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Real world parameters such as temperature, light intensity, and others are continuous in time and infinite in resolution. For digital processing, the analog signal must be converted to a digital code of fixed length, by process called ‘quantization’, at discrete time intervals, by a process called ‘sampling’. This quantization error sets the threshold beyond which the analog-to-digital converter (ADC) cannot distinguish or resolve the signal anymore. Hence, this is the noise level of an ideal ADC determined by the resolution of conversion.