, Circuits and Systems, 2001. ICECS 2001. The 8th IEEE International Conference on
Print_ISBN :
0-7803-7057-0
DOI :
10.1109/ICECS.2001.957635
