Platform Interference in Wireless Systems (eBook)

Front Cover 1
Platform Interference in Wireless Systems 4
Copyright Page 5
Table of Contents 6
Preface 10
Chapter 1. Introduction 12
1.1 Setting The Scene 12
1.2 Wireless vs. EMI 13
1.3 Addressing the Fundamentals 15
1.3.1 Platform Interference: Describing the Problem 17
1.4 Platform RF Snapshots 37
1.5 Platform RF Sources: Summing It All Up 45
Chapter 2. The Structure of Signals 48
2.1 Time Has Little To Do with Infinity and Jelly Doughnuts 48
2.2 Platform Signals: Preliminaries in Spectral Analysis 49
2.3 Harmonic Variation with Time 51
2.4 Variation with Duty Cycle 54
2.5 Nonrepetitive Signals 66
2.6 Modifying a Clock 68
2.7 Random Data Sequences as Signals 70
2.8 Spectra of Display Symbols 77
2.9 Summary 86
References 87
Chapter 3. Analysis of Symbols 88
3.1 When People Finally Come to Understand Your Vision . . . It’s Time for a New Vision 88
3.2 Analysis of Display Symbols 103
3.2.1 Justification for the Differential Operator 113
3.3 Wireless Performance in the Presence of Radiated Emissions from Digital Display Symbols 115
3.4 Developing the Analysis of Differential Symbols 118
3.5 The Impact of Pulse Width and Edge Rate Jitter on the Expected EMI/RFI 124
3.6 Summary 130
References 130
Chapter 4. Measurement Methods 132
4.1 One Measurement is Worth a Thousand Opinions 132
4.2 Near-Field Scans of Clock ICs 139
4.3 Measurements Beyond the Near Field: Transition Region 144
4.4 The Near-Field, Far-Field Transition 144
4.5 Far-Field Measurements 152
4.6 Other Measurement Methods 153
4.7 Summary 156
References 156
Chapter 5. Electromagnetics 158
5.1 He Must Go by Another Way Who Would Escape this Wilderness 158
5.2 The Time-Varying Maxwell’s Equations 165
5.3 Electric and Magnetic Potentials 167
5.4 Radiation Mechanisms 169
References 174
Chapter 6. Analytical Models 176
6.1 Honest Analysis Gets in the Way of Results Desired Emotionally 176
6.2 The Electric Dipole 176
6.3 Field Impedance of the Elementary Electric Dipole 183
6.4 The Extended Dipole Radiator 185
6.5 The Magnetic Dipole 191
6.6 Developing Simple Analytical Structures for Real Devices 196
6.7 Developing Channel Models 207
6.8 Summary 221
References 221
Chapter 7. Connectors, Cables, and Power Planes 224
7.1 Chance and Caprice Rule the World 224
7.2 Power Distribution Radiated Emissions 226
7.3 Investigating the Radiated Emissions Potentials of Power Distributions in Packages and Silicon 240
7.4 Further Investigations with Various Power Topologies 248
7.4.1 Substrate Noise 256
7.5 Summary 262
References 262
Chapter 8. Passive Mitigation Techniques 264
8.1 Introduction 264
8.2 Passive Mitigation 265
8.2.1 Shielding 265
8.2.2 Absorbers 287
8.2.3 Layout 292
References 300
Chapter 9. Active Mitigation 302
9.1 Frequency Planning 302
9.2 Frequency Content 308
9.2.1 Spread Spectrum Clocking 312
9.3 Radio Improvements 316
9.3.1 Noise Estimation 317
9.4 Closing Remarks 319
References 320
Appendix 322
Index 340