An example would be the above schematic with the frequent-mode choke and set of capacitors linked to an op-amp. The transfer purpose in the amplifier can then be modified by incorporating reactive factors into the feed-back loop, although Be careful for The soundness of this kind of active EMI filter https://music80863.blogchaat.com/31273517/the-ultimate-guide-to-emc-emi-filter-design-with-rb-common-mode-chokes