[SI-LIST] Re: Microstrip vs. Stripline
- From: steve weir <weirsi@xxxxxxxxxx>
- To: Ravinder.Ajmani@xxxxxxxxxxxxxx
- Date: Fri, 17 Sep 2010 16:22:50 -0700
Ravinder, you would be trading one set of not specifically constrained
problems for the problems that you have. What you really need to do is
understand what is causing the discontinuities that you have, and what
your options are. If you don't have the tools you need, consider
contracting with someone who does.
Steve.
Ravinder.Ajmani@xxxxxxxxxxxxxx wrote:
> Hi Experts,
> I have 2.5" long interconnects running at 6 Gbps. Currently I am using
> Microstrip transmission lines, routed over 3.5 mil Prepreg, because I am
> able to route them on the Top layer without any vias. However TDR shows
> impedance discontinuities perhaps caused by non-uniform plating and solder
> mask, and weave effect.
>
> I would like to know if a dual Stripline transmission line will be better
> although I will have to use a pair of vias on each trace. My card
> thickness is 0.8 mm and back-drilling of the vias is not an option. I
> also have to stay with standard FR-4 for cost reasons. I have tried
> simulating both options and the simulation supports the Microstrip
> approach, but I am not able to simulate the effects of non-uniform plating
> and solder mask or weave effect.
>
> Any suggestions.
>
> Thanks.
>
> Regards,
> Ravinder Ajmani
> Server PCB Development
> Hitachi Global Storage Technologies
>
>
> Email: Ravinder.Ajmani@xxxxxxxxxxxxxx
>
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--
Steve Weir
IPBLOX, LLC
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