Hi, Group, I have a question about the usage of "multi-terminal networks" element in H-SPICE. (1) I need to put two frequency-dependent impedances in both ends of a transmission line (1 wire W Element). Thus, I used "Scattering Parameter Element" in H-SPICE to describe the two impedances. In this model, I specifies 1601 data points (frequency range 10 M Hz to 600 M Hz). The format is like that: .MODEL fmod_load sp N=1 FSTART=10e6 FSTOP=600e6 + SPACING=LINEAR + DATA = 1601 * real part imaginary part + ... ... + ... ... *the 1601th point + ... ... However, the simulation result seems not correct. (2) Therefore, I plan to use another more simple example to test the validness of the "S-parameter Element". Two frequency-independent inductances are used as terminations at both ends of the same transmission line. Since we know the characteristic impedance of the transmission line, and the impedance values of the terminations, we can obtain the "equivalent S-parameter" of the two terminations. Test1: I directly used two "inductance elements" in H-SPICE to get results. Test2: I used two "equivalent S-parameter Elements" to replace the two inductances in H-SPICE. The results in the two cases are different. (3) Does it mean that the "S-parameter Element" of H-SPICE is invalid to represent the frequency-dependant loads. Anyone who has such experiences or know the reasons about these problems, please give me some nice suggestions. Your kind help will be highly appreciated. thanks, Geping Liu ------------------------------------------------------------------ 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 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