Title :
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
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 Vpp 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;
Conference_Titel :
Circuits and Systems, 1994., Proceedings of the 37th Midwest Symposium on
Conference_Location :
Lafayette, LA
Print_ISBN :
0-7803-2428-5
DOI :
10.1109/MWSCAS.1994.519008
