Hi all, I am trying to simulate the effect of mutual inductance and mutual capacitance between a pair of parallel conductors in hspice. I will describe the two cases that I am trying to do and the results observed. case1) When the 2 parallel conductors have the same length, width, thickness and the overlap length = length of the conductor(s): _____________________________ |____________________________| _____________________________ |____________________________| In the above case, when the signal propagates in even mode along both the conductors, if I use the transformation of L_even = L11 + Lm and C_even = C11 - Cm on any of the conductors (and neglecting the effect of the other conductor) then the Voltage vs time curve at the terminal end of the conductor exactly corresponds to the Voltage vs time curve obtained without doing the transformation and keeping the effect of both the conductors in the hspice netlist. Here Lm and Cm denotes mutual inductance and mutual capacitance respectively. The same is observed in odd mode by doing the transformation L_odd = L11 - Lm and C_odd = C11 + Cm. Hence the theory (Stephen Hall) actually holds during simulation. case2) When the 2 parallel conductors have UNEQUAL lengths but same width and thickness and the OVERLAP LENGTH != length of the conductor(s). Meaning one conductor is displaced w.r.t the other conductor. ____________________ |___________________| _____________________________________ |____________________________________| In this case after finding the Lm and Cm I use the same transformation as case1 and the same experimentation setup as above, but the V vs time curve DOES NOT give an exact match for the two experiments in bot even and odd mode. Can anyone suggest the reason behind the discrepancy observed in these two cases? Probably the way Lm is calculated in case 2 is an approximation, but still I guess the curves should closely follow each other, which is not happening. It might also happen that the way the transformation needs to be done in case2 is different from the way I am doing. Thanks, Amitava Amitava Bhaduri Research Assistant 527 ERC University of Cincinnati OH - 45221 ph(lab) : 513-556-3025 ------------------------------------------------------------------ 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