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

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From: Lee Ritchey (leeritchey@earthlink.net)
Date: Mon Jan 24 2000 - 07:57:46 PST


You sure can. This will reduce the size of the capacitor formed by the power planes. This can cause higher frequency noise to increase.

david gil donate wrote:

> 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 ---------------------------- ----------------------
>
> ------------------------------------------------------------------------
>
> Part 1.2 Type: application/ms-tnef
> Encoding: base64

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