| 摘要 |
PROBLEM TO BE SOLVED: To enhance circuit operation efficiency by decreasing the number of resetting times of the input offset voltage of a differential amplifier. SOLUTION: Switching elements (S2, S3) are connected in series between the output node (N3) and the inverted input node (N2) of a differential amplifier (OP), and a capacitive element (C1) is connected between the inverted input node N2 and a constant potential node. An offset voltage (VOS) is stored in the capacitive element through voltage follower operation of the differential amplifier. During amplification operation, the switching element (S2) being connected with the capacitive element is brought into noconductive state and the other conduction terminal of which is connected with a reference voltage source (VR) through a switching element (S24). COPYRIGHT: (C)2005,JPO&NCIPI
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