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

 Thanks to all for your useful replies. We can go on now. :)
Marc

Scott McMorrow wrote: 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
signaledges, 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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