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 FasterCap and FastCap2
 Any way to change the default unit of FastCap
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2 Posts

Posted - May 13 2021 :  21:05:54  Show Profile  Reply with Quote
Hi there,

I'm using the FasterCap and noticed that the default unit is m. Is there any simple way to change it to mm similar to what we can do in FastHenry file (.unit mm)?

Enrico

447 Posts

Posted - May 16 2021 :  23:22:11  Show Profile  Reply with Quote
Actually there is no need. Contrary to mageto-quasi-static impedance, electro-quasi-static capacitance scales linearly with dimension.

So if a structure has m dimensions and results in x pF, the same structure with mm dimensions will have x nF capacitance.

If you still want the result directly in another scale you can simply use a different dimension in the permittivity value, the results will scale accordingly.

Best Regards,
Enrico
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Posted - May 17 2021 :  18:05:05  Show Profile  Reply with Quote
Hi Enrico,

Thanks for your reply. I was also thinking about scalability. It should be valid for linear systems.

Best,
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