One faces a difficult situation in EMI debugging if multiple sources radiate at the same frequency, especially, if little details on the EUT are provided. In this paper, we apply and compare a set of signal analysis techniques for identifying radiated emission sources. First, theoretical background of Joint Time-Frequency Analysis (JTFA) is given and an algorithm using Short-Term Fast Fourier Transform (STFFT) approach is applied for the data analysis. STFFT analysis provides an exclusive insight into time-dependent emission processes. Also, narrow span and zero span spectrum analysis are discussed. Special emphasis is given on signals sideband characteristics.
Z. Li and D. Pommerenke, "EMI-debugging of Complex Systems using Different Time, Modulation, STFFT and Frequency Domain Signal Analysis Techniques," Proceedings of the 2005 International Symposium on Electromagnetic Compatibility, 2005, Institute of Electrical and Electronics Engineers (IEEE), Jan 2005.
The definitive version is available at http://dx.doi.org/10.1109/ISEMC.2005.1513586
2005 International Symposium on Electromagnetic Compatibility, 2005
Electrical and Computer Engineering
Keywords and Phrases
Dithered Clock; Fast Fourier Transform (FFT); Sidebands; Zero-Span
Article - Conference proceedings
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