Why Do Most PCBs Fail EMC Tests?
Sometimes it is because of simple details that are not addressed.
For instance, parasitic inductance creates voltage drops in return paths.
These drops drive common-mode currents across conductors.
Cables radiate these currents, acting as antennas.
Just microamps can cause EMC test failures.
Add at least one via to each ‘GND’ pad, instead of sharing them.
This reduces inductance to the Return and Reference Plane (RRP).
Lower impedance minimizes voltage drops.
This decreases common-mode currents significantly.
A simple fix can lead to bigger results.
-Dario
P.S. Want to master EMI control and pass EMC?
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