Dr. Ahmed G. Abo-Khalil

Electrical Engineering Department

crest factor

The crest factor or peak-to-average ratio (PAR) or peak-to-average power ratio (PAPR) is a measurement of a waveform, calculated from the peak amplitude of the waveform divided by the RMS value of the waveform.


C = {|x|_mathrm{peak} over x_mathrm{rms}}

It is therefore a dimensionless quantity. While this quotient is most simply expressed by a positive rational number, in commercial products it is also commonly stated as the ratio of two whole numbers, e.g., 2:1. In signal processing applications it is often expressed in decibels (dB).

The minimum possible crest factor is 1, 1:1 or 0 dB.

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