Low-Voltage Class-AB CMOS Output Stage with Tunable Quiescent Current

Zhenpeng BIAN  Ruohe YAO  Fei LUO  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E93-C   No.8   pp.1375-1376
Publication Date: 2010/08/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E93.C.1375
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Electronic Circuits
Keyword: 
class AB,  low voltage,  operational amplifier,  quiescent current control,  output stage,  

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Summary: 
A low-voltage class-AB CMOS output stage with a tunable quiescent current control circuit is presented. It is based on a complementary common source. The quiescent current is detected by a compact circuit and can be adjusted by means of a control current without need to modify the transistor dimensions. The minimum supply voltage can be down to one threshold voltage plus two saturation voltages. It is suitable to drive low resistive loads. Simulation results are provided that are in agreement with expected characteristics.