It is easy enough to imagine a situation when wrong layout, bad filtering, and strong electromagnetic field radiated by inductor of a switching converter can disturb the analog part of device to operate correctly. For example, power supply of oscilloscope. However, I never met a systematic study of EMI in mixed-signal systems or ICs. Does such a study make sense? Could EMI be estimated (modeled) in the regular simulators like SPICE or Simulink? It is naturally to assume that some hybrid approach will be needed. I mean simulators of 3D electro-magnetic fields based on finite-elements method.

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