[Solved] Common Mode Noise filtering for Diff Mode Circuit

Gokhan Sahin Asks: Common Mode Noise filtering for Diff Mode Circuit
I have a circuit that has only two pins and there is no earth ground. However, I have to test it for BCI and design a common mode filter with diff mode. Designing diff mode filter is simple but common mode without earth ground is very complicated, or it is for me. The circuit has a buck converter and the frequency is 250KHz. What kind of filter should I design?

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simulate this circuit – Schematic created using CircuitLab

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