Paul Transmission Lines in Digital Systems for EMC Practitioners

1. Auflage 2011
ISBN: 978-1-118-14556-2
Verlag: John Wiley & Sons
Format: EPUB
Kopierschutz: Adobe DRM (»Systemvoraussetzungen)

E-Book, Englisch, 288 Seiten, E-Book

This is a brief but comprehensive book covering the set of EMCskills that EMC practitioners today require in order to besuccessful in high-speed, digital electronics. The basicskills in the book are new and weren't studied in mostcurricula some ten years ago. The rapidly changing digitaltechnology has created this demand for a discussion of new analysisskills particularly for the analysis of transmission lineswhere the conductors that interconnect the electronic modules havebecome "electrically large," longer than a tenth of awavelength, which are increasingly becoming important. Crosstalk between the lines is also rapidly becoming asignificant problem in getting modern electronic systems to worksatisfactorily. Hence this text concentrates on the modelingof "electrically large" connection conductors wherepreviously-used Kirchhoff's voltage and current laws andlumped-circuit modeling have become obsolete because of theincreasing speeds of modern digital systems. This has causedan increased emphasis on Signal Integrity.
Until as recently as some ten years ago, digital system clockspeeds and data rates were in the hundreds of megahertz (MHz)range. Prior to that time, the "lands" on printedcircuit boards (PCBs) that interconnect the electronic modules hadlittle or no impact on the proper functioning of those electroniccircuits. Today, the clock and data speeds have moved intothe low gigahertz (GHz) range.

Autoren/Hrsg.

Paul, Clayton R.

Inhaltsverzeichnis

Preface xi
1 Transmission Lines: Physical Dimensions vs. ElectricDimensions 1
1.1 Waves, Time Delay, Phase Shift, Wavelength, and ElectricalDimensions, 4
1.2 Spectral (Frequency) Content of Digital Waveforms and TheirBandwidths, 10
1.3 The Basic Transmission-Line Problem, 22
2 Time-Domain Analysis of Two-Conductor Lines 31
2.1 The Transverse Electromagnetic Mode of Propagation and theTransmission-Line Equations, 32
2.2 The Per-Unit-Length Parameters, 37
2.2.1 Wire-Type Lines, 37
2.2.2 Lines of Rectangular Cross Section, 47
2.3 The General Solutions for the Line Voltage and Current,50
2.4 Wave Tracing and Reflection Coefficients, 54
2.5 A Simple Alternative to Wave Tracing in the Solution ofTransmission Lines, 60
2.6 The SPICE (PSPICE) Exact Transmission-Line Model, 70
2.7 Lumped-Circuit Approximate Models of the Line, 75
2.8 Effects of Reactive Terminations on Terminal Waveforms,84
2.8.1 Effect of Capacitive Terminations, 85
2.8.2 Effect of Inductive Terminations, 87
2.9 Matching Schemes for Signal Integrity, 89
2.10 Effect of Line Discontinuities, 96
2.11 Driving Multiple Lines, 101
3 Frequency-Domain Analysis of Two-Conductor Lines103
3.1 The Transmission-Line Equations for Sinusoidal Steady-State(Phasor) Excitation of the Line, 104
3.2 The General Solution for the Line Voltages and Currents,105
3.3 The Voltage Reflection Coefficient and Input Impedance ofthe Line, 106
3.4 The Solution for the Terminal Voltages and Currents, 108
3.5 The SPICE Solution, 111
3.6 Voltage and Current as a Function of Position on the Line,112
3.7 Matching and VSWR, 115
3.8 Power Flow on the Line, 117
3.9 Alternative Forms of the Results, 120
3.10 Construction of Microwave Circuit Components UsingTransmission Lines, 120
4 Crosstalk in Three-Conductor Lines 125
4.1 The Multiconductor Transmission-Line Equations, 125
4.2 The MTL Per-Unit-Length Parameters of Inductance andCapacitance, 131
4.2.1 Wide-Separation Approximations for Wires, 135
4.2.2 Numerical Methods, 145
5 The Approximate Inductive-Capacitive Crosstalk Model155
5.1 The Inductive-Capacitive Coupling Approximate Model,159
5.2 Separation of the Crosstalk into Inductive and CapacitiveCoupling Components, 166
5.3 Common-Impedance Coupling, 172
5.4 Effect of Shielded Wires in Reducing Crosstalk, 173
5.4.1 Experimental Results, 182
5.5 Effect of Shield Pigtails, 183
5.5.1 Experimental Results, 187
5.6 Effect of Multiple Shields, 188
5.6.1 Experimental Results, 188
5.7 Effect of Twisted Pairs of Wires in Reducing Crosstalk,197
5.7.1 Experimental Results, 203
5.8 The Shielded Twisted-Pair Wire: The Best of Both Worlds,209
6 The Exact Crosstalk Prediction Model 211
6.1 Decoupling the Transmission-Line Equations with ModeTransformations, 212
6.2 The SPICE Subcircuit Model, 215
6.3 Lumped-Circuit Approximate Models of the Line, 231
6.4 A Practical Crosstalk Problem, 237
Appendix A Brief Tutorial on Using PSPICE 245
Index 267

Über Autor(innen)

CLAYTON R. 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.