Conducted emission profile spectra analysis assessment of impulse transients

This paper discusses an approach to analyzing and assessing the frequency spectra of conducted emission profiles due to impulse transients caused by electrically fast transitions. The method discussed is to gauge such a transient's ability to create sufficient energy, high enough in frequency profile, to excite a circuit's resonance. This paper details aspects of the time to frequency domain transformation, key parameters of the circuit that influence this relationship as they relate to CE testing. Discussion of a novel approach is included to allow pre-compliance assessment using the impulse impedance for parallel and series capacitive coupled waveforms. Lastly detailed design considerations and guidelines are given.