Gigabit Ethernet interface from an EMC perspective
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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