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EMI: What it Is, Where it Comes From, and How to Control It
July 10, 2013 |Estimated reading time: Less than a minute
There seems to be a great deal of mystery surrounding EMI and EMC. I have a shelf full of books on the subject. Some of them are technically very good and at least three of them are so full of misinformation that their followers are more likely to have EMI problems than if they did nothing. Of the books that are technically very good, all describe at great length how to measure near field and far field emissions and how to calibrate measurement setups.
However, none of them really gets down to the basics of where EMI comes from, what it really is, why it is an issue and what to do about it.
Electromagnetic interference (EMI) is electromagnetic energy that escapes one product and interferes with another. This can happen in two ways. First, electromagnetic energy can be radiated into space because there is an accidental antenna extending from the product. Second, the energy can be conducted out of the power lines of the product and into the power terminals of another product. Read the full article here.Editor's Note: This article originally appeared in the April 2013 issue of The PCB Design Magazine.