why not use ansoft to model and simulate it ? Zhangkun <zhang_kun@xxxxxxxxxx> wrote:Hi all: Could anyone tell me how to calculate the resistance and inductance of vias. The frequancy range is from DC to 50MHz. I have seen two formulars to calculate the inductance of vias. They are very differenct. One is from High Speed Digital Design written by Howard Johnson: L=5.08*h*(ln(4h/d)+1) L:inductance of via, nH h:length of via, inch d:diameter of via, inch The other is from one paper written by Mark Alexander: L=5.08*h*(ln(4h/d)-0.75) L:inductance of via, nH h:length of via, inch d:diameter of via, inch These two formular are different. Best Regards Zhangkun 2003.01.06 ------------------------------------------------------------------ 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 --------------------------------- Do You Yahoo!? "IBMÓŻݼÛÌØȨ£¬ËÏÈÀ´ËÏȵã¡" ------------------------------------------------------------------ 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