Palusa, The first question is whether or not your targeted simulator supports the inclusion of S-parameter descriptions for transient analysis. If so, then it probably uses some specific syntax to reference the S-parameter file from a SPICE subcircuit and you can reference the SPICE subcircuit from an IBIS [External Circuit] block.=20 This is NOT standard IBIS, since the specification states that the SPICE subcircuit complies with Berkeley SPICE 3f5 that, I think, doesn't support S-parameters. If your simulator supports S-parameters referenced from IBIS, then you need to talk to your simulator vendor for specifics on syntax. If you are using any of the Mentor Graphics SI tools, I can help you with syntax or get the right person to help. Good luck, Weston =20 -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of k palusa Sent: Sunday, October 09, 2005 5:44 PM To: si-list@xxxxxxxxxxxxx Subject: [SI-LIST] package S-parameters in IBIS Hi all, =20 IBIS 3.2 and 4.1 has the option of modeling package RLCG's . Does IBIS 3.2 or 4.1 has the option of modeling packge S-parameters? IBIS 4.1 has the option of modeling S_parameters. Is it only for I/O's or even for packages? I checked IBIS 4.1 spec. In the package modeling option we can specify RLCG matrices? But how do we model S-parameters? =20 Can someone help me with this..Thanks in advance.. =20 palusa =09 --------------------------------- Yahoo! Music Unlimited - Access over 1 million songs. Try it free. ------------------------------------------------------------------ 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: =20 //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 ------------------------------------------------------------------ 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