Just curious. What is the approximate single user cost of those products? Thanks - Joel Scott McMorrow wrote: > Sigrity Power SI and Ansoft SIWave will both do what you're looking for. > 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 > > > > Nima Lotfi wrote: > >> Istvan, >> >> I'm looking for a tool to simulate board resonance. Did you use >> simulation software to confirm the frequency of modal resonance of the >> PCB planes? If so can tell me what tool you've used. >> >> Thanks,=20 >> ______________________=20 >> Nima Lotfi, P. Eng=20 >> Digital Hardware Design Engineer=20 >> Nortel >> >> >> 758-7786 ESN=20 >> (403) 769-7786 Direct=20 >> (403) 769-5350 Fax=20 >> LNima@xxxxxxxxxxxxxxxxxx=20 >> >> >> >> >>> -----Original Message----- >>> From: si-list-bounce@xxxxxxxxxxxxx >>> >>> >> [mailto:si-list-bounce@xxxxxxxxxxxxx] >> >> >>> On Behalf Of Istvan Novak >>> Sent: Thursday, May 04, 2006 7:10 AM >>> To: GStokes@xxxxxxxxx >>> Cc: SI-List >>> Subject: [SI-LIST] Re: Routing Signals Between PWB Layers - Part 2 >>> =20 >>> Geoff, Doug, >>> =20 >>> This example nicely shows the importance of proper power distribution >>> design. >>> =20 >>> The emission peaks correspond to the modal resonances of the PCB >>> >>> >> planes. >> >> >>> As Doug points out in the article, moving the planes closer would >>> >>> >> reduce >> >> >>> the >>> emission about proportionally. However, if one wants to stay with a >>> four-layer >>> construction, reducing the plane separation is not a viable solution: >>> >>> >> it >> >> >>> would >>> either result in an unmanageably thin board, or if we add the >>> >>> >> tickhness >> >> >>> back to >>> the top/bottom dielectrics, in a dramatically reduced routing density. >>> =20 >>> Nearby grounding vias would help, but in practical cases the two >>> >>> >> planes >> >> >>> are at >>> different DC potentials, so it must be a bypass capacitor rather than >>> >>> >> a >> >> >>> stitching >>> via. A single bypass capacitor will do little in the hundreds of MHz >>> frequency range, >>> even if it serves only one signal. Also, if we have wide busses >>> >>> >> instead >> >> >>> of a single >>> trace, trying to provide a return path locally to all of the layer >>> transitions becomes >>> much harder to implement. >>> =20 >>> A more realistic and straightforward solution is to design the >>> power-distribution >>> network in such a way that it does not exhibit large resonances. In >>> multi-layer >>> boards, where we may also have ground-ground planes creating such >>> cavities, the >>> solution is stitching vias, but not necessarily near the layer >>> transitions. We would >>> just need to make sure that the large resonating cavity is broken up >>> >>> >> to >> >> >>> sufficiently >>> small blocks such that the lowest resonance frequency is safely above >>> the highest >>> frequency of excitation. >>> =20 >>> Regards, >>> =20 >>> Istvan Novak >>> SUN Microsystems >>> =20 >>> =20 >>> =20 >>> Geoff Stokes wrote: >>> =20 >>> >>> >>>> Hi Doug >>>> >>>> In this experiment, you appear to have no plane vias adjacent to the >>>> signal vias. What would happen if a few plane vias were added around >>>> the transitions and fairly close by? >>>> >>>> Geoff Stokes >>>> Systems Engineer >>>> Zetex Semiconductors plc >>>> Zetex Technology Park >>>> Chadderton >>>> Oldham >>>> OL9 9LL >>>> UK >>>> =3D20 >>>> +44-161-622-4857 >>>> www.zetex.com >>>> www.zetex.cn >>>> =3D20 >>>> >>>> =3D20 >>>> -----Original Message----- >>>> From: si-list-bounce@xxxxxxxxxxxxx >>>> >>>> >> [mailto:si-list-bounce@xxxxxxxxxxxxx] >> >> >>>> On Behalf Of Doug Smith >>>> Sent: 03 May 2006 21:41 >>>> To: SI-List >>>> Subject: [SI-LIST] Routing Signals Between PWB Layers - Part 2 >>>> >>>> Hi All, >>>> >>>> I have been writing and recording again and have posted part 2 of >>>> >>>> >> my=3D20 >> >> >>>> article on signals that change layers in a PWB. >>>> >>>> Abstract: Printed wiring board, PWB, signal paths must often >>>> >>>> >> change=3D20 >> >> >>>> layers in a board stackup. Under some conditions this can cause=3D20 >>>> problems. An emissions example is used to illustrate the >>>> >>>> >> conditions=3D20 >> >> >>>> where changing layers can cause problems. >>>> >>>> The link to the article is the picture of the emissions plot at >>>> >>>> >> the=3D20 >> >> >>>> bottom of the home page at http://emcesd.com . >>>> >>>> There is also an audio discussion of this article on my podcast >>>> >>>> >> site:=3D20 >> >> >>>> http://emcesd-podcast.com where the direct link to the article is: >>>> >>>> http://emcesd-podcast.com/2006/may/2006-0503.mp3 >>>> >>>> Can't download mp3 files? Download the following instead: >>>> >>>> http://emcesd-podcast.com/2006/may/2006-0503.dcs >>>> >>>> After download, change the extension from .dcs to .mp3 and the >>>> >>>> >> file=3D20 >> >> >>>> will then be able to play on most computers. Since the last = >>>> >>>> >> HFNews=3D20 >> >> >>>> there have been two new podcasts posted. >>>> >>>> Doug >>>> --=3D20 >>>> ------------------------------------------------------- >>>> ___ _ Doug Smith >>>> \ / ) P.O. Box 1457 >>>> =3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D=3D3D Los = >>>> >>>> >> Gatos, CA 95031-1457 >> >> >>>> _ / \ / \ _ TEL/FAX: 408-356-4186/358-3799 >>>> / /\ \ ] / /\ \ Mobile: 408-858-4528 >>>> | q-----( ) | o | Email: doug@xxxxxxxxxx >>>> \ _ / ] \ _ / Website: http://www.dsmith.org >>>> ------------------------------------------------------- >>>> >>>> >>>> >>>> >>>> >>> ------------------------------------------------------------------ >>> To unsubscribe from si-list: >>> si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field >>> =20 >>> or to administer your membership from a web page, go to: >>> //www.freelists.org/webpage/si-list >>> =20 >>> For help: >>> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field >>> =20 >>> List FAQ wiki page is located at: >>> http://si-list.org/wiki/wiki.pl?Si-List_FAQ >>> =20 >>> List technical documents are available at: >>> http://www.si-list.org >>> =20 >>> 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 >>> =20 >>> =20 >>> >>> >> ------------------------------------------------------------------ >> 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 FAQ wiki page is located at: >> http://si-list.org/wiki/wiki.pl?Si-List_FAQ >> >> List technical documents are available at: >> http://www.si-list.org >> >> 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 FAQ wiki page is located at: > http://si-list.org/wiki/wiki.pl?Si-List_FAQ > > List technical documents are available at: > http://www.si-list.org > > 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 > > > > -- Binary/unsupported file stripped by Ecartis -- -- Type: text/x-vcard -- File: joel.vcf ------------------------------------------------------------------ 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 FAQ wiki page is located at: http://si-list.org/wiki/wiki.pl?Si-List_FAQ List technical documents are available at: http://www.si-list.org 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