DEVICE FOR GENERATING SECOND POWER SOURCE VOLTAGE FROM FIRST POWER SOURCE VOLTAGE, REFERENCE VOLTAGE GENERATOR, AND METHOD AND DEVICE FOR GENERATING DESIRED VOLTAGE

摘要

PROBLEM TO BE SOLVED: To provide a reference voltage generator for generating reference voltage being lower than power source voltage by quantity being selected previously. SOLUTION: A reference voltage source generates first reference voltage being higher than a ground potential by VREF. A first load element is coupled to a ground node, and generates an internal reference signal decided by magnitude of a current flowing in the first load element. A differential amplifier generates a signal decided by difference between a first input signal and a second input signal. A current adjusting switch has a control node coupled to an output of the differential amplifier, and it is coupled so that a current flowing in the first load element is decided. A second load element is coupled to the first load element in series and coupled to a power source node, its impedance is selected so that the second load element generates the second reference voltage.