Integrated circuit using bias current, bias current generating device, and operating method for the same

A bias current generating device comprising:

• an electrical fuse configured to store a calibration code;
• a first amplifier configured to receive a reference voltage and a first voltage, and to amplify a difference between the first voltage and the reference voltage to output a first output voltage;
• a first bias current generator configured to receive the first output voltage, and to output a first bias current in response to the first output voltage;
• a variable resistor configured to receive the first bias current from the first bias current generator, to receive the calibration code from the electrical fuse, and to output the first voltage in response to the first bias current and the calibration code;
• a second bias current generator configured to receive the first output voltage, and to output a second bias current to a peripheral circuit in response to the first output voltage;
• a third bias current generator configured to receive the first output voltage, and to output a third bias current to an external device through a pad in response to the first output voltage;
• a second amplifier configured to receive the reference voltage and a second voltage, and to amplify a difference between the second voltage and the reference voltage to output a second output voltage;
• a fourth bias current generator configured to receive the second output voltage, and to output a fourth bias current in response to the second output voltage;
• a first resistor configured to receive the fourth bias current from the fourth bias current generator, and to output the second voltage in response to the fourth bias current;
• and
• a fifth bias current generator configured to receive the second output voltage, and to output a fifth bias current to the peripheral circuit in response to the second output voltage.