What does SINAD stand for? 

SINAD

Signal-to-noise and distortion ratio (SINAD) is a measure of the quality of a signal from a communications device, often defined as S I N A D = P signal + P noise + P distortion P noise + P distortion , {\displaystyle \mathrm {SINAD} ={\frac {P_{\text{signal}}+P_{\text{noise}}+P_{\text{distortion}}}{P_{\text{noise}}+P_{\text{distortion}}}},} where P {\displaystyle P} is the average power of the signal, noise and distortion components. SINAD is usually expressed in dB and is quoted alongside the receiver RF sensitivity, to give a quantitative evaluation of the receiver sensitivity. Note that with this definition, unlike SNR, a SINAD reading can never be less than 1 (i.e. it is always positive when quoted in dB).

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