Voltage generation circuits are provided. The voltage generation circuit includes a reference voltage generator suitable for generating a reference voltage signal having a constant level without a correspondence to a temperature variation. A comparator suitable for comparing a first drivability controlled by a level of the reference voltage signal with a second drivability controlled by a level of a comparison voltage signal to generate a comparison signal. A voltage controller may be configured to generate the comparison voltage signal whose level continuously increases until the comparison signal is enabled.