[SI-LIST] Re: PCB trade off
- From: steve weir <weirsi@xxxxxxxxxx>
- To: loeljem@xxxxxxxxx
- Date: Mon, 17 Dec 2007 19:59:22 -0800
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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