Rail-to-rail super class AB CMOS operational amplifiers

Author

Baswa, S. ; Ramirez-Angulo, J. ; López-Martín, A.J. ; Carvajal, R.G. ; Bikumandla, M.

Author_Institution

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

Volume

41

Issue

1

fYear

2005

Firstpage

1

Lastpage

2

Abstract

Novel class AB single-stage operational amplifiers are presented. They feature rail-to-rail operation owing to the use of floating-gate input transistors. Initial charge of the floating gates is removed during fabrication, without any post-processing. The amplifiers are fast, simple, and able to operate at low supply voltages. They are highly power efficient owing to the enhanced (super) class AB operation based on adaptive biasing and local common-mode feedback. A 0.5 μm CMOS implementation shows rail-to-rail operation with slew rates of about 40 V/μs for a load of 80 pF and 144 μW of quiescent power consumption.

Keywords

CMOS analogue integrated circuits; feedback amplifiers; integrated circuit design; operational amplifiers; power amplifiers; 0.5 micron; 144 muW; 80 pF; adaptive biasing; enhanced super class AB operation; floating-gate input transistors; highly power efficient amplifier; local common-mode feedback; low supply voltages; novel class AB single-stage operational amplifiers; quiescent power consumption; rail-rail super class AB CMOS operational amplifiers; slew rates;

fLanguage

English

Journal_Title

Electronics Letters

Publisher

iet

ISSN

0013-5194

Type

jour

DOI

10.1049/el:20056711

Filename

1387762