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Common Mode Effects on
Multigigabit-per-second Interconnects

Conventional interconnect analysis techniques, including those cited in the IEEE 802.3ap standard [1], emphasize the evaluation of channel performance with respect to pure differential mode propagation. The effects of unwanted common mode and mode converted energy have typically been of secondary concern. With increasing data rates and the process imperfections of manufacturing, it becomes impossible to maintain a well balanced system, thus leading to higher amounts of common mode energy in differential systems. This paper investigates the common mode characteristics of different structures, such as various etch geometries, backplane connectors and twin-ax cables, with a focus on the signal integrity and EMI issues.

Authors:
Jason Chan, Amphenol TCS
Tom Cohen, Amphenol TCS
Brian Kirk, Amphenol TCS
Jose Paniagua, Amphenol TCS

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Common Mode Effects on Multigigabit-per-second Interconnects

Common Mode Effects on
Multigigabit-per-second Interconnects