PDN decoupling

Impact of PCB Via and Trace Geometry on the Effectiveness of Decoupling Capacitors, Part 2

Conducted emissions testing on custom PCBs shows how moving a decoupling capacitor farther from an IC can increase emissions across multiple frequency bands. Using CISPR 25 methods, this study compares capacitor placements and via topologies to reveal how distance and inductance shape PDN behavior.

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