low power switching successive approximation registerSAR analog-digital converterADC and analog-digital converting method using the same

摘要

A low power switching continuous approximation resistor analog-to-digital converter according to an embodiment of the present invention includes: a sampling and hold switch for sampling and holding an analog input voltage to a capacitor array including a plurality of capacitors; A digital-to-analog conversion unit including the capacitor array and outputting an analog comparison voltage; A comparator that receives the comparison voltage to a first input terminal and outputs a result of comparing the voltage of the first input terminal and the voltage of the second input terminal; And a successive approximation register logic unit that receives a comparison result output from the comparator, determines upper and lower bits, and controls the digital-to-analog converter to reset the comparison voltage. The digital-to-analog converter includes the capacitor array. It may include an array separation switch for separating the upper capacitor array and the lower capacitor array.