Patent ID: 8664932

Claim:
A voltage generating circuit, comprising: a range adjusting unit configured to output a code signal to adjust a range of an output voltage and to determine a magnitude of the output voltage to set a control code while an output range adjusting operation is performed, the range adjusting unit being configured to output the code signal in response to a data code received from the outside after the output range adjusting operation is complete; a digital analog converter configured to output a conversion voltage in response to the code signal; and an output unit configured to set an amplification gain thereof according to the control code and to amplify the conversion voltage according to the amplification gain to output the output voltage, wherein the output unit includes: a reference voltage generator configured to output a substantially constant voltage irrelative to a power supply as a reference voltage while the output range adjusting operation is performed, and configured to output a voltage generated in response to the power supply as the reference voltage after the output range adjusting operation is complete; and an amplifier configured to receive the conversion voltage and the reference voltage to output the output voltage according to the amplification gain.