[SI-LIST] Re: PCB Gnd discontinuity on simulation software

Oh Ettore, forget the SI analysis stuff and go ahead and route your high-speed 
traces over all the gaps you want. It will help keep us EMC consultants fully 
employed! :-) Ha!
Cheers, Ken
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On Feb 24, 2012, at 11:12 AM, Carrier, Patrick wrote:

> 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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