Application Note
Using CCDF As A Method Of Measuring P1dB And P3dB
To better understand CCDF curves, a digitally modulated signal is examined. Figure A shows the power versus time plot of the digital signal. Observing the signal in the time domain, this plot represents the instantaneous envelope power defined by the equation: Power = I2 + Q2 where I and Q are the in-phase and quadrature components of the waveform.
Unfortunately, the signal in this form is difficult to quantify because of its inherent randomness and inconsistencies. In order to extract useful information from this noise-like signal, we utilize a statistical description of the power levels in this signal; a complementary cumulative distribution function (CCDF) curve provides us with the means.
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