Howto quantize and calculate the signal to noise ratio for analog and digital signals
Terminology[]
- RMS - Root mean squared
- SNR - Signal to noise ratio
- ENOB - Effective number of bits
- dB - decibel
- Bandwidth
RMS Noise = (Noise level in X/root Hz)*sqrt (bandwidth)
Dynamic Range = SNR = RMS Full-scale/RMS Noise
Dynamic Range (dB) = SNR (dB) = 20*Log10 (RMS Full-scale/RMS Noise)
ENOB = log (FSR/RMS noise)/log (2)
The relationship between ENOB and SNR is
ENOB = (SNR(in dB) - 1.76) / 6.02
sources[]
http://www.analog.com/en/content/0,2886,760%255F788%255F91250,00.html