Title :
Common-mode response shaping in rail-to-rail op-amp input stages
Author :
Carrillo, J.M. ; Duque-Carrillo, J.F. ; Ausin, J.L. ; Valverde, J.M. ; Torelli, G.
Author_Institution :
Dept. of Electron. & Electr. Eng., Univ. de Extremadura, Badajoz, Spain
Abstract :
Low-voltage rail-to-rail (r-t-r) operational amplifiers (op-amps) suffer from large deviations in their small-signal and large signal behaviors, as a function of the input common-mode (CM) voltage. This paper introduces the concept of the CM response shaping as an effective technique for maintaining roughly constant op-amp behaviors over the full input range. This is achieved by means of two input variable floating voltage sources. Experimental results obtained from a 0.8-μm standard CMOS 3-V input/output r-t-r op-amp are shown
Keywords :
CMOS analogue integrated circuits; low-power electronics; operational amplifiers; 0.8 micron; 3 V; CMOS amplifier; LV operational amplifiers; common-mode response shaping; input common-mode voltage; low-voltage op-amps; rail-to-rail op-amp input stages; two input variable floating voltage sources; Circuits; Differential amplifiers; Input variables; Operational amplifiers; Rail to rail amplifiers; Rail to rail inputs; Rail to rail operation; Rail to rail outputs; Transconductance; Voltage;
Conference_Titel :
Circuits and Systems, 2002. ISCAS 2002. IEEE International Symposium on
Conference_Location :
Phoenix-Scottsdale, AZ
Print_ISBN :
0-7803-7448-7
DOI :
10.1109/ISCAS.2002.1010297
