Polar's CITS25 software is quite accurate and easy to use. It comes with several different impedance cells. Even though Polar is no longer supporting this tool, you will still be able to find the free evaluation version somewhere in the web. The only evaluation restriction is the total number of calculations, and it can be reset with uninstalling and re-installing. BR Gert ---------------------------------------- Absender ist HARTING Electronics GmbH, Marienwerderstraße 3, D-32339 Espelkamp; Registergericht: Amtsgericht Bad Oeynhausen; Register-Nr.: HRB 8808; Vertretungsberechtige Geschäftsführer: Dipl.-Kfm. Edgar-Peter Düning, Dipl.-Ing. Torsten Ratzmann, Dr.-Ing. Alexander Rost -----Ursprüngliche Nachricht----- Von: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] Im Auftrag von Hithesh Gesendet: Donnerstag, 3. Januar 2013 06:04 An: SI-List Betreff: [SI-LIST] Asymmetric differential stripline impedance Hi foks, Is there any online tool to calculate the impedance of assymetric differential stripline? I searched, nothing available for asymmetric differential. It's either asymmetric stripline or symmetric differential. How to calculate differential impedance from single ended impedance? This is with reference to USB signals. Thanks -Hithesh ------------------------------------------------------------------ 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 forum is accessible at: http://tech.groups.yahoo.com/group/si-list List archives are viewable at: //www.freelists.org/archives/si-list 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 forum is accessible at: http://tech.groups.yahoo.com/group/si-list List archives are viewable at: //www.freelists.org/archives/si-list Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu