Patent ID: 8044708

Claim:
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 first voltage buffer circuit with an input terminal to which the output node of the reference voltage source is connected and an output terminal to which an output node of the low-pass filter is connected, which has a voltage gain of one time; and a hysteresis comparator with one input terminal to which the output node of the reference voltage source is connected and the other input terminal to which the output node of the low-pass filter is connected, wherein at start-up, during a time period in which a voltage difference between an output of the reference voltage source and an output of the low-pass filter exceeds a predetermined value, the first voltage buffer circuit is controlled to be in a low output impedance state based on an output signal of the hysteresis comparator.