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Analog Circuit Design Volume Three by John Hamburger, Bob Dobkin

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Chapter 326

Single 4-input IC gives over 90dB crosstalk rejection at 10MHz and is expandable

John Wright

Abstract

A single 4-input IC that gives over 90dB crosstalk rejection at 10MHz and is expandable is described.

Keywords

Video design

crosstalk

LT1204 4-input video multiplexer

Introduction

Professional video systems need to multiplex between many signals without interference from adjacent video sources that are not selected. Final system crosstalk rejection of all non-selected or “Hostile” signals of 72dB is regarded as “professional quality.” This level of isolation is very difficult to achieve because every doubling in the number of inputs degrades the crosstalk by 6dB. In the past because no single IC was good enough, cascades ...

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