ANALYSIS TYPE / 06
return current · split planes · routing for EMC
Overview
Reviewing and optimising PCB layout for EMC compliance — analysing return current paths, plane split crossings, high-frequency loop areas, and decoupling placement to reduce emissions and improve immunity at the board level.
Deliverables
Key Aspects
Mapping return current distribution under high-speed signal traces to identify where return paths are forced to detour through splits, anti-pads, or adjacent planes — creating emission-inducing loop areas.
Identifying large current loop areas formed by power and signal routing, and recommending trace routing, layer assignment, and decoupling placement changes to minimise loop area at critical frequencies.
Evaluating the EMC impact of plane splits, moats, and routing-across-cuts on high-speed interface traces, and recommending layout changes or stitching capacitors to maintain return current continuity.
Reviewing placement of oscillators, switching regulators, filters, and connectors relative to sensitive circuits and PCB boundary to minimise intra-board coupling and external radiation.
Connect with our EMI/EMC engineering team to discuss the right approach for your application.
