[SI-LIST] Re: Microstrip vs. Stripline
- From: Ravinder.Ajmani@xxxxxxxxxxxxxx
- To: steve weir <weirsi@xxxxxxxxxx>
- Date: Fri, 17 Sep 2010 18:32:21 -0700
Hi Steve,
Thanks for your response. I do not have any issue with the current
design. I am only checking the current design to find out what will I
need to make it run at higher data rate (10 - 12 Gbps). As you have
suggested, I need to do more investigation to determine the cause for
discontinuities.
Regards,
Ravinder Ajmani
Server PCB Development
Hitachi Global Storage Technologies
Email: Ravinder.Ajmani@xxxxxxxxxxxxxx
steve weir <weirsi@xxxxxxxxxx>
Sent by: si-list-bounce@xxxxxxxxxxxxx
09/17/2010 04:22 PM
To
Ravinder.Ajmani@xxxxxxxxxxxxxx
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si-list@xxxxxxxxxxxxx
Subject
[SI-LIST] Re: Microstrip vs. Stripline
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
150 N. Center St. #211
Reno, NV 89501
www.ipblox.com
(775) 299-4236 Business
(866) 675-4630 Toll-free
(707) 780-1951 Fax
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