Reference voltage generation device

A reference voltage generation device, comprising:

• a constant current circuit configured to output a constant current in response to an input voltage;
• and
• a voltage generation circuit configured to generate a voltage based on the constant current,
• the constant current circuit comprising a first MOS transistor having a first channel size, a first gate electrode of a first conductivity type, a first source region of the first conductivity type, a first drain region of the first conductivity type, and a first channel impurity region of the first conductivity type,
• the voltage generation circuit comprising a second MOS transistor having a second channel size, a second gate electrode of a second conductivity type, a second source region of the first conductivity type, a second drain region of the first conductivity type, and a second channel impurity region of the first conductivity type, and
• the first channel size and the second channel size being different from each other, and the first channel impurity region and the second channel impurity region having different impurity concentrations.