SEMICONDUCTOR INTEGRATED CIRCUIT, VARIABLE GAIN AMPLIFIER, AND SENSING SYSTEM

A semiconductor integrated circuit includes a first pad provided on one end side of a first resistive element externally provided, a second pad provided on a different end side of the first resistive element, an operation amplifier, a first signal line wired between an output terminal of the operation amplifier and the first pad, a second signal line wired between one input terminal of the operation amplifier and the second pad, a first ESD (Electrostatic Discharge) protection element provided to the first signal line, and a third signal line, through which a voltage signal of the first pad is transmitted, the third signal line being connected to the first pad, and a second switch, which is selectively turned on, the second switch being provided on the third signal line.