Hello All, Can anybody tell me : 1. Is electrical length of a line is related to its wavelength and rise = time both. Literature tells that a line is long (or short) depending = upon=20 its physical length with respect to its quarter wavelength. But when = we talk about PCB systems; we talk about rise time (we generally don't=20 bother about frequency). Johnson & Graham(Handbook of Black magic) = showed a relationship l =3D Tr/D; l is electrical length, Tr is rise = time and D is propagation delay. Book says line length should be = less than l/6 for lumped systems. =20 So is there any relationship of rise time and wavelength to correlate = the two texts?? =20 Gaurav. ------------------------------------------------------------------ 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