Thanks Dick - I can see what you meant now. > I am not an EMC expert, and I was only trying to offer what little > knowledge I could to help somebody. Please do not take offense.
I thought your advice was very good (though I don't pretend to be an expert either), but I've just realised we are probably thinking about the problem from two completely different viewpoints, as from memory your boards are multilayer whereas I have to use double layer. It's worth saying that if one has a problem as described in the OP, a four layer board would be highly preferable. Are you already using multi-layer, Anders? With such a board having multiple ground planes is probably pointless and may even make the problem worse. With a dual-layer board the power planes are likely to be very compromised and it then becomes necessary to design such that a noisy current doesn't end up funnelled past something sensitive. If you split the ground plane up with a view to helping you achieve this, then you should benefit, but if you just do it blindly thinking the mere act of doing so will solve the problem, expect trouble. Robert.
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