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Signal-to-noise and distortion ratio (SINADR[1]) is a measurement of the purity of a signal. SINADR is typically used in data converter specifications. SINADR is defined as:

\mathrm{SINADR} = \frac{P_\mathrm{signal}}{P_\mathrm{quantizationError} + P_\mathrm{randomNoise} + P_\mathrm{distortion}}

where P is the average power of the signal, quantization error, random noise and distortion components. SINADR is usually expressed in dB. SINADR is a standard metric for analog-to-digital converter and digital-to-analog converter.

SINADR (in dB) is related to ENOB by the following equation:

\mathrm{SINADR} = ENOB\cdot 6.02 + 1.76


  1. ^ Lavrador, Pedro Miguel Telecommun. Inst., Univ. of Aveiro, Portugal de Carvalho, N.B.; Pedro, Jose Carlos (March 2004). "Evaluation of signal-to-noise and distortion ratio degradation in nonlinear systems" (PDF). IEEE Microwave Theory and Techniques Society 52 (3): 813 – 822. doi:10.1109/TMTT.2004.823543. ISSN 0018-9480. 

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