Reference voltage circuit and electronic circuit

A reference voltage circuit for generating a reference voltage, comprising:

• a predetermined line;
• a first resistor and a first pn junction device that are provided between the predetermined line and a ground, the first pn junction device being connected in series with the first resistor;
• a second resistor, a third resistor, and a second pn junction device that are provided between the predetermined line and the ground, the third resistor being connected in series with the second resistor, the second pn junction device being connected in series with the third resistor;
• a first capacitor and a second capacitor;
• a voltage output circuit configured to operate repeatedly with a predetermined frequency, which corresponds to a predetermined period that includes a first time period and a second time period, by
• amplifying a first voltage at a first node, at which the first resistor and the first pn junction device are connected, for the first time period, to thereby output a first resultant voltage to the first capacitor, and
• amplifying a second voltage at a second node, at which the second resistor and the third resistor are connected, for the second time period, to thereby output a second resultant voltage to the second capacitor;
• and
• a first amplifier circuit configured to amplify a difference between a voltage at the first capacitor and a voltage at the second capacitor, wherein
• the reference voltage is generated corresponding to a voltage outputted by the first amplifier circuit, and is applied to the predetermined line.