[SI-LIST] Re: PCB Gnd discontinuity on simulation software
- From: "Carrier, Patrick" <Patrick_Carrier@xxxxxxxxxx>
- To: steve weir <weirsi@xxxxxxxxxx>, "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Fri, 24 Feb 2012 18:12:08 +0000
Hi Ettore--
You cannot simulate the effects of traces crossing plane gaps and splits using
the standard HyperLynx SI.
You can, however, simulate this effect using HyperLynx 3D, which has been
recently integrated with HyperLynx SI:
http://www.mentor.com/products/pcb-system-design/news/mentor-announces-hyperlynx-functionality
As Steve points out, the result of such an analysis is usually the conclusion
that you shouldn't route traces across plane gaps and splits.
Mentor also has a tool that looks for reference plane discontinuities such as
this so that you can eliminate them from your design:
http://www.mentor.com/products/pcb-system-design/circuit-simulation/quiet-expert/
--Pat
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of steve weir
Sent: Friday, February 24, 2012 6:31 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: PCB Gnd discontinuity on simulation software
Ettore, your picture did not come through as the SI-list does not
support attachments.
I do not believe that present versions of Hyperlynx account for signals
crossing plane splits. If I am wrong, I am sure the Mentor guys will
chime in. In order to evaluate those kinds of effects accurately, a
full-wave solver is the best way to go. However, I will tell you right
now that you don't need a full wave tool to accurately predict that you
are setting yourself up for EMI headaches by introducing such a
discontinuity. You should really do what you can to maintain a
contiguous transmission path.
Steve.
On 2/24/2012 2:29 AM, ruscino wrote:
> Content-Type: text/plain; charset=ISO-8859-15; format=flowed
> Content-Transfer-Encoding: 7bit
> Hi all, in my circuit there are lvds nets that are on gnd shape
> (microstrip topology).
> These nets crossing also a circuit area where there is not the gnd shape.
> When I simulate this circuit on simulation software like Hyperlynx
> take the software into account this gnd discontinuity?
> See the picture in attach, please.
>
> Thanks a lot
> Ettore
>
>
>
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--
Steve Weir
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