Capacity extraction in physical equivalent networks

Jan Hansen, Carsten Potratz

Research output: Chapter in Book/Report/Conference proceedingConference paperpeer-review


Physical Equivalent Circuits of electronic devices are very useful for EMC root-cause analysis, because they boil down complex coupling paths into rather simple circuit schematics, displaying only relevant inductive and capacitive structures. However, their derivation can be extremely time-consuming and requires thorough understanding of the device under test. Recently, a method was proposed to derive such a circuit with the aid of a computer. Whereas the design of an inductive network is relatively straight forward, correct placement of only the relevant capacities is difficult. In frequency range of interest, there are often too few resonances to determine capacitances uniquely, revealing that capacity placement has typical properties of an ill-posed problem. Engineering intuition states that often, only few capacitances dominate the root-causes of an EMC spectrum. We present a regularization method that allows to quickly determine the C matrix with fewest number of entries via an iterative least squares minimization. We are thus able to compute a unique physically meaningful capacitance matrix of a physical equivalent circuit.
Original languageEnglish
Title of host publication2015 IEEE International Symposium on Electromagnetic Compatibility (EMC)
Publication statusPublished - 16 Aug 2015
Externally publishedYes
EventIEEE International Symposium on Electromagnetic Compatibility: EMC 2015 - Dresden, Germany
Duration: 16 Aug 201522 Aug 2015


ConferenceIEEE International Symposium on Electromagnetic Compatibility

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