Part one of this article explained EMC basic strategies and provided useful hints.
While it is merely a nuisance to experience radio interference, it is definitely a serious matter if an ABS, stability control, or airbag suffers a malfunction because a vehicle passes a TV tower too closely. Thus, mastering EMC is a basic requirement for automotive electronics designers. Part two of this article outlines methods to suppress high-frequency resonance.
Read the complete article here, which discusses equivalent circuit models of the capacitor, mulitple capacitors for broadband decoupling, and board layout considerations, courtesy of Automotive Designline Europe.
The article is certainly correct about the need to consider the entire "system" in order to understand what a filter circuit is really doing. Of course, the real challenge is often in meeting cost constraints while still providing adequate protection. That is why designing for EMC must start at the very beginning, even with the selection of active devices, in order to assure that there will be no unfortunate surprises later on. This would also include a careful examination of production variables, including the liberties taken by PCB layout designers.
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