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Analog Circuit Design Volume Three by John Hamburger, Bob Dobkin

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Chapter 505

A low power, high output current dual CFA makes xDSL line driving clean and easy

Adolfo A Garcia

Abstract

A low power, high output current dual current feedback amplifier (CFA) that makes xDSL line driving clean and easy is described.

Keywords

Current feedback amplifier

CFA

xDLS system

LT1497

Introduction

Driving the balanced lines of high speed modems has become a very popular application for high speed, high output current, dual operational amplifiers. High amplifier speed is required to faithfully process signal passbands of at least 1MHz bandwidth, and high output currents are required to meet peak drive levels into 100Ω or 135Ω termination. Taking into account peak-to-average signal ratios in these applications, ...

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