Two CMOS Current Feedback Operational Amplifiers

Author

Cataldo, Giuseppe Di ; Grasso, Alfio Dario ; Pennisi, Salvatore

Author_Institution

Catania Univ., Catania

Volume

54

Issue

11

fYear

2007

Firstpage

944

Lastpage

948

Abstract

Two internally compensated CMOS current-feedback operational amplifiers are discussed in this paper. The circuits are entirely made up of class AB stages, thereby increasing slew rate and drive capability, avoiding many of the drawbacks incurred by previous CMOS and even bipolar implementations. Experimental results on one prototype fabricated in a 0.35-mum process using a 20-pF load and supplied with 3.3 V are also given, showing, as main performance parameters, a SR of 35 V/mus and a constant closed-loop bandwidth (in inverting configuration with a 10-kOmega feedback resistor) of about 2 MHz.

Keywords

CMOS analogue integrated circuits; feedback amplifiers; operational amplifiers; CMOS current feedback operational amplifiers; bipolar implementations; class AB stages; constant closed-loop bandwidth; drive capability; feedback resistor; frequency 2 MHz; internally compensated amplifiers; inverting configuration; resistance 10 kohm; size 0.35 mum; slew rate; voltage 3.3 V; Amplifiers; CMOS; current-feedback operational amplifiers (CFOAs);

fLanguage

English

Journal_Title

Circuits and Systems II: Express Briefs, IEEE Transactions on

Publisher

ieee

ISSN

1549-7747

Type

jour

DOI

10.1109/TCSII.2007.903218

Filename

4358618