Patent ID: 7830291

Claim:
An analog-to-digital converter, comprising: a first range-control unit adapted to generate a first range-control value for controlling a size of an input range of the analog-to-digital converter; a second range-control unit adapted to generate a second range-control value for controlling an average value of a plurality of reference levels; a reference-level unit operatively connected to the first range-control unit and the second range-control unit, wherein the reference-level unit is arranged to generate the plurality of reference levels at least based on the first and the second range-control value; and a comparison unit operatively connected to the second range-control unit and the reference-level unit, wherein the comparison unit is arranged to perform at least one comparison between a difference between an analog input value of the analog-to-digital converter and the second range-control value and individual reference levels of the plurality of reference levels, and to generate a digital output value of the analog-to-digital converter based on the at least one comparison.