Hi Wolfgang, Thanks for the link. I haven't heard of IdEM before but it does look like a good tool that I will have to check out. Best, Timothy Coyle Editor In Chief XrossTalk Magazine 405 Western Ave #430 South Portland, ME 04106 Tel: 617.297.2566 Fax: 207.510.8099 Email: tim@xxxxxxxxxxxxxxxx http://www.xrosstalkmag.com <http://www.xrosstalkmag.com/> From: wolfgang.maichen@xxxxxxxxxxxx [mailto:wolfgang.maichen@xxxxxxxxxxxx] Sent: Tuesday, February 24, 2009 1:38 PM To: Timothy Coyle Cc: si-list@xxxxxxxxxxxxx; si-list-bounce@xxxxxxxxxxxxx Subject: Re: [SI-LIST] Preparing S-Parameters for Simulation Hi Timothy, you may want to check out the IdEM tool (http://www.idemworks.com/index.htm) - they put a lot of effort into ensuring passivity and causality of their input data before creating any macromodels. Wolfgang "Timothy Coyle" <tim@xxxxxxxxxxxxxxxx> Sent by: si-list-bounce@xxxxxxxxxxxxx 02/24/2009 09:51 AM To <si-list@xxxxxxxxxxxxx> cc Subject [SI-LIST] Preparing S-Parameters for Simulation Hi, I am working on a tutorial for the next issue of XrossTalk Magazine about getting S-Parameter models ready for simulation. I see a lot of S-Parameter models from lab measurements and simulation tools that have a lot of quality issues (causality and passivity) and have to do a lot of clean up to make them suitable for simulation. I have my own bag of tricks I use as well as some good books on S-Parameter theory and application notes but I would like to hear from other people what their approaches are or some good resources. For some particular specifics review the list below: . What considerations should go into setting up a simulation tool to extract an S-Parameter model? (bandwidth to be used, number of points, importance of linear spacing of points, starting at DC, etc) . A lot of tools will automatically "fix" causal and passivity issues or enforce them. What's the pros and cons for this? What do engineers need to look out for when they do this? . What's the best way to clean up a lab measured S-Parameter model with poor resolution? . What type of quality checks should you perform on an S-Parameter model before simulating? (what do you look for in the S21 plots, do you use smith charts, ect?) Thanks for any and all suggestions and links. Best, Timothy Coyle Editor In Chief XrossTalk Magazine 405 Western Ave #430 South Portland, ME 04106 Tel: 617.297.2566 Fax: 207.510.8099 Email: tim@xxxxxxxxxxxxxxxx http://www.xrosstalkmag.com <http://www.xrosstalkmag.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 ------------------------------------------------------------------ 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