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           Q factors for Inductors               


Q factors for Inductors

Lossy inductors can be modeled with an equivalent series loss resistor:

Using this model, Q factor takes the following form for inductors:

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For ideal lossless elements, Rd = 0, therefore Q is infinitely large. In that sense, high-Q inductors tend to have lower loss and are preferred over low-Q ones.

Practically, Q may be taken as constant over the frequency range of application. However Q may, as well, be a function of frequency. In these cases, Qo is specified at a certain frequency such as:

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Q(f) is then defined as either proportional to frequency or the square root of frequency:

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or

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