A low voltage CMOS transresistance-based variable gain amplifier

Author

Yoo, Seoung-Jae ; Ravindran, Arun ; Ismail, Mohammed

Author_Institution

Dept. of Electr. Eng., Ohio state Univ., Columbus, OH, USA

Volume

1

fYear

2004

fDate

23-26 May 2004

Abstract

This paper presents a CMOS realization of a low voltage transresistance amplifier (LVTA) that is capable of operation at a supply voltage as low as 1.5V in a 5V CMOS technology. The circuit employs current feedback to reduce stacking of devices between the supply rails and to lower voltage signal swings, enabling low voltage operation. A R-2R ladder based variable gain amplifier (VGA) designed using the LVTA shows good linearity and a closed loop gain independent of bandwidth. Measured results for a prototype fabricated in a 0.5μ CMOS technology are presented that experimentally demonstrates the proposed approach.

Keywords

CMOS analogue integrated circuits; circuit feedback; ladder networks; low-power electronics; operational amplifiers; 0.5 micron; 5 V; CMOS technology; R-2R ladder; closed loop gain; current feedback; low voltage transresistance amplifier; supply rails; variable gain amplifier; voltage signal swings; Bandwidth; CMOS technology; Feedback circuits; Gain; Linearity; Low voltage; Operational amplifiers; Prototypes; Rails; Stacking;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2004. ISCAS '04. Proceedings of the 2004 International Symposium on

Print_ISBN

0-7803-8251-X

Type

conf

DOI

10.1109/ISCAS.2004.1328318

Filename

1328318