[SI-LIST] Re: Effect of Split Planes on Single Stripline Signals
- From: steve weir <weirsi@xxxxxxxxxx>
- To: wolfgang.maichen@xxxxxxxxxxxx
- Date: Thu, 10 Jun 2010 00:05:31 -0700
wolfgang, DDR3 clock and data strobes are differential. All other
signals are single-ended. Walter will still probably be OK SI-wise.
Best Regards,
Steve.
wolfgang.maichen@xxxxxxxxxxxx wrote:
> Hello Walter,
> based on past simulations and experiments of similar cases my educated
> guess is that with the given dimensions, the fact that the line is
> differential and the closer reference plane does not have a split, as well
> as the relatively low bandwidth (what are your rise times? I'd guess
> around 200ps?) reflection will be minimal (meaning of the order of 1-2% or
> less). But I would highly recommend running your own simulations first,
> before manufacturing the board. One tool that can handle your structure
> (and which I used myself in my simulations) would be Sonnet Lite. It's
> free so you can't lose anything (other than a few hours of your time).
> Make sure to take advantage of your structure's symmetry (Sonnet has a
> checkbox to tell the solver to assume a symmetric structure) as this
> reduces memory requirements and thus either speeds up the calculation or
> allows you to simulate with greater precision (finer subdivisions).
> Since the Lite version only allows two metal layers use top and box cover
> as additional layers - that way you can simulate all four layers of your
> structure (solid plane, signal layer, broken plane, adjacent solid plane).
>
> Disclaimer - I am in no way affiliated with Sonnet, apart from using
> Sonnet Lite myself.
>
> Wolfgang
>
>
>
>
>
>
> "Walter" <waltinaustin@xxxxxxxxx>
> Sent by: si-list-bounce@xxxxxxxxxxxxx
> 06/09/2010 02:00 PM
>
> To
> si-list@xxxxxxxxxxxxx
> cc
>
> Subject
> [SI-LIST] Effect of Split Planes on Single Stripline Signals
>
>
>
>
>
>
> I have an application were I am contemplating routing signals across
> splits in a plane. Everyone know that this is a big no no for high speed
> signals. But in this case, it's a asymmetric single stripline. The traces
> are 12 mils from a split plane and 3mils from a solid plane. Can I expect
> a measurable effect on my DDR3 1600 signals? I would like to simulate this
> with a 3d solver but I don't have access to one.
>
> Regards,
> Walter Haskell
> Polycom. Inc.
>
>
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--
Steve Weir
IPBLOX, LLC
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