Reference voltage generation circuit

A reference voltage generation circuit comprising:

• a current source;
• a Zener diode connected between the current source and a ground;
• and
• a current generation circuit connected to the Zener diode in parallel, the current generation circuit configured to generate a current having temperature dependence being directly proportional to absolute temperature, wherein:
• the current generation circuit includes:
• a resistance voltage divider circuit having a branch portion for branching the current into two paths, the resistance voltage divider circuit configured to output a reference voltage acquired by voltage division through a resistive element;
• a transistor circuit having two NPN transistors and a series resistance circuit in which a plurality of resistive elements are connected in series, respective collectors of the two NPN transistors being connected to the two paths, respective bases of the two NPN transistors being commonly connected, the series resistance circuit being connected between the ground and one of emitters of the two NPN transistors, another one of the emitters being connected to a common connection node shared by the plurality of resistive elements;
• and
• a voltage control circuit configured to equalize respective collector potentials of the two NPN transistors;
• and
• the reference voltage generation circuit further comprises:
• a semiconductor element having a PN junction, the semiconductor element located at a path between the current source and a terminal for outputting the reference voltage generated by the current generation circuit;
• and
• an additional current source, wherein
• the semiconductor element is an NPN transistor including
• a base connected to a branch node of the branch portion,
• an emitter outputting the reference voltage, and
• a collector connected to the additional current source.