[SI-LIST] Re: Prepreg dielectric constant and thickness: what actual values to use?

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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