Two handy transmission line formulas: C = td/Z L = td X Z td is the propagation time Z is the characteristic impedance Example: 1 cm of line, Z = 100 ohms, time is 67 ps (effective relative dielectric constant is 4) C = 67ps/100 ohms = 670 fF L = 67ps X 100 ohms = 6.7 nH Dave Cuthbert On Sat, Oct 24, 2009 at 3:34 AM, rahul kumar <rahul05kumar@xxxxxxxxx> wrote: > Hello all, > I have seen in standards quoting transmission line capacitance equal to > 1.5pF per cm . How this number is calculated? > Is this value frequency dependent? transition dependent ? > > Kindly help. > Suggest link to know more information about the same. > > Thanks > > > ------------------------------------------------------------------ > 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 > 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 technical documents are available at: http://www.si-list.net 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