Low voltage rail-to-rail operational amplifier based on flipped voltage followers

Author

Padilla, Ivan ; Ramirez-Angulo, Jaime ; Carvajal, Ramon G. ; Lopez-Martin, Antonio

Author_Institution

Klipsch Sch. of Electr. & Comput. Eng., New Mexico State Univ., Las Cruces, NM, USA

fYear

2005

fDate

7-10 Aug. 2005

Firstpage

267

Abstract

A low voltage differential pair or flipped differential pair is presented. The design of a rail to rail op-amp with an input stage using complementary flipped differential pairs and a novel gm control circuit is discussed. Simulation results in 0.5μm CMOS technology with nominal PMOS and NMOS threshold voltages of 0.75V and -0.95V show input/output rail-to-rail operation with a 1.9V single supply. This supply is two drain-source saturation voltages lower than for rail op amp using conventional complementary differential pairs.

Keywords

CMOS analogue integrated circuits; differential amplifiers; low-power electronics; operational amplifiers; -0.95 V; 0.5 micron; 0.75 V; 1.9 V; CMOS technology; NMOS threshold voltage; PMOS threshold voltage; complementary flipped differential pairs; flipped voltage followers; rail-to-rail operational amplifier; CMOS technology; Circuits; Low voltage; MOS devices; Operational amplifiers; Rail to rail amplifiers; Rail to rail inputs; Rail to rail operation; Threshold voltage; Transconductance;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2005. 48th Midwest Symposium on

Print_ISBN

0-7803-9197-7

Type

conf

DOI

10.1109/MWSCAS.2005.1594090

Filename

1594090