[SI-LIST] : Distance between Power and Ground planes

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From: david gil donate (dgd@dimat.es)
Date: Mon Jan 24 2000 - 01:57:49 PST


Hi,
We have some problems with signal impedances between two PCB boards. We want to rebuild the board with different layer heights to fit impedances. I have to preserve the board height. Then when I try to reduce the distance between the sig int 1 and power plane I add distance between ground and power plane. My question is: Can I have some SI or EMI problems if I change the distance between Power and Ground planes to 1.42 mm from 0.2 mm?

                                Current PCB New PCB
sig top ----------------------------- -----------------------
                                0.36 0.2
sig int 1 ----------------------------- -----------------------
                                0.8 0.35
grd ----------------------------- -----------------------
                                0.2 1.42
pwr ----------------------------- -----------------------
                                0.8 0.35
sig int 2 ----------------------------- -----------------------
                                0.36 0.2
sig bottom ---------------------------- ----------------------



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