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Gigabit Ethernet interface from an EMC perspective

Gigabit Ethernet interface from an EMC perspective

By Wuerth Elektronik eiSos



Gigabit Ethernet has established itself as the standard in the networking in office and industrial environments. However, when designing a Gigabit Ethernet interface, questions often arise about the shield connection of the cable and the design of the front end, especially with regard to the ground connections. Often a 1-nF Y capacitor is suggested. However, the effect on the performance of the interface and the EMC behavior is not well documented. Würth Elektronik has therefore developed a reference design RD016 to be able to measure EMC aspects in detail. This whitepaper is based on this reference design and takes a detailed look at the EMC behavior of the Gigabit Ethernet interface with different shield connections and configurations.

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