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Problem with "Differential LPF with single out"

Vitalij Narozhnij
Prodigy 245 points

Dear All, I need to calculate the differential low-pass filter with a single output, the example schema:

I calculated the values ​​of the components in the circuit with FilterPro:

The problem is that the calculation in Filterpro I pointed Gain=1(2Vrms to 2Vrms), but the simulator shows a gain=2(2Vrms to 4Vrms) - probably because I had hoped to Filterpro "Fully Differential LPF", and gathered in the simulator "Diff with single out".

How do I calculate the "Differential LPF with single out"? Theoretically there is such a description in the patent , but I want to do calculations with the help of the program - is automated.


Warmest regards

                                 Vitalij