Form factor (electronics)

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In electronics, the form factor of an alternating current waveform (signal) is the ratio of the RMS (Root Mean Square) value to the average value (mathematical mean of absolute values of all points on the waveform). In case of a sinusoidal wave, the form factor is approximately 1.11.


K_f = \frac{RMS}{Average} = \frac{\frac{1}{\sqrt{2}}} {\frac{2}{\pi}} = \frac{\pi}{2\sqrt{2}} \approx 1.110720735


In the case of a Square Wave, the RMS and the average value are equal; therefore, the form factor is 1.


K_f = \frac{RMS}{Average} = \frac{RMS}{RMS} = 1, RMS = Average

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