[SI-LIST] Re: 10G Differential routing trace width

It depends on what interconnect spec. you are trying to meet ...
10-15 in. of 6 mil trace on FR4 would be way too much for XFI for 
example but perfectly ok for KR.

Thanks,
Vinu

Filion, Marc-Andre wrote:
> Hi,
> I've got an easy Friday question. When it's time to design board with 
> multi-gigabit (> 5Gb) differential signal, we always get lost into a 
> discussion with CAD guys. We want more trace width to reduce loss and they 
> want more real-estate to fit everything. In that case, increasing dielectric 
> thickness is not an option because it will ruin the rest of the layer 
> trace-2-trace clearance. In the end, we're stuck with a 6 mils trace that 
> will handle a 10G signal. We know, from previous design, that it's working, 
> but I'm not sure if this is good practice. We have to go into 10 ~ 15 inch of 
> routing with interconnect. 
>
>  
>
> Is there a rule of thumbs about trace width and signal speed? 
>
> When Skin effect become a problematic issue?  
>
>  
>
> Many thanks,
>
>  
>
> Marc-André Filion
>
>  
>
>
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