I Brett and Ozmur, I used the "Two Coupled Lines, Constant width" block (ML2CTL_C) and it worked fine. I had to convert the original RLGC values into the format used by ADS: Basically, the conversions were: C -> C/eps0 L -> L/mu0 R -> R Rs -> Rs*sqrt(1e9) (ohm/sqrt(GHz)) Gd -> Gd/(2*pi*eps0) Then, there is the "ReuseRLGC" option in that block that when set to "yes" inhibits the internal ADS field solving to occur. This way, no matter what values I use to describe the stackup physical parameters, ADS will always use the given RLGC file. Thanks to both of you. Henrique On Thu, 24 Feb 2005, Ozgur Misman wrote: > Well, > I think the coupled t-line elements in the ADS multilayer interconnect > libaray account for the metal loss. > Substrate loss can also be defined in the stackup and also is part of > multilayer library, > Obviously this is not whats being asked here but as a general pointer i > know that lossy coupled transmission line models > are part of ADS library and simulations that properly accounts for > dielectric and metal losses > is something that can be accomplished within ADS. > Ozgur > On Thu, 24 Feb 2005, Grossman, Brett wrote: > Henrique, > > I apologize if this sends you in the wrong direction as I am pulling it > from a rusty memory. > > But... > > Within ADS, the transmission line elements in the multi-layer library > have an option to save the model in RLGC format. I believe that this > same element can then be used to point back to the RLGC file, and then > use this file instead of the internal field solver to define the model. > > > I also believe that the format of the RLGC matrix elements is defined > differently between ADS and Hspice, and that ADS describes their format > (and perhaps the difference) in their help files. > > So, you could convert your RLGC matrix into an ADS RLGC matrix file, and > then use the mutli-layer tline element to point to this new file. > > Sorry again if any of this is incorrect. I have a recollection of doing > it once, and writing an excel macro to generate the ADS file from the > Hspice file. But unfortunately lack the recall ability to find it > immediately. > > Best regards, > -Brett ------------------------------------------------------------------ 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