A wide dynamic range compensated OTA for balanced filters

Author

Galvez-Durand, Federico ; Caloba, Luiz

Author_Institution

COPPE, Univ. Federal do Rio de Janeiro, Brazil

Volume

2

fYear

1994

fDate

3-5 Aug 1994

Firstpage

1123

Abstract

In this paper we propose an operational transconductance amplifier (OTA) with DC gain greater than 80 dB, improved frequency response and wide linear dynamic input range. Also, we propose a novel common mode feedback circuit, necessary for balanced filter common mode voltage stabilization. An elliptic low-pass filter simulated using this OTA exhibits a THD less than 1% while varying its cutoff frequency from 8 MHz to 12 MHz for a 0.8 V_pp differential input and ±2.5 V power supply

Keywords

active filters; compensation; differential amplifiers; elliptic filters; feedback amplifiers; frequency response; low-pass filters; operational amplifiers; -2.5 V; 2.5 V; 8 to 12 MHz; balanced filters; common mode feedback circuit; common mode voltage stabilization; compensated OTA; cutoff frequency; elliptic low-pass filter; frequency response; operational transconductance amplifier; wide dynamic range; Circuit simulation; Cutoff frequency; Dynamic range; Feedback circuits; Frequency response; Low pass filters; Operational amplifiers; Power supplies; Transconductance; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1994., Proceedings of the 37th Midwest Symposium on

Conference_Location

Lafayette, LA

Print_ISBN

0-7803-2428-5

Type

conf

DOI

10.1109/MWSCAS.1994.519008

Filename

519008