![]() In this article, we'll go over some of the ways ferrites should not be used in a PCB, as well as how they actually operate in terms of their filtering behavior. ![]() Ferrite beads are sometimes applied for EMI in two ways in attempts to minimize EMI, but the designer ends up creating a new EMI problem if these components are not used correctly. You're probably reading this article on a laptop that uses a ferrite to filter out conducted EMI from the supply line.Ī problem begins to arise when you try to apply the same logic to other areas of a PCB. These components are basically filters, and they do perform a useful function on power cords in many electronics. ![]() One of these areas relating to EMC in PCB design is the use of ferrite beads. EMI and EMC can be a tricky subjects, and it's often tempting to mis-apply design guidelines to try and reduce EMI.
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