It depends on what interconnect spec. you are trying to meet ... 10-15 in. of 6 mil trace on FR4 would be way too much for XFI for example but perfectly ok for KR. Thanks, Vinu Filion, Marc-Andre wrote: > Hi, > I've got an easy Friday question. When it's time to design board with > multi-gigabit (> 5Gb) differential signal, we always get lost into a > discussion with CAD guys. We want more trace width to reduce loss and they > want more real-estate to fit everything. In that case, increasing dielectric > thickness is not an option because it will ruin the rest of the layer > trace-2-trace clearance. In the end, we're stuck with a 6 mils trace that > will handle a 10G signal. We know, from previous design, that it's working, > but I'm not sure if this is good practice. We have to go into 10 ~ 15 inch of > routing with interconnect. > > > > Is there a rule of thumbs about trace width and signal speed? > > When Skin effect become a problematic issue? > > > > Many thanks, > > > > Marc-André Filion > > > > > ------------------------------------------------------------------ > 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 > > 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 Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu