Signal-to-noise and distortion ratio (SINAD) is a measure of the quality of a signal from a communications device, often defined as:
where 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).
When calculating the distortion, it is common to exclude the DC components.
Due to widespread use, SINAD has collected several different definitions. SINAD is commonly defined as:
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