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Answer by Justme for Strange comb spectrum found during EMI precompliance
Let's do some math that explains what it could be, but it might be something else too.So you have a 40 kHz switch mode buck converter, which has a period of 25 us.The buck converter steps 24V down to...
View ArticleAnswer by Colin for Strange comb spectrum found during EMI precompliance
I see this behavior a lot when I'm troubleshooting switching power controllers. This behavior is known as diode emulation, which behaves as a "safe mode" for switching power supplies.During startup, if...
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Strange comb spectrum found during EMI precompliance
During near field testing I encountered this thing I've never seen neither on the wild nor on the book. The board has an STM32F107 with an 8MHz crystal and no ferrites or choke whatsoever (I'm already...
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