Hello, I have measured the near end crosstalk of a pair of open and short circuited package pins using TDR/T, i have used a setup similar to the JEDEC set up described in a TDA Systems application note for the extraction of inductance and capacitance. Previously I extracted a lumped equivalent circuit model for these pins from s-parameter measurements and 3D EM simulation. I simulated this model in PSpice using the same pulse risetime and terminations (open/short) as was used during TDR measurements and compared the results with my TDR/T measurements.But the measurements seem to be double in magnitude what PSpice is giving me. For example in the case of the open circuit package I am getting a 12mV peak but in Spice I only get 6mV, Is this due to multiple reflections from the short and open circuits being added together that is not calculated in Spice? I am confident with my extracted model, it agrees well with both measured and EM simulated s-parameters, also the inductance and capacitance values were calculated using Q3D extractor from Ansoft and there is good agreement with those values aswell. Any ideas would be great, Regards, Eoin Eoin Mc Gibney Cork Institute of Technology Ireland emcgibney@xxxxxx ------------------------------------------------------------------ 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