Design of a Linear CMOS OTA with Wide Input Voltage Range

Author

Kim, Doo-Hwan ; Yang, Sung-Hyun ; Kim, Ki-Sun ; Cho, Kyoung-Rok

Author_Institution

Dept. of Inf. & Commun. Eng., Chung-Buk Nat. Univ., Cheongju

fYear

2006

fDate

Oct. 18 2006-Sept. 20 2006

Firstpage

360

Lastpage

363

Abstract

This paper describes a new linear operational transconductance amplifier (OTA) operating under wide input voltage range. To improve the linearity of the OTA, we employ a mobility compensation circuit that combines the transistor paths operating at the triode and subthreshold regions. The common-mode control circuit consists of a common-mode feedback and common-mode feedforward. The circuit enhances linearity of the transconductance (Gm) under the wide input voltage range. The proposed OTA shows plusmn1% Gm variation and the total harmonic distortion (THD) of below -73-dB under the input range of plusmn1.1-V. The OTA is implemented using a 0.35-mum n-well CMOS process under 3.3-V supply

Keywords

CMOS analogue integrated circuits; harmonic distortion; integrated circuit design; operational amplifiers; 0.35 mum; 3.3 V; THD; common-mode control circuit; common-mode feedback; common-mode feedforward; linear CMOS OTA; linear operational transconductance amplifier; mobility compensation circuit; total harmonic distortion; transconductance; wide input voltage range; Attenuation; Feedback circuits; Filters; Impedance; Linearity; Operational amplifiers; Tail; Total harmonic distortion; Transconductance; Voltage; Common-mode feedback; Common-mode feedforward; OTA; mobility compensation;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications and Information Technologies, 2006. ISCIT '06. International Symposium on

Conference_Location

Bangkok

Print_ISBN

0-7803-9741-X

Electronic_ISBN

0-7803-9741-X

Type

conf

DOI

10.1109/ISCIT.2006.340065

Filename

4141576