| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem wherein there is the case where the characteristics of a transistor used for the input change with time in a conventional comparator using a differential input stage or the like and it is difficult for the comparator to maintain accurate operation. SOLUTION: A comparator circuit relating to an embodiment has: a comparator comparing voltages inputted to first and second input terminals and outputting a comparison result signal corresponding to a comparison result; an input switching circuit inputting a reference voltage and an input signal and outputting the reference voltage to one of the first and second input terminals while outputting the input signal to the other of the first and second input terminals according to a switching signal; an output inverting/noninverting circuit outputting the comparison result signal after inverting or not inverting the signal according to the switching signal; and a timer measuring the operation time of the comparator and outputting the switching signal according to the operation time. COPYRIGHT: (C)2006,JPO&NCIPI
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