EMI Bites

No wonder EMC seems like black magic. You've likely been taught the wrong analogies and fundamentals.

The issue isn't a lack of skills, it's knowing how to apply them effectively.

When your Printed Circuit Board (PCB) fails EMC tests, it's rarely one big problem. Instead, it's the accumulation of many small, poor design choices.

Schematics often oversimplify circuits for intuition, but when imported directly into PCB layouts, these simplifications become the root of EMC failures.

The real gap?

EMI Bites: One of the ways to deal with Electrostatic Discharge? Think about diverting the energy.

The problem with ESD is that if you focus on electron flow instead of energy flow, and how the fields store, couple, and carry the energy, you are going to face issues that seem like Black Magic.

So, how can we handle this?

Consider the ESD event as a high-frequency pulse.

One effective approach is to use transient voltage suppressors (TVS diodes) to shunt the ESD energy away from sensitive components.

EMI Bites: How to Reduce Crosstalk in Densely Packed PCB Designs?

The problem is that sometimes we might not have enough space to increase the distance between signal traces, but we still need to reduce crosstalk.

So, how can we tackle this?

Stackup.

Yes, to minimize the effect of fringe fields spreading outward from the signal traces, we can reduce the distance between the signal trace and the return/reference plane.

Crosstalk occurs when electromagnetic fields from one signal trace couple into a nearby trace, inducing unwanted noise.

But why does this happen at a fundamental level?

Every signal is electromagnetic energy:

- Electric fields between the trace and its return & reference path,

- Magnetic fields looping around the conductors.