SINADR

Signal-to-noise and distortion ratio (SINADR) 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 effective number of bits (ENOB) by the following equation:

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

See also

• Signal-to-noise ratio