REFERENCE VOLTAGE GENERATING CIRCUIT AND SEMICONDUCTOR ELEMENT HAVING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a reference voltage generating circuit which operates with lower voltage than a band gap voltage and low-power consumption and generates high precision reference voltage. Ž

SOLUTION: The difference voltage VSwhich has a positive temperature dependency is converted into the second current I2, by performing feeding back using the differential amplifier A1 so as to apply a same voltage to both ends of the first diode Da and to the point between the second diode Db and the first resistor R1which are series-connected. The forward voltage which has a negative temperature dependency is converted into the third current I3, by connecting the third resistor R3Ato the second diode Db and connecting the fourth resistor R3Bto the first diode Da. Then, the first current I1which has no temperature dependencies is generated by combining the second current I2and the third current I3. Further, the output voltage Vout is generated by connecting the third resistor R3Aand the fourth resistor R3Bto the output node N3 and by flowing a current I1+I3×2 through the second resistor R2. Ž

COPYRIGHT: (C)2010,JPO&INPIT Ž