What would be the reason for leaving off the soldermask on a 1GHz analogue diff. pair ?pic.twitter.com/wMoWaGCbMy
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This appears to be the answer from what I've read. You can control for it in theory, but in practice soldermask thickness isn't tightly controlled. Apparently soldermask is also fairly absorbent, which can cause problems in humid environments when compared to an ENIG coating.
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