| 摘要 |
PURPOSE: A reference voltage circuit is provided to suppress the change and curvature of the slope of a reference voltage to a temperature by generating the reference voltage through addition of the differential voltage of a threshold voltage in an enhancement NMOS transistor and the threshold voltage of a depression NMOS transistor. CONSTITUTION: In a reference voltage circuit, the gate of a first depression NMOS transistor(11) is connected to the gate of a second depression type NMOS transistor(12). The source of a second depression type NMOS transistor is connected to a second terminal. The drain of the first NMOS transistor(14) is connected to a first terminal. The source of the first NMOS transistor is connected to a ground terminal. The gate of the second NMOS transistor(15) is contacted with the drain, the gate of the first NMOS transistor, and a second terminal. The source of the second NMOS transistor is connected to the reference voltage output terminal. The second NMOS transistor has a threshold voltage lower than the that of the first NMOS transistor. The voltage generating circuit generates the reference voltage between the reference voltage output terminal and the ground terminal. |
