Within a functional EMC simulation for automotive component tests, the cable harness shows significant influence to the radiated emissions. Detailed harness models can be generated with the help of a full wave simulation within the frequency range. However, the calculation process is a very time intensive task, especially if the complete setup in respect to CISPR25 for radiated emissions is considered. With the help of one simplified simulation and auxiliary calibration measurements, it is possible to speed up the model generation process of the harness and to consider the ambient measurement structures. The method is presented for different harness structures and tested for assemblies with up to ten wires.
The filter development process, to reduce occurring conducted emissions, is still an unsolved problem within EMC considerations, due to the filter attenuation depends on the impedance values of the device under test. The paper presents a method how to characterize arbitrary active applications within the frequency domain. The evaluated noise sources are described as Y or Z-matrices with additional active sources in respect to Thevenin's law. Through a translation from the time into the frequency domain even circuits including non-linear elements can be considered. The method is presented for the example of a power stage circuit and it is considered how to translate the technique into measurements.
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