ANALYSIS TYPE / 04
cavity resonance · plane modes · standing waves
Overview
Identifying power and ground plane cavity resonances that cause high-impedance peaks in the PDN at specific frequencies — analysing standing wave patterns and recommending anti-pad geometry, plane splits, or additional damping to suppress resonances.
Deliverables
Key Aspects
Computing resonant modes of power and ground plane pairs as parallel-plate resonant structures, identifying frequencies where the PDN exhibits high-impedance resonant behaviour.
Mapping the spatial distribution of resonant mode standing waves across the PCB surface to identify high-noise-sensitivity regions for critical IC placement.
Evaluating how anti-pads, cutouts, and plane splits modify cavity resonance frequencies and Q-factors, and assessing their PDN impedance impact.
Recommending embedded capacitors, EBG structures, or ferrite material strategies to damp cavity resonances without significantly increasing PDN impedance at lower frequencies.
Connect with our power integrity team to discuss the right approach for your application.
