What type of filter should I use ?

[Sharp]

Hi guys

I need an advice to suppress my 12V charting noise on my motor bike. I’m not at all experienced in filter design.

I’m working on a project where the charting noise limit needs to be suppressed to maximum 200 mV PP.

As you can see on the pictures the MC has an extreme noise level (Chanel 1 - the yellow one). I have done a preliminary test with a basic 2nd order passive low pass filter (Chanel 2 - the blue one) and as you can see it is a bad approach.

What will you recommend my approach should be -  A Murata fixed filter or design one like the Butterworth, Bessel or …

I hope one of you experienced guys can help



Br
Sharp