Pcb Design for Real-World Emi Control

by Archambeault, Bruce R.

ISBN13:

9781402071300

ISBN10:

1402071302

Format:

Hardcover

Pub. Date:

8/1/2002

Publisher(s):

Kluwer Academic Pub

Other versions by this Author

List Price: ~~$183.00~~

Rent Textbook

We're Sorry
Sold Out

Used Textbook

We're Sorry
Sold Out

eTextbook

We're Sorry
Not Available

New Textbook

We're Sorry
Sold Out

Summary

PCB Design for Real-World EMI Control is intended for EMC designers and electronic design engineers. It emphasizes understanding basic concepts of controlling the currents on printed circuit boards (pcb's), and provides a wealth of insightful information detailing the possible sources of emissions. Numerous design strategies are presented to help readers understand how to produce, control and eliminate emission sources.Additional highlights include the following:-Information explaining how to design pcb's to pass EMC Requirements the first time! -Controlling intentional and unintentional currents at their source; -Decoupling strategies explained and myths exposed; -Proper I/O filter design and connection strategy explained; -Not simply a list of do's and don't's....but an explanation of "why" things work as they do; -"Ground is a place where potatoes and carrots grow!" -Basic shielding design considerations for PCBs included, and more.This 'hands-on' book will help designers understand "why" or "why not" to implement a specific design practice. PCB Design for Real-World EMI Control will be an invaluable resource for the pcb designer.

Introduction to EMI/EMC Design for Printed Circuit Boards

(8)

Introduction to EMI/EMC

(3)

EMI Emissions Sources

(1)

Inductance

(1)

``Ground''

(1)

Shielding

(1)

Summary

(2)

EMC Fundamentals

(16)

Introduction

(1)

Coupling Mechanisms

(4)

Electric Field Coupling

(2)

Magnetic Field Coupling

(2)

Signal Spectra

(5)

Clock Signals Harmonic Frequencies

(3)

Hertz vs. Bits-per-Second

(1)

Non-Squarewave Data Signals

(1)

Resonance Effects

(2)

Magic and Luck

(1)

Potential Emissions Sources

(2)

Shielded Products

(1)

Unshielded Products

(1)

Intentional Signal Content

(1)

Summary

(2)

What is Inductance?

(18)

Introduction

(1)

Electromagnetic Induction

(2)

Mutual Inductance

(2)

Self-Inductance

(7)

Self-Inductance per Unit Length

(3)

Partial Inductance

(4)

Summary

(3)

The Ground Myth

(26)

Where Did The Term ``Ground'' Originate?

(3)

What Do We Mean When We Say ``Ground''?

(9)

Signal Reference

(3)

Power Reference

(1)

Chassis Reference

(1)

Unshielded Cables

(3)

Shielded Cables

(1)

Earth Safety Reference

(1)

`Ground' is Not a Current Sink

(1)

Referencing Strategies

(3)

Single-Point Ground-Reference Strategy

(1)

Multi-Point Ground-Reference Strategy

(2)

Grounding Heatsinks to PC boards

(6)

Heatsink ``Grounding'' Example

(3)

PCB Reference Connection to Chassis Reference

(2)

I/O Area Connection

(2)

Summary

(3)

Return Current Design

(16)

Introduction

(2)

Split Reference Planes

(5)

Stitching Capacitors

(4)

Trace Changing Reference Planes

(4)

Motherboards and Daughter Cards

(3)

Connector Pin Assignments

(1)

Summary

(2)

Controlling EMI Sources -- Intentional Signals

(20)

Introduction

(1)

Critical Signals

(1)

Intentional Signals

(7)

Intentional Signals -- Loop-Mode

(2)

Controlling Emissions from Intentional Signals -- Loop-Mode

(1)

Intentional Signals -- Common-mode

(3)

Intentional Signals -- Common-mode with Interrupted Return Path

(3)

Critical Signal Traces Crossing Splits

(1)

Critical Signals Through Vias

100

(2)

Summary

102

(3)

Controlling EMI Sources -- Unintentional Signals

105

(16)

Introduction

105

(1)

Unintentional Signals

106

(1)

Unintentional Signals -- Common-mode

106

(2)

Controlling Emissions from Unintentional Signals -- Common-mode

108

(5)

Unintentional Signals -- `Crosstalk' Coupling onto I/O Lines

113

(2)

Controlling Emissions from Unintentional Signals -- `Crosstalk' Coupling to I/O Lines

115

(3)

Summary

118

(3)

Decoupling Power/Ground Planes

121

(30)

Introduction

121

(1)

Background

122

(2)

Calculating the Source of Decoupling Noise

124

(6)

Decoupling Noise from ASIC/ICs power pins

124

(6)

Decoupling Capacitor Effectiveness

130

(18)

Test Board Description

131

(3)

Empty Test Board Configuration

134

(2)

Quantity of Distributed (Global) Decoupling Capacitors (.0luf Only)

136

(1)

Quantity of Distributed Decoupling Capacitors (0.0luf and 330 pF)

137

(3)

Selecting the Value of the Decoupling Capacitors

140

(1)

Perfect Decoupling Capacitors

140

(1)

Source Vs Distributed Decoupling

141

(3)

Buried Capacitance Decoupling

144

(2)

Lossy Capacitors

146

(2)

Summary

148

(3)

EMC Filter Design

151

(20)

Introduction

151

(1)

Filter Design Concepts

151

(4)

Filter Configurations

155

(8)

Two-Component Filter Configurations

155

(2)

Reference Connection for Two-Component Filters

157

(4)

Three Component Filter Configurations

161

(2)

Single Component Filter Configurations

163

(1)

Non-Ideal Components and the Impact on Filters

163

(5)

Non-Ideal Capacitors

164

(2)

Non-Ideal Ferrite Beads

166

(2)

Non-Ideal Zero Ohm Resistors

168

(1)

Common-Mode Filters

168

(1)

Summary

169

(2)

Using Signal Integrity Tools for EMC Analysis

171

(16)

Introduction

171

(1)

Intentional Current Spectrum

172

(5)

Trace Current for Decoupling Analysis

177

(2)

Differential Signals Analysis

179

(6)

Internal Differential Signal Lines

181

(1)

External I/O Differential Signal Lines

182

(3)

Crosstalk Analysis

185

(1)

Summary

185

(2)

Printed Circuit Board Layout

187

(12)

Introduction

187

(1)

PC Board Stack-up

187

(8)

Many Layer Boards

188

(3)

Six-Layer Boards

191

(1)

Four-Layer Boards

192

(1)

One and Two-Layer Boards

193

(2)

Component Placement

195

(1)

Isolation

195

(1)

Summary

196

(3)

Shielding in Enclosures with Apertures

199

(22)

Introduction

199

(3)

Resonance Mode within Shielded Enclosures

202

(6)

Shielded Enclosures

208

(5)

Apertures and Openings

208

(2)

Gaskets

210

(3)

Predicting the Shielding Effectiveness of Enclosures with Apertures

213

(2)

Shielding the PC Board Edge

215

(1)

Cable Shields

216

(2)

Summary

218

(3)

What To Do If a Product Fails in the EMC Lab

221

(10)

Introduction

221

(1)

Where Does the Signal Come From?

222

(1)

How Does the Signal Get Out of the Shielded Enclosure?

223

(4)

Leaks through slots holes and apertures

223

(2)

Conducted through the shield on cables and wires

225

(1)

Leaks from imperfect mating of shielded cable shields to the enclosure

226

(1)

Coupling Mechanism

227

(2)

Case 1 Clock signal leaking from seam

228

(1)

Case 2 Clock signal leaking from an unshielded cable

228

(1)

Summary

229

(2)

Appendix A Introduction to EMI/EMC Computational Modeling

231

(10)

A.1 Introduction

231

(1)

A.2 Why Is EMI/EMC Modeling Important?

232

(1)

A.3 EMI/EMC Modeling: State of the Art

233

(1)

A.4 Tool Box Approach

234

(1)

A.5 Brief Description of EMI Modeling Techniques

235

(4)

A.5.1 Finite Difference Time-Domain

235

(2)

A.5.2 Method of Moments

237

(1)

A.5.3 Finite Element Method

238

(1)

A.6. Other Uses for Electromagnetic Modeling

239

(1)

A.7. Summary

239

(2)

Index

241

Pcb Design for Real-World Emi Control

9781402071300

Rent Textbook

Used Textbook

eTextbook

New Textbook

Summary

Table of Contents