49 Four Layer PCB Power Integrity Examine S21 for board with and without Decoupling Capacitors Compare Measurement data to SIwave data Four 0.000138 copper layers Three 0.04 FR-4 layers Ports and Capacitors between layers 2 and 4 Setup for 25 Decaps in SIwave Measured SIwave Measured SIwave No Caps w/ Caps
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