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Spiral coil parasitic capacitance

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alba452

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Hey, guys
I am trying to make a round spiral inductor with high inductance and low parasitic capacitance. How can I calculate parasitic capacitance?
Is there any good website or program to calculate both of them?
It's going to be better if it calculates Q factor as well.
 

You can always try to input a sinous signal into the coil. Make sure the signal source have some output resistance. A signal generator would be good.
Then meassure (with an ociloscope) the peak voltage as you increase the frequenzy.
At a certain freq, the peak voltage will read a higher value than for other frequenzys. Thats because stray capasitance and the coils inductance is in resonance wich each other.
 

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