| 摘要 |
PROBLEM TO BE SOLVED: To provide an inverting amplifier circuit which can output a highly accurate result of amplification.SOLUTION: An inverting amplifier circuit 1 according to an embodiment, comprises: an operational amplifier OPA which amplifies a difference voltage between an input voltage supplied to an inverting input terminal and a reference voltage supplied to a non-inverting input terminal, and output a resultant amplified signal; a feedback resistance RFBT which provides a negative feedback of the amplified signal to the inverting input terminal of the operational amplifier OPA; and a variable resistance part PVIC1 which sets a current path of a first resistance value according to a control signal between an external input terminal INT and the inverting input terminal of the operational amplifier OPA, and sets a first alternative route of a second resistance value according to the control signal between a node on the current path and a reference voltage terminal GND to which the reference voltage is supplied.SELECTED DRAWING: Figure 3 |
