[SI-LIST] Re: Prepreg dielectric constant and thickness: what actual values to use?
- From: Scott McMorrow <scott@xxxxxxxxxxxxx>
- To: Marc Battyani <marc.battyani@xxxxxxxxxxxxxxxxxx>
- Date: Thu, 21 May 2009 09:52:55 -0400
Marc
I misread the second question. (not enough coffee yet!) You will use
the 1 GHz values, since you are primarily concerned with the behavior of
the signal edges, which are in the 1 GHz region and above.
regards,
Scott
Marc Battyani wrote:
> Hi,
> When you specify a stackup the thicknesses of the cores are well defined but
> the for the prepreg layers it's less obvious. So when using one or several
> prepreg sheets do you just use and add the basic thicknesses or is there a
> correction to make?
>
> For the dielectric constant of those materials, when you have 4.3-4.5 @ 1MHz
> and 3.8-4.0 @ 1GHz what value should we use as a basis for the simulations
> for 125MHz HSTL or 200MHz SSTL for instance?
>
> Thanks,
>
> Marc
>
>
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