| 摘要 |
A reference voltage circuit is provided to enlarge the removing ratio of the supply voltage regulation is enlarged if the amplification degree of the differential amplification circuit is big, even if the power supply voltage of the power source terminal is decreased and the control transistor operates with unsaturated. A reference voltage circuit comprises an ED(Enhancement Depletion) type reference voltage circuit(50), a control transistor(70) and a differential amplification circuit(60). The ED type reference voltage circuit includes the depression type transistor and enhancement type transistor and outputs the reference voltage to the reference voltage output terminal(30). The control transistor supplies the internal power supply voltage to the ED type reference voltage circuit based on the power supply voltage of the power supply terminal. The differential amplification circuit inputs the reference voltage and the internal power supply voltage and outputs the control signal to the control transistor. The differential amplification circuit has the input offset voltage and controls the control transistor for maintaining the supply voltage of The ED type reference voltage circuit constantly.
|
