Emc: For Printed Circuit Boards

Your next PCB will emit noise. The question is: will you design it to, or will you tame it? Design for compatibility. The spectrum is a shared resource.

Keep high-speed traces at least 5x the trace width away from the board edge. Stitch a "guard ring" of vias around the perimeter. Stack-up Strategy: The Foundation of EMC Your layer stack-up is not a cost negotiation; it is an EMC decision. For a 4-layer board, the classic "signal - GND - power - signal" stack-up is excellent. The critical detail: the power and ground planes must be tightly coupled (thin dielectric, < 5 mils) to create a high-frequency decoupling capacitor across the entire board. emc for printed circuit boards

A 10 nF or 100 nF cap placed as close as possible to the power pin, with a wide, short trace and two vias (one for power, one for ground) to minimize loop inductance. Your next PCB will emit noise