| 摘要 |
PROBLEM TO BE SOLVED: To suppress offset even when the relevant offset occurs in the signal level of an input signal. SOLUTION: An offset cancel apparatus S1 is configured to complementarily change a resistance value between the inverted input terminal and the signal input terminal IN of an operational amplifier 20A for differential amplification circuit and a resistance value between the inverted input terminal and an output terminal, to gradually reduce the potential of an output signal Vout and to specify each resistance value in such a way that the potential becomes "0" finally, and carries out offset cancel using the resistance values. COPYRIGHT: (C)2008,JPO&INPIT
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