Design & SimulationMarch 5, 2020

SIMULIA Whitepaper: Designing Automotive Ethernet with Electromagnetic Simulation

This post was originally published on January 22, 2019. The number of…
Avatar Matthias Troscher

This post was originally published on January 22, 2019.

The number of electronic components in the average car is increasing and smart vehicles are a major driver of growth in the automotive market. Designing an elec­tronic system in isolation always poses a challenge to the electronic engineer, but connecting multiple sys­tems creates additional challenges. Communication between these electronic systems based on high-performance standards is key for fast and proper data transfer.

For example, modern electronic systems like infotainment and advanced driver-assis­tance systems (ADAS) require very high bandwidth for video streaming. The traditional vehicle bus protocols like Controller Area Network (CAN) are not able to provide enough bandwidth. Automotive Ethernet is one of the leading proposals for an upgrade.

BroadR-Reach® is a point-to-point Ethernet Physical Layer standard for automotive applications, allowing full-duplex communication between two devices over an unshielded twisted wire pair at 100 Mb/s, with plans to increase it up to 1000 Mb/s. This high bitrate means that the system is susceptible to high-frequency interference and, at frequencies above 1 MHz, the BroadR-Reach automotive Ethernet carries a much higher spectral content than the CAN bus. Designers need to be aware of this and apply the proper techniques to mitigate emissions at these higher frequencies. Making BroadR-Reach Ethernet compliant with automotive EMC requirements is a challenging task.

Traditionally, EMC testing has been heavily reliant on measurements with physical prototypes, which can lead to multiple troubleshooting iterations with high corrective costs and a delayed time to market. Virtual prototyping with electromagnetic simulation allows potential interference issues to be identified earlier in the design process, potentially saving time and money. The examples presented in this whitepaper are all based on the coupling of the full wave 3D model to a circuit simulation.

Read the full whitepaper here.

The test PCB, showing the IC, components, traces and connector.

Want to find out more? Register for free membership and check out our eSeminars on automotive applications:

SIMULIA offers an advanced simulation product portfolio, including AbaqusIsightfe-safeToscaSimpoe-MoldSIMPACK, CST Studio Suite, XFlow, PowerFLOW and more. The SIMULIA Learning Community is the place to find the latest resources for SIMULIA software and to collaborate with other users. The key that unlocks the door of innovative thinking and knowledge building, the SIMULIA Learning Community provides you with the tools you need to expand your knowledge, whenever and wherever.

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