Characterization of high-frequency plane-to-plane coupling through cutout in multi-layer packages

Today's modeling methodologies for multi-layer power distribution systems do not take into account coupling between powedground plane pairs. If power/ground planes have cutout in them, substantial coupling may occur between plane pairs through the cutout. This coupling effect may increase the simulation error when high speed system which has cutout structures in their poweriground planes is to be analyzed. This paper presents analytical model which captures coupling effect through cutout in multi-layer powedground planes. Based on the model, the suppression method is discussed. According to the simulation results, the coupling noise through cutout can be successfully suppressed by placing the ports and cutouts at the proper locatious.

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