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Tadeu
Brazil
1 Posts |
 Posted - Feb 11 2010 : 14:09:45
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Could someone explain me the value 1.55 mils assigned to eq. (2) in the page 26 of the manual (FastHenry3 User's Guide)?
Equation is about skin depth.
Using SI units (f=10^8, rho=5.8x10^7, u=4xpix10^-7, I have found 6.61x10^-6 meter, which converted to mils (1 mil = 25.4x10^-6 meter) results 0.26 mil.
The value 1.55 mils is fundamental to discussion in the section 2.4.2.
Could this value to be wrong ?
Thanks for any feedback. |
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chromatik
France
29 Posts |
Posted - Sep 21 2010 : 16:38:36
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Tadeu,
I reply quite late, but I think you're right.
With SI values, at 100MHz in copper, the skin effect is about ~6-7 um, so ~0.3mils.
Maybe I'm wrong, but I would likely to know where's my mistake.
Regards |
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eactor
5 Posts |
Posted - Nov 08 2010 : 03:37:31
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The problem is that you mixed up rho and sigma.
wiki stats coper:
sigma 59.1e+06 Ohm/m rho =16.78 e-009 ohm m
User Guide stats
sigma 1.641e+06 and it doesn't say that it is copper
so using the right rho with copper the depth is 6.6 µm
using the material out of the user guide you will end up with 1.5 mil
cheers
eactor
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Doubt about value in the FastHenry Manual
