Patent ID: 7606085

Claim:
A semiconductor device comprising: first and second resistor parts connected in series between a first power supply and a second power supply; an output node provided between the first and second resistor parts, a reference voltage being output via the output node; a feedback node provided between the first power supply and the first resistor part; and a voltage control circuit that maintains a voltage of the feedback node at a constant level by using the reference voltage of the output node and the voltage of the feedback node, wherein the voltage control circuit comprises a differential amplifier circuit that receives the reference voltage of the output node and the voltage of the feedback node, and a current control circuit that controls a current flowing between the first power supply and the feedback node by using an output of the differential amplifier circuit, wherein the current control circuit includes an FET having a gate connected to the output of the differential amplifier circuit and a source and a drain connected to the first power supply and the feedback node, respectively.