Improving Resolution of SAR ADC
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.