Quantization error is the difference between the analog signal and the closest available digital value at each sampling instant from the A/D converter. Quantization error also introduces noise, called quantization noise, to the sample signal. ... S/N is the signal to noise and is expressed in dB.

What causes quantization error?

Error resulting from trying to represent a continuous analog signal with discrete, stepped digital data. The problem arises when the analog value being sampled falls between two digital “steps.” When this happens, the analog value must be represented by the nearest digital value, resulting in a very slight error.

What is quantization error in DAC?

The resolution of a DAC is specified by the number of its input bits. ... The vertical distance between the two traces at the sampling instants is the error introduced by the DAC as a result of its finite resolution. This error is known as quantization error and gives rise to an effect known as quantization distortion.