**From:** Chao-tung Yang (*ctyang@adlink.com.tw*)

**Date:** Tue Nov 09 1999 - 15:50:23 PST

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Dear All,

Most of the impedance calculation softwares only calculate the

impedance of straight line without through hole or via. But in

a backplane, there are lots of through holes along with the lines.

Obviously, these through holes will reduce the impedance of the line.

Does any one know any tool or method which can calculate the

impedance of a line with vias?

Thanks,

CT Yang

ADLink Technology, Inc.

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