Trends of EMC standards for automotive network devices and communication quality of ethernet in relation to parameters of pulse disturbances

Recently, a series of EMC standards for bus transceiver ICs, IEC 62228, which focuses on automotive applications, has been greatly attracting attention. In particular, the importance of immunity characteristics is increasing to ensure safety and reliability. In this article, the latest trends for IEC 62228 series are introduced; particularly, automotive Ethernet is focused on among automotive network devices, and the importance of using pulse disturbance in immunity testing for Ethernet is considered. The influence of pulse disturbance on the communication quality of 100BASE-TX was evaluated experimentally, and the relationship between the threshold level of Ethernet and pulse disturbance affecting communication quality was revealed when the amplitude and width of pulse disturbance were changed. In particular, disturbance with a pulse width of about the same as 1-bit time degraded communication quality the most.