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

Volume

3

fYear

2002

fDate

2002

Firstpage

607

Lastpage

610

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2002. ISCAS 2002. IEEE International Symposium on

Conference_Location

Phoenix-Scottsdale, AZ

Print_ISBN

0-7803-7448-7

Type

conf

DOI

10.1109/ISCAS.2002.1010297

Filename

1010297