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describes some recent Intel sponsored research efforts that investigate EMI to on- boardFMradio receivers. Several different design ap-proacheswere tested, using both two layer and multilayer circuit boards. The test program was based on an ABS (anti-lock braking system) control module that uses the Intel 80C196KRmicrocontroller. The results and recommended "low noise" design concepts, however, apply to any microcontroller design used in vehicular applications.

Normally, this is nota problem for microcontroller based systems, since at 50 or 60 Hz, electromagnetic field coupling is not very efficient. Nevertheless, very low analog level circuits can be affected by''stray'' magnetic and electric fields. Thus, power line field re- quirementsare usually imposed on vehicular systems to make sure no upsets occur due to this threat.

For example, at Intel we've designed in the capability to turn off certain high speed control lines when not needed. We've redesigned clock drivers, and we've incorporated high frequency power and grounding schemes right on the silicon. We are working with a Society of Automotive Engineers Task Force to develop methods to measure and control EMI at the chip level. Our research into these areas continues. But while these efforts help, we can't do it all, and the real battle against EMI must still be waged at the circuit and module stage.

EMI is a necessary part of any vehicular electronic design, and building in EMI suppression and hardness at the PCB level is very sensible engineering. Not only will you end up with an "EMI-proof" design, but you'll likely have a more reliable design as well.

Source: ecee.colorado.edu

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