A Very Linear OTA with V-I Conversion based on Quasi-Floating MOS Resistor

Author

Carvajal, R.G. ; Galan, J. ; Torralba, A. ; Lujan-Martínez, C. ; Ramirez-Angulo, Jaime ; Lopez-Martin, Antonio

Author_Institution

Escuela Superior de Ingenieros, Seville Univ., Sevilla

fYear

2007

fDate

27-30 May 2007

Firstpage

473

Lastpage

476

Abstract

This paper proposes a novel very linear tunable transconductor based on local feedback loops. The linear V-I conversion is accomplished using MOS resistors based on quasi-floating gate transistors. The absence of current mirrors in the signal path provides low sensitivity to transistor mismatch and decrease of nonlinear distortion. The OTA was designed in a 0.5 mum CMOS technology with plusmn1.65-V supply voltage. Simulation results show a THD of -80 dB at 100 kHz with 1 Vpp input signal. Good linearity of the OTA over a large tuning range is obtained.

Keywords

CMOS analogue integrated circuits; circuit feedback; integrated circuit design; operational amplifiers; resistors; 0.5 micron; 1 V; 100 kHz; CMOS technology; current mirrors; linear OTA; linear V-I conversion; linear tunable transconductor; local feedback loops; nonlinear distortion; operational transconductance amplifier; quasifloating MOS resistor; quasifloating gate transistors; CMOS technology; Feedback loop; Linearity; MOSFETs; Mirrors; Resistors; Transconductance; Transconductors; Tunable circuits and devices; Voltage control;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2007. ISCAS 2007. IEEE International Symposium on

Conference_Location

New Orleans, LA

Print_ISBN

1-4244-0920-9

Electronic_ISBN

1-4244-0921-7

Type

conf

DOI

10.1109/ISCAS.2007.378566

Filename

4252674