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Would noise from MLCCs be cancelled out if adjacent capacitors had different pol
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wraper:

--- Quote from: demute on December 05, 2022, 12:02:24 pm ---That's interesting. You mean that they can be very different while they still are class II MLCC:s? The capacitors I currently use are 10 uF / 100 V in 1210 package, or 10 uF / 63 V in 1206 package. So given the capacitance, I don't have the luxury to go for C0G capacitors for example.

--- End quote ---
Class 2 is a very vague specification with subclasses within it. It does not specify actual materials used. All it specifies is maximum capacitance change within temperature range. But your issue is more related to piezoelectric effect and effective capacitance/voltage dependence which is not specified in this classification. Not to say mechanical resonance plays a role, so it's totally possible that worse capacitors will be quieter at certain frequencies that those which are overall better.
jongeske:
Hi, this is my first post so if I did this wrong I apologize:
I was struggling with MLCC noise on a charge pump circuit for an audio application.  I got the noise down about 10dB by going to the minimal capacitance value the IC needed.  I had read that the capacity of the cap was a factor in the number of layers and more layers tended to be louder.  The rest of the improvement was then made using new ZRA and ZRB caps from Murata which have an integrated interposer.  With these two changes, all the noise was gone (audible and on the spectrum analyzer).
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