Self Resonant Freq of Spiral Inductor

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Discussion Overview

The discussion revolves around determining the self-resonant frequency (SRF) of a flat spiral inductor, focusing on both theoretical and experimental approaches. Participants explore methods for calculating the inductance and capacitance necessary for finding the SRF, as well as the challenges associated with these calculations.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested, Experimental/applied

Main Points Raised

  • One participant inquires about a model for calculating the self-resonant frequency, noting they can determine inductance but struggle with capacitance.
  • Another participant suggests using a square wave to measure the SRF directly with a spectrum analyzer, providing a link to a related invention.
  • A different participant proposes finding the resonance frequency experimentally and mentions the relationship ω=√LC to derive capacitance if inductance is known.
  • One participant expresses a desire to determine the SRF theoretically, highlighting the need for known parameters for printed circuit board applications.
  • Another participant comments on the difficulty of obtaining straightforward answers in engineering, implying that some challenges are inherent to the field.

Areas of Agreement / Disagreement

Participants express differing views on the feasibility of obtaining theoretical versus experimental answers for the SRF, with some emphasizing the complexity of the problem and others suggesting practical measurement methods.

Contextual Notes

Participants acknowledge the difficulty in determining capacitance and the lack of straightforward solutions, indicating that assumptions and definitions may vary in their approaches.

buzachaka
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Is there a model for determining the self resonant frequency of a flat spiral inductor? I can determine the inductance but the capacitance is escaping me.

Thanks for any help.
 
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Here is one link to an invention that measures it. I would think you could just hit the inductor with a square wave and measure the results with a spectrum analyzer, would give the SRF directly. But here is the link:
http://www.patentstorm.us/patents/7451415/description.html
 
Last edited by a moderator:
You could find the frequency at which resonance occurs, experimentally. If you already know the value of L then ω=√LC will give the you the capacitance.
But I guess you want to do this theoretically?
 
I would like to be able to determine the srf theoretically. The project requires the inductors to be printed on circuit boards and I need to know the parameters beforehand. Why can there be no easy answers.
 
He wants easy answers - my life. They are things you just can't always expect in engineering. Some things are 'just hard'.
 

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