Constant and maximum bandwidth feedback amplifier with adaptive frequency compensation

Author

Pennisi, Salvatore ; Scotti, Giuseppe ; Trifiletti, Alessandro

Author_Institution

Dipt. di Ing. Elettr., Elettron. e Inf. (DIEEI), Univ. di Catania, Catania, Italy

fYear

2012

fDate

20-23 May 2012

Firstpage

436

Lastpage

439

Abstract

We demonstrated the feasibility of the adaptive frequency compensation approach to design maximum- and constant-bandwidth feedback amplifiers. A basic CMOS amplifier exhibiting 66-dB dc gain and 310-MHz gain-bandwidth product was designed. For closed-loop gains ranging from 1 to 10, the closed loop bandwidth was found never lower than 401 MHz. A similar amplifier with equal gain-bandwidth product, but adopting the traditional fixed compensation approach, would exhibit a closed-loop bandwidth decreased to 33 MHz when the gain magnitude is set to 10. The enhanced frequency performance is obtained with a 48% increase in current consumption, while the other main opamp performance parameters remain almost unchanged compared to the standard solution.

Keywords

CMOS integrated circuits; closed loop systems; compensation; feedback amplifiers; operational amplifiers; CMOS amplifier; adaptive frequency compensation; bandwidth 310 MHz; closed loop bandwidth; closed-loop gains; constant bandwidth; equal gain-bandwidth product; feedback amplifier; fixed compensation; gain 66 dB; maximum bandwidth; opamp performance parameters; Bandwidth; CMOS integrated circuits; Capacitors; Gain; Operational amplifiers; Resistors; Transistors;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems (ISCAS), 2012 IEEE International Symposium on

Conference_Location

Seoul

ISSN

0271-4302

Print_ISBN

978-1-4673-0218-0

Type

conf

DOI

10.1109/ISCAS.2012.6272057

Filename

6272057