EMI Avoidance Design Tips

We have compiled some tips that can help you do the right things when it comes to EMI / EMC testing.

Leave enough space on the PCB for EMI suppression devices. With good EMI design practices, your circuit board can be very quiet. But to be on the safe side, leave extra space in the board for the attachments of filters and coils. It's also a good idea to add extra pads to the board in case a shunt capacitor is needed.

The "second origin" part is assumed to have the same spectral properties as the original. This is especially important for active components such as DC-DC converters. Fit, form, and function may be the same, but EMI noise can be significant. Before investing in a large stock of these extra parts, attach one to your design and take it for a test drive.

Design printed circuit board when it is used for ground and power aircraft. And if possible, use multiple ground planes. Not only are they useful in containing high frequency traces, they also help reduce the loop domains of signal and power traces, which are an important contributor to EMI emissions. Generally, when it comes to floor scars, more copper is better.

When its use is wiring and cable ties, the insertion of lines in a box, EMI pickup in I / O cables makes a significant contribution to the overall radiated noise. Route cables along the edges of the enclosure and away from high frequency components and switching power supplies.

Do not allow dyed seams on the frame or box. This is especially important if one of your EMI strategies involves restrictions. Rivets and screws generally do not provide sufficient electrical conductivity between frame parts. Are matching parts masked before painting or powder coating? For additional thrust, make sure each coupling piece meets a flange.

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