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  3. How to extract the Resistance and Reactance of a Inductor...

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How to extract the Resistance and Reactance of a Inductor?

Alex Liao
Alex Liao over 9 years ago

Hi,

Giving the geometry, radius, width, and turns, the rough inductance(Lind) and quality factor(Qind) can be computed. This can be viewed from the property of a modelled Ind device (say, spiral_std_mu_z) in a given technology in the Cadence Schematic tool. By sweeping the geometry parameters, one can have the relationship between Qind and Lind like the attached plot (c).

As it is known that the inductor can be modelled in a parallel LC or Series LC network depending on its schematic.

Plot (a) and (b) also show that the Parallel (Rp) and Series Resistance (Rs) of this Ind are also acquired.

I am wondering are there such parameters, Rs and Rp, which can be viewed directly in Cadence (see different Rs and Rf by varying different geometry values or Lind values), like the Qind?

[i.e., How to get or verify the resistance or reactance of a Inductor in Cadence ?]

 I also did an AC simulation with the test circuit as attached:

I have noticed I can view several resistance via result browser, instance parameter,

rs1_1, rs2_1 rs_3_sub, rx_2_3_sub with r(Ohm) field like,  = 2.015.

Not sure if those are more or less related to what I want Rs or Rp.

Thanks,

Alex

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  • Alex Liao
    Alex Liao over 9 years ago
    Still nobody shed light on?
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  • Tawna
    Tawna over 9 years ago

    Hi Alex,

    If this is a critical question that needs a quick response, please contact Customer Support at http://support.cadence.com .

     

    best regards,

    Tawna

     

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  • analogy
    analogy over 9 years ago

    First half of this article discusses how to find Resistance- Inductance - Quality factor of inductor.

    Hope it helps.

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  • analogy
    analogy over 9 years ago
    You can also look at model file of inductor cell (spice nodes) and try to "recreate" inductor model. Although it might sound intimidating at first, if you spend few minutes, you will get a hang of it. Usually, most inductors are presented either as "5 - element" or "9-element" models to add interwinding and substrate capacitance.
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