After seeing interest on this topic, I thought it might be helpful to address this from Ansoft's point. HFSS outputs S parameters in Touchstone format which can be used directly in certain time and frequency domain circuit simulators. Please speak with Cadence to discuss whether your version of Spectre will support S parameters in Touchstone format. Because many of our HFSS users are linking EM solutions directly into circuit and system simulation programs to optimize performance, this topic is the primary focus of Ansoft's 2005 application workshop, Converge. At the Converge Application Workshop in San Jose, CA, Dr. Albert Yen from UMC is one of the guest speakers and will present New Era for RFCMOS. This presentation specifically focuses on adding EM fidelity to circuit and system design using HFSS and Nexxim operating within the best in class design flow, Cadence ADE. Dr. Yen will highlight UMC's design flow that enables these new high performance CMOS circuits, illustrates new methods (dynamic link) to smoothly pass data from EM solvers to circuit simulators, and presents measured vs. simulated data to validate this solution. For engineers in San Jose, the event is Oct 27th. The event will also feature presentations from esteemed University professors and other notables in the field of high performance design. One of the keynote presentations will be delivered by Professor Paul Huray, who heads the Signal Integrity Education and Research at the University of South Carolina. This engineering program is one of the nation's first signal integrity graduate programs. The event will also include presentations on a new signal integrity design flow being used at Intel, a joint presentation from Xilinx and Ansoft on SSO analysis, PCI express and FBDimm for gigabit serial channel design, 60Ghz CMOS radio circuits, Advanced LNA and VCO design, PLL design for WIMAX radio, UWB circuit design, RFID and much more. For more information, please go to http://www.ansoft.com/converge. I am quite certain this event will be useful for all SI engineers and hence I invite you all to attend the local show in San Jose and/or the event to be held in Boston, Los Angeles, along with other cities in the North America and Europe. Mike Kang, Ansoft Applications Engineer ------------------------------------------------------------------ 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