Q factor is a measure of the "quality" of a
resonant system. Resonant systems respond to
frequencies close to the natural frequency much more strongly than they respond to other frequencies. On a graph of response versus frequency, the
bandwidth can be defined as the "full width at half maximum" or FWHM. The Q factor is defined as the resonant frequency divided by the bandwidth:
- Q = ω_{0} / Δω
In a TRF[?]:
- <math>Q = \frac{1}{R} \sqrt{\frac{L}{C}} </math>
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