FreeLists / si-list / [SI-LIST] How to calculate the resistance and inductance of vias

[Zhangkun <zhang_kun@xxxxxxxxxx>]

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


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