0
Platform Interference in Wireless Systems
1st Edition
Models, Measurement, and Mitigation
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
Chapter 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
Chapter 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
Chapter 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
Chapter 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
Details
- No. of pages:
- 416
- Language:
- English
- Copyright:
- © 2008