what is this spike...?

MisterBill2

Joined Jan 23, 2018
27,558
you mean ringing on the output? I am sure I can look into this next week as today I was in the EMC chamber all week.

I think a 4 layer board will further improve things but I appreciate the guidance
Yes, ringing or even just a few bumps in the trace. I learned that it is important to look at waveforms in some serious magnification in case there is stuff that does not show up at a slower sweep speed.
 
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