Publication:
Low-power class-AB CMOS voltage feedback current operational amplifier with tunable gain and bandwidth

Consultable a partir de

Date

2014

Authors

Pennisi, Salvatore
Palumbo, Gaetano

Director

Publisher

IEEE
Acceso abierto / Sarbide irekia
Artículo / Artikulua
Versión aceptada / Onetsi den bertsioa

Project identifier

MICINN//TEC2010-21563-C02-01/ES/

Abstract

A CMOS class AB variable gain Voltage Feedback Current Operational Amplifier (VFCOA) is presented. The implementation is based on class AB second generation current conveyors and exploits an electronically tunable transistorized feedback network. The circuit combines high linearity, low power consumption and variable gain range from 0 to 24 dB with nearly constant bandwidth, tunable from 1 to 3 MHz. A prototype has been fabricated in a 0.5-um technology and occupies a total area of 0.127 mm2. The VFCOA operates using a 3.3-V supply with static power consumption of 280.5 uW. Measurements for maximum gain configuration show a dynamic range (1% THD@300kHz) of 87.5 dB and a THD lower than -40dB for an output current 23 times the bias current.

Keywords

CMOS analog integrated circuits, Voltage feedback operational amplifier, Current mode, Class AB, Current amplifier

Department

Ingeniería Eléctrica y Electrónica / Ingeniaritza Elektrikoa eta Elektronikoa

Faculty/School

Degree

Doctorate program

Editor version

Funding entities

This work has been supported in part by the Spanish Direccion General de Investigacion under grant TEC2010-21563-C02-01/MIC.

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