Name a couple - Q3D, ICE MAX, HFSS (for really high frequency) --- Prathibha <prathibha@xxxxxxxxxxxxxxx> wrote: > > Hi Gurus , > > How can we get the RLC values for a package ?. We > have extracted package > model, but could not get a combined RLC values . We > are using APD for > designing the package . > > Please advise . > > Thanks and Regards, > Prathibha > > > > > -----Original Message----- > From: si-list-bounce@xxxxxxxxxxxxx > [mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of > Istvan Novak > Sent: Thursday, May 04, 2006 6:40 PM > To: GStokes@xxxxxxxxx > Cc: SI-List > Subject: [SI-LIST] Re: Routing Signals Between PWB > Layers - Part 2 > > > Geoff, Doug, > > This example nicely shows the importance of proper > power distribution > design. > > 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. > > 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. > > 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. > > Regards, > > Istvan Novak > SUN Microsystems > > > > Geoff Stokes wrote: > > >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 > >=20 > >+44-161-622-4857 > >www.zetex.com > >www.zetex.cn > >=20 > > > >=20 > >-----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=20 > >article on signals that change layers in a PWB. > > > >Abstract: Printed wiring board, PWB, signal paths > must often change=20 > >layers in a board stackup. Under some conditions > this can cause=20 > >problems. An emissions example is used to > illustrate the conditions=20 > >where changing layers can cause problems. > > > >The link to the article is the picture of the > emissions plot at the=20 > >bottom of the home page at http://emcesd.com . > > > >There is also an audio discussion of this article > on my podcast site:=20 > >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=20 > >will then be able to play on most computers. Since > the last HFNews=20 > >there have been two new podcasts posted. > > > >Doug > >--=20 > >------------------------------------------------------- > > ___ _ Doug Smith > > \ / ) P.O. Box 1457 > > =3D=3D=3D=3D=3D=3D=3D=3D=3D 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 > > 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 > > === message truncated === __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com ------------------------------------------------------------------ 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