[SI-LIST] Re: PCB trade off

Joel you can choose the free field solver of your choice to get a 
geometry for either edge or broadside coupled differential pair.  
Alternately for $20. you can rent time on Polar and get a pretty precise 
result. Wider traces have less skin loss, and can be etched more 
accurately.  They take up more space in the X-Y plane, require greater 
cavity thicknesses, and require more space to hold down crosstalk.  The 
general idea is only go as wide as you need to.

Steve.
Joel Amzallag wrote:
> Hi,
> I am looking for rules off thumb on PCB :
> - What is a practical geometry for a 100 ohm, differential (coupled) 
> stripline in an FR-4 circuit board?
> - What are the tradeoffs between trace width and dielectric thickness?
>
>
> Thanks,
> Joel.
>
>        
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