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PCB Design Book

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PCB DESIGN FOR REAL-WORLD
EMICONTROL

THE KLUWER INTERNATIONAL SERIES
IN ENGINEERING AND COMPUTER SCIENCE

PCB DESIGN FOR REAL-WORLD
EMICONTROL

by

Bruce R. Archambeault
IBM Corporation
Research Triangle Park, NC

Springer Science+Business Media, LLC

.....

"

Electronic Services <>

ISBN 978-1-4757-3642-7

ISBN 978-1-4757-3640-3 (eBook)

DOI 10.1007/978-1-4757-3640-3

Library of Congress Cataloging-in-Publication Data
Archambeault, Bruce.
PCB design for real-world EMI control I by Bruce R. Archambeault.
p. cm.-- (The Kluwer international series in engineering and computer science; SECS 696)
Includes bibliographical references and index.
I. Printed circuits-Design and construction. 2. Electromagnetic
interference-Prevention. I. Title. II. Series.
TK7868.P7 An 2002
621.3815'31--dc21
2002073021

Copyright © 2002 by Springer Science+Business Media New York
Originally published by Kluwer Academic Publishers. Second Printing 2004.
Softcover reprint of the hardcover 1st edition 2004

This printing is a digital duplication of the original edition.
All rights reserved. No part of this publication may be reproduced, stored in a retrieval
system or transmitted in any form or by any means, mechanical, photo-copying,
recording, or otherwise, without the prior written permission of the publisher,
Springer Science+Business Media, LLC

Printed on acid-free paper.

Dedication

This book is dedicated to my wife, best friend, and the person
who is the center of my universe, Susan Archambeault.

Contents

1

Introduction to EMIlEMC Design
for Printed Circuit Boards
1.1
1.2
1.3
1.4
1.5
1.6

2

Introduction to EMIlEMC
EMI Emissions Sources
Inductance
"Ground"
Shielding
Summary

EMC Fundamentals

1
1
4

5
6
6

7

9

2.1 Introduction
9
2.2 Coupling Mechanisms
10
2.2.1 Electric Field Coupling
10
2.2.2 Magnetic Field Coupling
12
2.3 Signal Spectra
14
2.3.1 Clock Signals' Harmonic Frequencies 14
2.3.2 Hertz vs: Bits-per-Second
17
2.3.3 Non-Squarewave Data Signals
18
2.4 Resonance Effects
19
2.4.1 Magic and Luck
20
2.5 Potential Emissions Sources
21
2.5.1 Shielded Products
21
2.5.2 Unshielded Products
22
2.6 Intentional Signal Content
23
2.7 Summary
23

viii

3

What is Inductance?

25

3.1
3.2
3.3
3.4

25
25
27
29
33
36
40

Introduction
Electromagnetic Induction
Mutual Inductance
Self-Inductance
3.4.1 Self-Inductance per Unit Length
3.5 Partial Inductance
3.6 Summary

4

The Ground Myth

43

4.1 Where Did The Term "Ground" Originate?
4.2 What Do We Mean W...
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