What are the general guidelines regarding implementing asymetrical stack-ups to compensate for a GND-Sig-Sig-PWR in order to encourage coupling to the utility layers for return current paths? Are there recommendations to the thickness of the dielectric thickness between the Sig-Sig layer versus the GND-SIG or SIG-PWR.....so for interfaces below 400Mhz would an acceptable guideline be x3's.......I am just looking for some guidelines given lack of access to modeling tools. ------------------------------------------------------------------ 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