Transmission Lines in Digital Systems for Emc Practitioners

by Paul, Clayton R.

• ISBN13: 9781118143995
• ISBN10: 111814399X
• Edition: 1st
• Format: Hardcover
• Copyright: 2011-11-22
• Publisher: Wiley

Summary

This is a brief but comprehensive book covering the set of EMC skills that EMC practitioners today require in order to be successful in high-speed, digital electronics.  The basic skills in the book are new and weren't studied in most curricula some ten years ago.  The rapidly changing digital technology has created this demand for a discussion of new analysis skills particularly for the analysis of transmission lines where the conductors that interconnect the electronic modules have become ;electrically large, ; longer than a tenth of a wavelength, which are increasingly becoming important.  Crosstalk between the lines is also rapidly becoming a significant problem in getting modern electronic systems to work satisfactorily.  Hence this text concentrates on the modeling of ;electrically large ; connection conductors where previously-used Kirchhoff's voltage and current laws and lumped-circuit modeling have become obsolete because of the increasing speeds of modern digital systems.  This has caused an increased emphasis on Signal Integrity. Until as recently as some ten years ago, digital system clock speeds and data rates were in the hundreds of megahertz (MHz) range.  Prior to that time, the ;lands ; on printed circuit boards (PCBs) that interconnect the electronic modules had little or no impact on the proper functioning of those electronic circuits.  Today, the clock and data speeds have moved into the low gigahertz (GHz) range.

Author Biography

Clayton k, Paul. PhD. is Professor and Sam Nunn Eminent Chair in Aerospace Engineering in the Department of Electrical and Computer Engineering at Mercer University. The author of twelve electrical engineering textbooks, he has also published more than 200 technical papers primarily on the electromagnetic compatibility of electronic systems. Dr. Paul is a Fellow of the IEEE and a member of Tau Beta Pi and Eta Kappa Nu.

Table of Contents

Preface	p. xi
ansmission Lines: Physical Dimensions vs Electric Dimensions	p. 1
Waves, Time Delay, Phase Shift, Wavelength, and Electrical Dimensions	p. 4
Spectral (Frequency) Content of Digital Waveforms and Their Bandwidths	p. 10
The Basic Transmission-Line Problem	p. 22
Time-Domain Analysis of Two-Conductor Lines	p. 31
The Transverse Electromagnetic Mode of Propagation and the Transmission-Line Equations	p. 32
The Per-Unit-Length Parameters	p. 37
Wire-Type Lines	p. 37
Lines of Rectangular Cross Section	p. 47
The General Solutions for the Line Voltage and Current	p. 50
Wave Tracing and Reflection Coefficients	p. 54
A Simple Alternative to Wave Tracing in the Solution of Transmission Lines	p. 60
The Spice (PSPICE) Exact Transmission-Line Model	p. 70
Lumped-Circuit Approximate Models of the Line	p. 75
Effects of Reactive Terminations on Terminal Waveforms	p. 84
Effect of Capacitive Terminations	p. 85
Effect of Inductive Terminations	p. 87
Matching Schemes for Signal Integrity	p. 89
Effect of Line Discontinuities	p. 96
Driving Multiple Lines	p. 101
Frequency-Domain Analysis of Two-Conductor Lines	p. 103
The Transmission-Line Equations for Sinusoidal Steady-State (Phasor) Excitation of the Line	p. 104
The General Solution for the Line Voltages and Currents	p. 105
The Voltage Reflection Coefficient and Input Impedance of the Line	p. 106
The Solution for the Terminal Voltages and Currents	p. 108
The SPICE Solution	p. 111
Voltage and Current as a Function of Position on the Line	p. 112
Matching and VSWR	p. 115
Power Flow on the Line	p. 117
Alternative Forms of the Results	p. 120
Construction of Microwave Circuit Components Using Transmission Lines	p. 120
Crosstalk in Three-Conductor Lines	p. 125
The Multiconductor Transmission-Line Equations	p. 125
The MTL Per-Unit-Length Parameters of Inductance and Capacitance	p. 131
Wide-Separation Approximations for Wires	p. 135
Numerical Methods	p. 145
The Approximate Inductive-Capacitive Crosstalk Model	p. 155
The Inductive-Capacitive Coupling Approximate Model	p. 159
Separation of the Crosstalk into Inductive and Capacitive Coupling Components, 166
Common-Impedance Coupling	p. 172
Effect of Shielded Wires in Reducing Crosstalk	p. 173
Experimental Results	p. 182
Effect of Shield Pigtails	p. 183
Experimental Results	p. 187
Effect of Multiple Shields	p. 188
Experimental Results	p. 188
Effect of Twisted Pairs of Wires in Reducing Crosstalk	p. 197
Experimental Results	p. 203
The Shielded Twisted-Pair Wire: The Best of Both Worlds	p. 209
The Exact Crosstalk Prediction Model	p. 211
Decoupling the Transmission-Line Equations with Mode Transformations	p. 212
The SPICE Subcircuit Model	p. 215
Lumped-Circuit Approximate Models of the Line	p. 231
A Practical Crosstalk Problem	p. 237
Brief Tutorial on Using PSPICE	p. 245
Index	p. 267
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