A trimming circuit is disclosed. The trimming circuit includes a first trimming circuit having resistors and fuses, and a second trimming circuit having a resistor, an NMOS transistor, and a control circuit. The control circuit includes an inverter circuit and a series circuit in which a resistor and fuses are connected in series. The first trimming circuit is connected with a reference resistor in series and the second trimming circuit is connected with the reference resistor in parallel.