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RLC report in Hyperlynx

Question asked by tonyvalente on Feb 2, 2018
Latest reply on Feb 8, 2018 by weston_beal

Greetings All,

 

I am using the PADs HyperLynx v9.4.1 to run a RLC repot for a board I am working on. The report states that on one trace I has a total inductance of 6.9nH. However, using a third party calculator (same variables) I am getting a total inductance on the same traces as 25.08nH.

The formula for this calculator uses is as follows:

 

Lms = 0.00508L[ ln (2L/(W+H) + 0.5 + 0.2235*((W+H)/L)]

 

Lms = Inductance of microstrip in microhenreis

W = width of strip (inches)

L = length of strip (inches)

H = distance between the strip and the ground plane

 

What formula does HyperLynx use to calculate the inductance on the RLC report?

I’m trying to figure out why there is such a large discrepancy.

 

Any advice would be greatly appreciated.

 

Thanks,

Tony

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