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

 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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