A device includes an amplifying circuit having first and second input terminals and an output terminal, a ground terminal, a variable resistance circuit, and a resistance selecting circuit coupled in series to the variable resistance circuit between the output terminal and the ground terminal. The resistance selecting circuit includes a first node coupled to the second input terminal, a plurality of resistors coupled in series to each other and a plurality of gate circuits each coupled between the first node and one end of a corresponding one of the resistors.