12 Nov
2005
12 Nov
'05
8:46 p.m.
The circuit boards are multi-layer and from what I can
see, looking
at one side you can see writing on the layer below that says either
+5 plane or ground plane depending on which side you are looking at.
I have never seen this before, the buried ground and +5 buss, is this
normal?
Yes. They often aren't marked as such, but when the board has enough
layers to do it, having dedicated ground and power planes (which are
mostly copper, rather than mostly space the way other planes typically
are) is usual. I'm not enough of a PCB design person to explain why
beyond waving my hands and talking about how the capacitance gives
better transient response.
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