Since real Data Converters have a number of non-idealities
we need to use a Performance Metrics to evaluate and
compare them. In what follows we will attempt to define it.
The number of bits of the digital code is finite: for n-bit we have 2
n
codes and each code represents a given quantization level.
The error due to the quantization is called quantization error and ranges
between plus or minus half quantization level (LSB). This error is a
consequence ( and a measure) of the finite A/D converter resolution.
Furthermore, the quantization error can be considered as a noise if
all quantization levels are exercised with equal probability, the
quantization steps are uniform; a large number of quantization levels
are used, and thev quantization
error is not correlated with the input signal.
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