| 摘要 |
There is disclosed an amplifier circuit providing a stable gain independently of fluctuations in power supply voltage, in which resistors (13, 14) and corrective switches (25, 26) having the same construction as analog switches (21 to 24) are provided in a feedback path from an output of an operational amplifier (1) to a negative input thereof, and in which resistors (15, 16) and corrective switches (27, 28) having the same construction as the analog switches (21 to 24) are provided in a reference voltage positive input path from a positive input of the operational amplifier (1) to a reference voltage (VR). An L level logical signal is applied to control inputs (C) of the corrective switches (25 to 28) and an H level logical signal is applied to control inputs (D) thereof. The corrective switches (25 to 28) are constantly set to an ON-state under the same conditions as the analog switches (21 to 24) in the ON-state.
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