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 FasterCap and FastCap2
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Enrico

550 Posts
Posted - Feb 23 2008 :  09:41:40  Show Profile  Reply with Quote
Is there a way to define length units in FastCap2 as one can in Fasthenry?

Enrico

550 Posts
Posted - Feb 23 2008 :  09:41:58  Show Profile  Reply with Quote
No, there is no need, capacitance scales linearly with length (while inductance not, due to frequency-dependedn skin effects)
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Enrico

550 Posts
Posted - Feb 23 2008 :  09:42:19  Show Profile  Reply with Quote
Thanks for your reply! I am surprised about your answer about
capacitance scaling in 3D.

If I use the equation of a simple parallel plate capacitor
C =eps*A/d

If I scale all 3 dimension x,y,z by a constant factor then C should go
up since the area goes up as d2?

Thanks for clarifying this!
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Enrico

550 Posts
Posted - Feb 23 2008 :  09:43:04  Show Profile  Reply with Quote
If you scale x,y,z by a constant factor, say k, you have (assuming A = x*y):


C' = eps * k * x * k * y / (k * z) = k * eps * x * y /  z = k * C


so you see that capacitance scales of the same factor

Hope this clarifies
Enrico
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