A novel class of complementary folded-cascode opamps for low voltage

Author

Roewer, Falk ; Kleine, Ulrich

Author_Institution

FEIT-IESK, Otto-von-Guericke Univ. Magdeburg, Germany

Volume

37

Issue

8

fYear

2002

fDate

8/1/2002 12:00:00 AM

Firstpage

1080

Lastpage

1083

Abstract

Three novel complementary folded-cascode operational amplifiers (opamps) with high gain, large bandwidth, and rail-to-rail input range for low-voltage operation will be presented. These opamps feature high bandwidth due to minimum internal nodes. The output swing is increased by properly adjusting the output cascode transistor gate voltages close to the power supply voltages. The opamps have been fabricated with a standard 0.8-μm CMOS technology. Measurements show the amplification is between 60.1 and 72.4 dB, and the unity gain bandwidth is 14 MHz for a 5-pF load, 2.5-V power supply, and 150-μA bias current.

Keywords

CMOS analogue integrated circuits; current mirrors; low-power electronics; operational amplifiers; 14 MHz; 2.5 V; 5 pF; active loads; class-AB cascode output stage; complementary current mirrors; complementary differential input pairs; complementary folded-cascode op amp; high gain; large bandwidth; low-voltage operation; minimum internal nodes; output cascode transistor gate voltages; rail-to-rail input range; standard CMOS technology; Bandwidth; CMOS technology; Current measurement; Gain measurement; Low voltage; Operational amplifiers; Power measurement; Power supplies; Rail to rail amplifiers; Rail to rail inputs;

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/JSSC.2002.800949

Filename

1020248