Platform Interference in Wireless Systems

Platform Interference in Wireless Systems

Models, Measurement, and Mitigation

1st Edition - April 25, 2008

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  • Authors: Kevin Slattery, Harry Skinner
  • eBook ISBN: 9780080558561
  • Hardcover ISBN: 9780750687577

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Description

Intra-system EMC problems are becoming increasingly common in mobile devices, ranging from notebook PCs to cell phones, with RF/wireless capbilities. These issues range from minor annoyances to serious glitches which impede the functioning of the device. This book gives a thourough review of electromagnetic theory (including Maxwell's equations), discusses possible sources and causes of intra-system interference, shows to use models and analysis to discover potential sources of intra-system EMC in a design, how to use appropriate tests and measurements to detect intra-system EMC problems, and finally extensively discusses measures to mitigate or totally eliminate intra-system EMC problems. With more and more mobile devices incorporating wirless capability (often with multiple wireless systems, such as Bluetooth and WiFi), this book should be part of the reference shelf of every RF/wireless engineer and mobile device designer.

Key Features

  • Addresses a growing problem in RF/wireless devices----interference created inside the devices, which impair their operation
  • Covers devices, ranging from laptop PCs to mobile phones to Bluetooth headsets
  • Explains the sources of such intra-system interference, how to detect and measure such interference, design techniques for mitigating the interference, and proven techniques for eliminating the interference

Readership

RF/Wireless Engineers; Mobile Device Designers

Table of Contents

  • 1. Introduction
    Describing the problem
    The Radio Channel
    Platform emissions impact on a radio receiver
    Platform to radio isolation requirements
    Platform RF snapshots
    3 meter measurements
    Platform RF as seen at the radio front end
    Broad-band measurements in the near field
    Desktop and notebook platforms
    Small form factor platforms
    System components as noise sources
    Platform RFI sources- Summing it up

    Section 2: Platform Signals
    2. The Structure of Signals
    Harmonic variation with time
    Signal Asymmetry
    Variation with duty cycle
    Non-repetitive signals
    Spread spectrum clocks
    Data sequences as signals
    The impact of equalization
    Platform display symbols
    The spectrum of complex symbol sequences
    Time structure of symbols
    Comparison of PRBS, clock and symbol sequences

    3. Analysis of Symbols
    Ordering finite symbol sets for RFI
    Wireless performance in the presence of display symbols
    Measuring interference impact
    Analysis of differential symbols
    Signal structure jitter and the impact on EMI and RFI

    Section 3: Measurement and Models
    4. Measurement Methods
    Measurement methods, near field scanning
    Fields in dielectrics
    Locating system sources of interference
    Near field scans of clock ICs
    Energy flow in the near field and the transition to the far field
    Broad-band measurements with a horn antenna
    Measurements with the GTEM cell
    Far field measurements using anechoic chambers
    Reverberation chambers

    5. Electromagnetics
    Electromagnetic units
    Maxwell’s equations for the static condition
    Maxwell’s equations for the time varying condition
    The electric scalar potential
    The magnetic scalar potential
    Radiation mechanisms

    6. Analytical Models
    The elementary electric dipole
    The field impedance of the electric dipole
    The extended dipole model
    Measured near fields over silicon
    Building a model of the radiation surface of multiple sources
    The magnetic dipole
    Building system models using PCI Express
    Comparing model and measurement

    7. Connectors, cables and power planes
    Power Distribution Radiated Emissions
    Further investigations with various power topologies
    Chapter Summary

    Section 4: Mitigation Techniques
    8. Passive Techniques
    Introduction
    Passive Mitigation
    Shielding
    Absorbers
    Layout

    9. Active Mitigation
    Frequency Planning
    Controlling Frequency Content
    Radio Improvements
    Appendix A: Appendix to Chapter 2
    Appendix B: Appendix to Chapter 3
    References

Product details

  • No. of pages: 416
  • Language: English
  • Copyright: © Newnes 2008
  • Published: April 25, 2008
  • Imprint: Newnes
  • eBook ISBN: 9780080558561
  • Hardcover ISBN: 9780750687577

About the Authors

Kevin Slattery

Harry Skinner

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