Patent ID: 8779750

Claim:
A reference voltage generating circuit comprising: a reference voltage generating circuit element including a first diode characteristic element and a second diode characteristic element, a density of a current flowing through the second diode characteristic element being different from a density of a current flowing through the first diode characteristic element, the reference voltage generating circuit element being configured to output a reference voltage generated based on a difference between voltages respectively applied to the first diode characteristic element and the second diode characteristic element; a first adjusting circuit element configured to adjust a first-order temperature coefficient of the reference voltage; and a second adjusting circuit element configured to adjust a second-order temperature coefficient of the reference voltage, wherein: the second adjusting circuit element includes a current source configured to generate a current adjusted such that a second-order differential component of the reference voltage is canceled, the current source includes a first circuit element having such a diode characteristic that the current generated by the current source cancels the second-order differential component of the reference voltage, the first circuit element of the current source includes a bipolar transistor, the current source further includes a second circuit element and a current mirror circuit element, the second circuit element being configured to cause a current to flow between a collector and emitter of the first circuit element based on a current flowing through one of the first and second diode characteristic elements of the reference voltage generating circuit element, the current mirror circuit element being configured to receive a current flowing through a base of the first circuit element and output a correction current to a path of the reference voltage generating circuit element, and the current mirror circuit element is configured such that a current input to the reference voltage generating circuit element is adjusted by adjusting an input-output ratio of the current mirror circuit element.