On-chip reference current and voltage generating circuits

An on-chip reference voltage driving circuit having an output terminal for outputting a reference voltage, the circuit comprising:

• an amplifier for comparing the reference voltage, which is input to a first input terminal, and an input voltage input to a second input terminal and outputting the result of the comparison to the output terminal of the amplifier;
• an on-chip capacitor connected between the output terminal of the amplifier and the output terminal of the on-chip reference voltage driving circuit;
• and
• a common source amplifier for outputting the reference voltage to the output terminal of the on-chip reference voltage driving circuit in response to a signal output from the amplifier.

An on-chip reference voltage generating circuit having an output terminal for outputting a reference voltage, the circuit comprising:

• a level shifter for generating a second voltage by shifting the level of a first voltage in response to the first voltage;
• and
• a voltage driving circuit for driving the second voltage to the reference voltage in response to an enable signal,
• wherein the voltage driving circuit comprises:
• an amplifier for comparing the reference voltage input to its first input terminal and the second voltage input to its second input terminal, and outputting the result of the comparison to its output terminal;
• an on-chip capacitor connected between the output terminal of the amplifier and the output terminal of the on-chip reference voltage generating circuit;
• and
• a common source amplifier for driving the reference voltage to the output terminal of the on-chip reference voltage generating circuit in response to a signal output from the amplifier.

An integrated circuit comprising:

• a summing circuit for receiving a first current, which increases in proportion to temperature, and a second current, which decreases in inverse proportion to temperature, and outputting a third current that is a sum of the first and second currents;
• a digital calibration circuit for calibrating the third current with reference to a predetermined reference current in response to a digital control signal and outputting a reference current;
• and
• an internal reference voltage generating circuit for receiving the reference current and generating an internal reference voltage corresponding to the reference current.

An integrated circuit comprising:

• a first current generating circuit for generating a first current that decreases in inverse proportion to temperature;
• a second current generating circuit for generating a second current that increases in proportion to temperature;
• a generator circuit for generating a third current based upon the first and second currents;
• and
• a digital calibration circuit for calibrating an offset between the third current and the reference current with reference to a predetermined reference current in response to a digital control signal input from the outside, and outputting the calibrated reference current.