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Measuring Sub-milliOhm PDN Impedance

High speed and portable electronics are still shrinking while power integrity demands continue to require lower power distribution network (PDN) impedance.  Measuring sub-milliOhms is difficult.  Getting low noise, sub-milliOhm measurements in very small circuits is a bit more difficult. The result,150 u?, is impressive. This article explores the test techniques involved in making the measurement.

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