Reference voltage generator

A reference voltage generator, comprising:

• a reference voltage source that generates a direct-current voltage that is used as a reference;
• a low-pass filter that is connected to an output node of the reference voltage source;
• a voltage buffer circuit that subjects an output of the low-pass filter to impedance conversion to be outputted;
• a first switching element that is inserted between an output node of the low-pass filter and an input terminal of the voltage buffer circuit;
• a second switching element that is inserted between the output node of the low-pass filter and an output terminal of the voltage buffer circuit;
• a third switching element that is inserted between the output node of the reference voltage source and the input terminal of the voltage buffer circuit;
• and
• a hysteresis comparator with one input terminal to which an output of the reference voltage source is connected and another input terminal to which an output of the low-pass filter is connected,
• wherein the first to third switching elements are controlled based on an output signal of the hysteresis comparator so as to be switched between a state where the first switching element is on and the second and third switching elements are off and a state where the first switching element is off and the second and third switching elements are on.