An illustration could be the above schematic with the frequent-manner choke and set of capacitors linked to an op-amp. The transfer function with the amplifier can then be adjusted by including reactive factors to the feed-back loop, Whilst watch out for The steadiness of this sort of active EMI filter https://marcoqkbqe.blogthisbiz.com/37650550/the-smart-trick-of-emi-rfi-filter-that-nobody-is-discussing