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Evaluation of a product in terms of radiated emissions involves identifying the current return path. In a complex system multiple sources can contribute to the current at one place and frequency. Identifying the source of the current can be achieved by correlating the current to different sources. A multiphase buck converter uses multiple parallel buck converters having different switching times to...
DC/DC synchronous buck converters cause broadband emissions. A variety of methods are applied to analyze the root cause of the EMI. Time-domain voltage measurement and joint-time-frequency analysis allows to determine the location of the noise source. The near field scan reveals the current paths, and impedance measurement and 3D modeling can be used for further analysis of the noise source. A dual...
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