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Application Report
SNLA107A–June 2008–Revised April 2013
AN-1862 Reducing Radiated Emissions in Ethernet 10/100
LAN Applications
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ABSTRACT
This application report explains how Texas Instruments' PHYTER products help system designers to
reduce radiated emissions in Ethernet 10/100 LAN applications.
Contents
1 Introduction .................................................................................................................. 2
2 Key Recommendations ..................................................................................................... 2
3 Background: Ethernet Signaling Basics .................................................................................. 3
3.1 Differential Signaling ............................................................................................... 3
3.2 Single Ended Signaling ........................................................................................... 3
4 Sources of EMI in Ethernet Applications ................................................................................. 4
4.1 Differential Signal Path Imbalance ............................................................................... 4
4.2 Chassis Coupled Noise ........................................................................................... 5
4.3 PCB Coupled Noise ............................................................................................... 5
5 System Test Data ........................................................................................................... 7
6 Summary ..................................................................................................................... 8
7 References ................................................................................................................... 9
List of Figures
1 MDI Signal Energy between Networked Systems...................................................................... 3
2 MII Signal Energy........................................................................................................... 4
3 Chassis and Ground Plane Layout ....................................................................................... 5
4 Bypassing and Isolating Power and Ground Pins ...................................................................... 6
5 Test System Configuration................................................................................................. 7
PHYTER is a registered trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
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SNLA107A–June 2008–Revised April 2013 AN-1862 Reducing Radiated Emissions in Ethernet 10/100 LAN Applications
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