Peak output impedance of LC filter of Figure 1 is: (2) Middlebrook shows that the input impedance of a switching power supply is minimum at the resonant frequency of the output averaging filter and ...

If the input filter also includes inductors (LC), the stability must be checked: the input filter changes the dynamics of the regulator. The output impedance may become large over some frequency range ...

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 ...

A VM LC filter behavior is shown in Figure 3 and its simulation result in Figure 4. The difference between the red and blue traces is the capacitance ESR value, 1 mΩ vs. 100 mΩ. 3.