[SI-LIST] Re: Signal crossing Split plane

Yuriy

Actually, these sorts of slot simulations are pretty meaningless.  Slots 
normally occur due to plane splits.  As a result, the either extend from 
one edge of a board to another edge, or when the plane is a square patch 
the slot is a closed loop around the periphery of the plane.  When this 
happens, it is quite interesting to simulate multiple signals crossing 
the slot.  There is a very nice slot resonance mode that occurs that is 
generally in the signal bandwidth (or at least 3rd harmonic) because of 
the length of the slot. This induces a signficant amount of ringing and 
crosstalk into neighboring traces.

scott

Scott McMorrow
Teraspeed Consulting Group LLC
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Yuriy Shlepnev wrote:
> Sunil,
>
> A simple example of how an electromagnetic solver can be used to investigate
> the effect of a slot or split in a reference plane is provided at
> http://www.simberian.com/AppNotes.php - see the topmost app note.
>
> Best regards,
> Yuriy
>
> Yuriy Shlepnev
> Simberian Inc.
> www.simberian.com
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
> Behalf Of sunil bharadwaz
> Sent: Sunday, November 18, 2007 1:26 AM
> To: SI LIST
> Subject: [SI-LIST] Signal crossing Split plane
>
> Hi ,
> I have few signals (@ 80 Mhz & 20 Mhz) crossing the split Power
> plane in the adjacent layer.
>
> The 20 Mhz signal is diffrerential signal.The 80 Mhz is a single
> ended signal.
>
> I want to analyse the affect on Signal Integrity of these two
> signals due to split plane.
>
> I believe one need to define his stack up (Including the 
> split) & then extract the layout to simulate.
>
> I'am not too sure if the prevalent SI tools have an option
> of creating split planes .
>
> Pls suggest me a right tool to carry out this.Also , i'am
> looking for a free tool to start with (even if the accuracy 
> is slightly limited).
>
> Thanks in Advance!!
>
> Regards
> Sunil.Bh
>
>        
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