FreeLists / si-list / [SI-LIST] Re: power plane question

[steve weir <weirsi@xxxxxxxxxx>]

Ma, your first concern with -48V battery should be safety 
clearances.  Check the archives for discussion on the issue.

There are a number of guidelines to a good stack-up and there are at least 
several good discussions of the trade-offs in the archives.  See 
particularly recent discussions of balancing, where, why and how.

Steve
At 05:29 PM 5/3/2005 -0700, ma mu wrote:
>Hi ,
>
>I have a question for you.I have a board (2.5 gb/s).my
>stack up was :
>
>layer1:gnd
>layer2: gnd
>layer3:sig
>layer4:gnd
>layer5:sig
>layer6:gnd
>layer7:sig
>layer8:gnd
>layer9:sig
>layer10: gnd
>layer11: sig
>layer12: gnd
>
>  my  all +48 v was in all my signal layers. now i need
>to add 25 mil thickness. before it was 125 mil. now it
>is 145 mil and need to add two layers for +-48v. my
>question are:
>
>1.I am thinking I will add two gnd layers and put my
>+- 48v there. do you think it will be different to add
>th48v power plane to the gnd and to the signal
>layers.I am wondering if any signal integrity tools
>could analyze that and give me good report.
>
>
>2.where I should add this layers. in  bottom or top.if
>I will add this bottom I will add via stub. so I think
>top will be best to avoid via stub.  or should I need
>to concern anyother points. please advice me. thanks
>for your time.
>
>Regards
>ma
>
>
>
>
>
>--- Dorin <dorin.oprea@xxxxxxxxxxx> wrote:
> > I found any models just by searching the component
> > on the web.
> >
> > Good luck,
> > Dorin
> > layer1
> >
> >
> > Nikhil Patel wrote:
> >
> > > Hi al,
> > >
> > > Does anyone know where to find IBIS models for
> > IC's?
> > > Do I contact the manufacturer of the IC or are
> > they available on the net
> > > somewhere?
> > >
> > > Thanks
> > >
> > > Nikhil
> > >
> > >
> >
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