Hi Alexandre, Agilent ADS has a design flow integration with Allegro. It let's you export the critical nets to a .ads file for subsequent import into ADS Layout for analysis. There's a video of ADS Momentum (the 3D-planar EM simulator) creating S-parameters from layout at: http://wireless.agilent.com/vcentral/viewvideo.aspx?vid55 hth -- Colin http://signal-integrity-tips.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 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