Title :
Supply-adaptive rail-to-rail CMOS OPAMP
Author :
Cheng, Xu ; Chen, Cheng ; Xu, Donglin ; Ren, Junyan ; Xu, Jun
Author_Institution :
ASIC & Syst. State Key Lab., Fudan Univ., Shanghai, China
Abstract :
A supply-adaptive rail-to-rail CMOS OPAMP is implemented with a standard 0.6-micron CMOS technology of CSMC, China. The external supply voltage ranges from 2.1V to 3.2V while stabilized internal supply voltage is 1.7V. With the internal supply adaptive to the crossing-point condition, a constant input Gm is achieved within 10% point-to-point maximum variation in the whole range of common-mode (CM) input. Rail-to-rail output stage with two folded meshes and feedback class-AB control minimizes the supply voltage down to Vgs+2V ds and the current, respectively
Keywords :
CMOS analogue integrated circuits; circuit feedback; operational amplifiers; 0.6 micron; 1.7 V; 2.1 to 3.2 V; common-mode input; constant input Gm; crossing-point condition; feedback class-AB control; folded mesh; supply-adaptive rail-to-rail CMOS opamp; Application specific integrated circuits; CMOS technology; Circuit testing; Equations; MOS devices; Output feedback; Rail to rail inputs; Tail; Threshold voltage; Voltage control;
Conference_Titel :
ASIC, 2001. Proceedings. 4th International Conference on
Conference_Location :
Shanghai
Print_ISBN :
0-7803-6677-8
DOI :
10.1109/ICASIC.2001.982565
