A Class-AB CMOS Variable Gain Amplifier for Low-Voltage Applications

Author

Khumsat, Phanumas ; Sakphrom, Sirapom ; Thanachayanont, Apimunt

Author_Institution

Prince of Songkhla Univ. Hat-Yai, Songkhla

fYear

2007

fDate

26-28 Sept. 2007

Firstpage

49

Lastpage

52

Abstract

A compact class-AB variable gain amplifier has been proposed. The amplifier structure is based on two-stage architecture comprising a linear transconductor cascaded by a class-AB current amplifier-based feedback transimpedance amplifier. The major advantage of such VGA circuit is its ability to offer a good degree of signal linearity without sacrificing the original advantages of its predecessor on both aspects of the power consumption and circuit complexity. Superiority of the proposed VGA has been confirmed by circuit simulation employing 0.18mum standard CMOS technology in designing a 10-MHz VGA under 0.5-V voltage supply with MOS´s minimum threshold voltage of 0.43V while draining static power consumption less than 25muW.

Keywords

CMOS integrated circuits; circuit simulation; radiofrequency amplifiers; CMOS technology; MOS minimum threshold voltage; VGA circuit; circuit complexity; circuit simulation; class-AB current amplifier; compact class-AB CMOS variable gain amplifier; feedback transimpedance amplifier; frequency 10 MHz; linear transconductor; low-voltage application; power consumption; signal linearity; size 0.18 mum; voltage 0.43 V; voltage 0.5 V; Bandwidth; CMOS technology; Circuits; Energy consumption; Gain; Linearity; Low voltage; Radiofrequency amplifiers; Transconductance; Transconductors;

fLanguage

English

Publisher

ieee

Conference_Titel

Integrated Circuits, 2007. ISIC '07. International Symposium on

Conference_Location

Singapore

Print_ISBN

978-1-4244-0797-2

Electronic_ISBN

978-1-4244-0797-2

Type

conf

DOI

10.1109/ISICIR.2007.4441793

Filename

4441793