REFERENCE VOLTAGE GENERATION CIRCUIT, OSCILLATION CIRCUIT INCLUDING THE SAME AND METHOD FOR CALIBRATING OSCILLATION FREQUENCY OF OSCILLATION CIRCUIT

摘要

A reference voltage generation circuit has: a first PN junction element; a second PN junction element having a higher forward direction voltage than the first PN junction element; a first differential amplifier inputting an anode of the first PN junction element and a first connection node between a first and a second resistor disposed in series between a first output of the first differential amplifier and a first potential, and generating a first output voltage at the first output; and a second differential amplifier inputting an anode of the second PN junction element and a second connection node between a fourth and a third resistor disposed in series between a second output of the second differential amplifier and the first output of the first differential amplifier, and generating a reference voltage at the second output. A resistance ratio between the third and the fourth resistors is variable.