I'm not sure this is what you are looking for or not... There is a description in Ron Poon's book: Computer Circuits Electrical Design, pg 198. He defines a magnetic coupling coefficient km and a capacitive coupling coefficient kc with regard to coupled transmission lines km = Lm/(SQRT(L1*L2)) kc = Cm/(SQRT(C1*C2)) Lm and Cm are mutual inductance and mutual capacitance per unit length L1 and L2 are self inductance and capacitance per unit length. As a rough guideline: if km and kc are less than 0.2, the lines are said to have "loose" coupling. I hope it helps, - Rick At 07:30 PM 11/30/2004 +0800, Cortex Chen wrote: >Dear Abe Riazi, >How to determine the tightly and loosely coupled pairs? > >Regards, > >Cortex > > > > >------------------------------------------------------------------ >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 > ------------------------------------------------------------------ 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