[SI-LIST] Re: Signal crossing Split plane

Scott,

To add to the real life scenario, a signal is often placed between solid
plane on one side, and crossing a split as you described on the other.
The distance to these surrounding return planes may be same or
different, this affects the distribution of return currents at the
crossing area.=20

Boris Shusterman
EMC Corp.

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Scott McMorrow
Sent: Sunday, November 18, 2007 3:29 PM
To: shlepnev@xxxxxxxxxxxxx
Cc: sunil_bharadwaz@xxxxxxxxx; 'SI LIST'
Subject: [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=20
happens, it is quite interesting to simulate multiple signals crossing=20
the slot.  There is a very nice slot resonance mode that occurs that is=20
generally in the signal bandwidth (or at least 3rd harmonic) because of=20
the length of the slot. This induces a signficant amount of ringing and=20
crosstalk into neighboring traces.

scott

Scott McMorrow
Teraspeed Consulting Group LLC
121 North River Drive
Narragansett, RI 02882
(401) 284-1827 Business
(401) 284-1840 Fax

http://www.teraspeed.com

Teraspeed(r) is the registered service mark of
Teraspeed Consulting Group LLC



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=20
> 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=20
> is slightly limited).
>
> Thanks in Advance!!
>
> Regards
> Sunil.Bh
>
>       =20
> ---------------------------------
> Be a better pen pal. Text or chat with friends inside Yahoo! Mail. See
how.
>
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