SNDR Calculator
Signal-to-Noise-and-Distortion Ratio. SNDR = Psignal/(Pnoise + Pdistortion).
SNR = 70.00 dB
SINAD, analog only = 69.59 dB (no quantisation)
SINAD incl. quantisation (12-bit) = 68.25 dB
SDR (signal / distortion) = 80.00 dB
THD = -80.00 dBc
ENOB = (SINAD incl. quantisation − 1.76)/6.02 = 11.043 bits
Ideal 12-bit SQNR = 6.02·N + 1.76 = 74.01 dB
Powers are referred to the ADC input; SQNR assumes a full-scale sine and uniform quantisation error.
Model and references
Textbook approximation. A standard approximation from the literature (for example paraxial, plane-wave or Gaussian-beam), valid within the range the page states. About the tiers
Power ratios as defined by IEEE 1241; the ideal SQNR assumes a full-scale sine and quantisation error uniform over one LSB. THD is the entered distortion power, not a sum of measured harmonics.
- IEEE Std 1241-2010. IEEE Standard for Terminology and Test Methods for Analog-to-Digital Converters. SINAD, ENOB and THD definitions. doi:10.1109/IEEESTD.2011.5692956
- Kester W. (2009). MT-001: Taking the mystery out of the infamous formula SNR = 6.02N + 1.76 dB, and MT-003: Understand SINAD, ENOB, SNR, THD, THD + N, and SFDR. Analog Devices tutorials.