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 121 North River Drive Narragansett, RI 02882 (401) 284-1827 Business (401) 284-1840 Fax http://www.teraspeed.com Teraspeed® 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 > 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 > > > --------------------------------- > Be a better pen pal. Text or chat with friends inside Yahoo! Mail. See how. > > ------------------------------------------------------------------ > To unsubscribe from si-list: > si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field > > or to administer your membership from a web page, go to: > //www.freelists.org/webpage/si-list > > For help: > si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field > > > List technical documents are available at: > http://www.si-list.net > > List archives are viewable at: > //www.freelists.org/archives/si-list > or at our remote archives: > http://groups.yahoo.com/group/si-list/messages > Old (prior to June 6, 2001) list archives are viewable at: > http://www.qsl.net/wb6tpu > > > > ------------------------------------------------------------------ > To unsubscribe from si-list: > si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field > > or to administer your membership from a web page, go to: > //www.freelists.org/webpage/si-list > > For help: > si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field > > > List technical documents are available at: > http://www.si-list.net > > List archives are viewable at: > //www.freelists.org/archives/si-list > or at our remote archives: > http://groups.yahoo.com/group/si-list/messages > Old (prior to June 6, 2001) list archives are viewable at: > http://www.qsl.net/wb6tpu > > > > ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List technical documents are available at: http://www.si-list.net List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu