Two-stage (4 pole) LC input filters are tricky

I think it was a two-stage mains input filter from Schurter that got me thinking about CLCLC input filtering. And it all seemed so simple until I started reading around to understand it. I supposed I should have guessed, but the risk is that you end up with two gain peaks in the transfer function ...

This story continues at Two-stage (4 pole) LC input filters are tricky

Or just read more coverage at Electronics Weekly

from Electronics Weekly https://www.electronicsweekly.com/blogs/engineer-in-wonderland/two-stage-4-pole-lc-input-filters-tricky-2018-03/