Signal-to-Noise-and-Distortion Rati

Signal-to-Noise-and-Distortion Ratio It is measured signal to noise at the output of the DAC. The signal is the rms magnitude of the fundamental. Noise is the rms sum of all the nonfundamental signals up to half the sampling frequency (fMCLK/2) but excluding the dc component. The signal-to-noise-and-distortion ratio is dependent on the number of quantization levels used in the digitization process; the more levels, the smaller the quantization noise. The theoretical signal-to-noise-and-distortion ratio for a sine wave input is Signal-to-Noise-and-Distortion = (6.02N + 1.76) dB where N is the number of bits. Thus, for an ideal 10-bit converter, the signal-to-noise-and-distortion ratio = 61.96 dB.