I'm trying to make a 1MegHz CM filter using a common mode choke and some capacitors but I have a very high gain at lower frequencies instead of attenuation i.e high Q factor. A simulation shows the issue:
The filter is meant to filter 1MegHz or higher freq. CM noise from a DC output of a supply. But my fear is to damage the load because of a possible high gain at lower frequencies. How can I model it more realistic? I tried to add 1 ohm series resistors but it didn't help much. How can the Q factor be reduced in reality?
For the choke I use two of this ferrite core on top of each other with tens of turns. And here is the the actual photo:
Solution to the issue from the answer of @Andy aka: