Avoid These Two Artifacts When Measuring SMPS Power Rails

Switch-mode power supplies (SMPS) are commonly used DC-to-DC converters in many electronic components. By their nature, they can generate a lot of radiated emissions. Unless care is taken, it is difficult to separate what is the actual voltage on the power rail and what is an artifact due to the way we probe the circuit. The project outlined here shows how to avoid EMI pick-up and cable reflection noise.

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Shielding and Filtering Are Not Independent of One Another

I have lost count of the number of times I have been asked to fix an EMC problem, only to find that a shielding box has been designed or purchased to provide XdB up to fMAX. Or a filter has been designed or purchased with a similar specification, but to reduce cost the filter has been mounted on a printed circuit board (PCB) inside the box, with a cable from it entering or exiting the box through a plain connector.

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Managing EMI and EMC at GHz and Beyond

Tools to Combat Radiated Emissions, for EMC Compliance and Performance Gains

New power-semiconductor technologies like SiC and GaN enable increased efficiency and higher switching frequencies, which allows smaller component sizes. But these gains come at the expense of greater radiated electromagnetic emissions, just as EMC regulations are getting tougher. How can engineers effectively minimize radiated EMI?

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IEEE EMC+SIPI 2018 Exhibition Summary

The 2018 IEEE EMC+SIPI event returned to Long Beach, CA after last visiting in 2011. The event continues to include Signal Integrity & Power Integrity (SIPI) as part of the conference, reflecting the EMC Society’s influence and focus on this critical topic of engineering design.

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