I am interested in ploting Common and Differential Mode Impdeance vs. Frequency for a common mode Choke device. Using equivalent circuit models of the Choke I have managed to create 4-port S-parameters As well as convert them into 4-port Z-parameters. I Have conversions to 2-port mixed mode S-parameters As well. I was interested to know if there is a set Of conversions for mixed mode Z-parameters, or if There is such a thing. I have Commom mode return loss S1c1c, but I am Not sure how that translates in to an impedance. Ie Zc = (1-S1c1c)/(1+S1c1c)... Does that apply To mixed mode. I have my doubts, but am definitely Not sure. Regards, Merrick CONFIDENTIALITY NOTICE: This message (including any attachments) may contain Molex confidential information, protected by law. If this message is confidential, forwarding it to individuals, other than those with a need to know, without the permission of the sender, is prohibited. This message is also intended for a specific individual. If you are not the intended recipient, you should delete this message and are hereby notified that any disclosure, copying, or distribution of this message or taking of any action based upon it, is strictly prohibited. Chinese Japanese www.molex.com/confidentiality.html ------------------------------------------------------------------ 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