A wide tunable range CMOS OTA

Author

Kaewdang, Khanittha ; Surakampontorn, Wanlop

Author_Institution

Dept. of Electr. & Electron. Eng., Ubon Ratchathani Univ., Warinchamrap

Volume

2

fYear

2008

fDate

14-17 May 2008

Firstpage

705

Lastpage

708

Abstract

A wide linear tunable range transconductor based on CMOS technology is proposed in this paper. The realization technique is achieved by squaring the transconductance gain (g_m) of the CMOS OTA. Its g_m can be linearly tuned by an external bias current for more than 3 decades (2 uA-3 mA), with less than 2% nonlinearity for the input-voltage linear range of about 1 Vp. The usefulness of the proposed linear tunable tranconductor is demonstrated through an application example, an electronically tunable biquad filter. The performance of the proposed circuit is discussed and confirmed through PSPICE simulation results.

Keywords

CMOS analogue integrated circuits; biquadratic filters; circuit tuning; operational amplifiers; CMOS; OTA; electronically tunable biquad filter; external bias current; operational transconductance amplifier; transconductance gain; wide linear tunable range transconductor; Active filters; CMOS technology; Circuit simulation; MOSFETs; SPICE; Transconductance; Transconductors; Tunable circuits and devices; Variable structure systems; Voltage control;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology, 2008. ECTI-CON 2008. 5th International Conference on

Conference_Location

Krabi

Print_ISBN

978-1-4244-2101-5

Electronic_ISBN

978-1-4244-2102-2

Type

conf

DOI

10.1109/ECTICON.2008.4600528

Filename

4600528