An illustration will be the above schematic with the prevalent-manner choke and pair of capacitors connected to an op-amp. The transfer function of the amplifier can then be altered by adding reactive components on the opinions loop, although watch out for The soundness of such a active EMI filter circuit. https://kite-surfboards11100.ourcodeblog.com/31375734/everything-about-emi-and-emc-filter-design