A Highly Linear Operational Transconductance Amplifier (OTA) with High Common Mode Rejection Ratio

Author

Rezaei, Farzan ; Azhari, Seyed Javad

Author_Institution

Dept. of Electron., Iran Univ. of Sci. & Technol., Tehran, Iran

fYear

2010

fDate

9-10 Feb. 2010

Firstpage

18

Lastpage

22

Abstract

This paper presents a highly linear Operational Transconductance Amplifier (OTA) that combines two linearization techniques, one with adaptive biasing of differential pairs and second with using of resistive source degeneration. OTA has Â±0.9 v power supply and consumes 456 Â¿w. Improvement of adaptive bias circuit has enhanced the CMRR to 135 dB in DC. OTA has been simulated with TSMC 0.18 Â¿m technology in Hspice. The simulated third order harmonic distortion (HD3) with applying a 600 mv_P-P differential input, remains below -67 dB at 3 MHz frequency.

Keywords

SPICE; operational amplifiers; CMRR; Hspice; OTA; adaptive bias circuit; differential pairs adaptive biasing; frequency 3 MHz; high common mode rejection ratio; linearization techniques; operational transconductance amplifier; power 456 muW; resistive source degeneration; size 0.18 mum; third order harmonic distortion; voltage 0.9 V; Circuit simulation; Differential amplifiers; Harmonic distortion; Linearity; Linearization techniques; Operational amplifiers; Signal processing; Tail; Transconductance; Transconductors; CMRR; Operational Transconductance Amplifier (OTA); adaptive bias circuit; linearity; source degeneration;

fLanguage

English

Publisher

ieee

Conference_Titel

Signal Acquisition and Processing, 2010. ICSAP '10. International Conference on

Conference_Location

Bangalore

Print_ISBN

978-1-4244-5724-3

Electronic_ISBN

978-1-4244-5725-0

Type

conf

DOI

10.1109/ICSAP.2010.39

Filename

5432634