| 摘要 |
PROBLEM TO BE SOLVED: To variably set the number of bits of a digital signal upon AD conversion and reduce total power consumption in an AD converter. SOLUTION: The analog-digital converter includes a reference voltage generator 11 for generating a plurality of reference voltages, a plurality of comparators that input an analog signal and compare the voltage level of the analog signal with the reference voltage supplied from the reference voltage generator 11 on the basis of a sampling signal with a specified frequency so as to output a comparison result signal, an encoder 14 to output a digital signal having a specified number of bits wherein the comparison result signal output from the comparator is encoded; and a switch controller 15 that controls the operation of the specified comparator selected from the plurality of comparators in accordance with a requirement for outputting the number of bits of digital signal thus obtained. COPYRIGHT: (C)2011,JPO&INPIT
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