Hi, Experts Here we need to control trace impedance for microstrip on top layer. 5mil width for 50 ohm single ended line 4mil width and 8mil space for 100 ohm differential line. I am worried that the single ended and differential pair has different trace width. Is it possible to implement this kind of impedance control? Regards. Tesla ------------------------------------------------------------------ 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