Troubleshooting EMI Failures on Power Delivery Networks

This technical report outlines the process for troubleshooting electromagnetic interference (EMI) failures in power delivery networks using oscilloscopes and near-field probes. It begins with an initial far-field measurement to identify problem frequencies that exceed specified power levels. The report details a systematic approach, including acquiring a peak list of frequencies, spatially locating emissions, and mitigating identified emissions. It emphasizes the importance of real-time spectrum analyzers and oscilloscopes in detecting weak narrowband signals amidst broadband noise. The document also discusses the correlation between near-field and far-field measurements, highlighting the limitations of amplitude measurements in near-field setups. Additionally, it addresses the technical requirements for effective EMI debugging, such as high sensitivity and proper sampling rates. The report concludes with a recommendation for retesting in a compliance lab to ensure that emissions do not exceed industry standards, thus facilitating successful compliance with regulatory requirements.