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Abstract

A comparison method includes: providing a successive approximation register analog-to-digital converter, where the successive approximation register analog-to-digital converter includes n−1 weighted capacitors, a charge transfer capacitor, and a comparator; sampling an differential input signal by using the first weighted capacitor and the charge transfer capacitor; importing the differential input signal stored on the charge transfer capacitor, where the differential input signal is transferred and redistributed on the charge transfer capacitor and n−2 other weighted capacitors than the first weighted capacitor, and completing the first time of comparison; and importing the differential input signal stored on the first weighted capacitor and the differential input signal stored on the charge transfer capacitor, importing a reference voltage by using the second to jth weighted capacitors, where the differential input signal and the reference voltage are transferred and redistributed on a capacitor array, and completing a jth time of comparison.

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First Claim