Patent ID: 7304466

Claim:
A voltage reference circuit comprising: a first reference current circuit including: first and second current-to-voltage converting circuits, each of which receives a current and converts the current to a voltage to output the so converted voltage; a first control circuit that exercises control in such a manner that an output voltage of said first current-to-voltage converting circuit and an output voltage of said second current-to-voltage converting circuit will be equal to each other; and a first current mirror circuit that supplies currents to respective ones of said first and second current-to-voltage converting circuits; said first current mirror circuit generating a current used for an output current of said first reference current circuit; a second reference current circuit including: third and fourth current-to-voltage converting circuits, each of which receives a current and converts the current to a voltage to output the so converted voltage; a second control circuit that exercises control in such a manner that an output voltage of said third current-to-voltage converting circuit and an output voltage of said fourth current-to-voltage converting circuit will be equal to each other; and a second current mirror circuit that supplies currents to respective ones of said third and fourth current-to-voltage converting circuits; said second current mirror circuit generating a current used for an output current of said second reference current circuit; a circuit that generates a difference current between the output current of said first reference current circuit and the output current of said second reference current circuit; and a fifth current-to-voltage converting circuit that converts the difference current to a voltage and outputs the so converted voltage as an output voltage of said voltage reference circuit.