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PCB power-gnd impedance measurement

Question asked by on May 6, 2008
Dear all,

We are using E8362B to measure PCB power-gnd impedance. Application note 5989-5935 is as a reference. I don't understand the second-order analysis. Why V1 is equal to 1/2 Vsource, and doesn't Zdut affect the V1?

Thank you for your help.