Hi John,
Since different simulator yield different results, you
might want to contact the fab shop that you plan to
use and have them simulate that for you. This way you
can get an idea on what impedance you will be actually
get.
Ted
--- John Parsons <[log in to unmask]> wrote:
> Greetings all,
>
> I could use a little help here. I don't have an
> impedance solver at hand
> and I have a customer looking for a suggested build
> for a 10 and 12 layer
> board with signal traces running at 100ohm (single
> ended and differential).
> They will have signal traces at 4-6mil's (I am using
> 5mil for my rough
> calculations) but I can't see how to do this with
> regular FR-4 laminate (Er
> 4.2). Has anyone build/designed boards with this
> requirement? Can you give
> me some clues as to lay-up or laminate spec's that
> could save me some leg
> work?
>
> Stack is as follows; 1/2oz base copper all layers
> 10 layer,
> Sig,Plane,Sig,Plane,Sig,Sig,Plane,Sig,Plane,Sig
> 12 layer,
>
Sig,Plane,Sig,Sig,Plane,Sig,Sig,Plane,Sig,Sig,Plane,Sig
>
> Regards
> John Parsons
>
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