One critical point that needs to be deemed is what steps to choose when a design is not really passing EMC testing. When I've been requested by a client to transform one in their designs as a result of failed EMC testing, the answer won't usually call for filtering circuits. https://callgirlsinelectronicscit82503.aioblogs.com/84645342/the-ultimate-guide-to-emc-emi-filter-design-with-rb-common-mode-chokes