Effective Number of Bits - Definition

Definition

An often used definition for ENOB is

,

where all values are given in dB, and

  • SINAD is the ratio indicating the quality of the signal
  • The 6.02 term in the divisor converts decibels (a log10 representation) to bits (a log2 representation)
  • The 1.76 term comes from quantization error in an ideal ADC

This definition compares the SINAD of an ideal ADC or DAC with a word length of ENOB bits with the SINAD of the ADC or DAC being tested.

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