Patent ID: 7570040

Claim:
A voltage reference circuit comprising: a first transistor having a first active area, a first current carrying electrode, a second current carrying electrode, and a control electrode wherein the first active area is configured to form a first Vbe; a second transistor having a first current carrying electrode, a second current carrying electrode, a control electrode, and a second active area that is smaller than the first active area wherein the second active area is configured to form a second Vbe that is greater than the first Vbe; a first resistor coupled to receive a difference between the first Vbe and the second Vbe, the first resistor having first and second terminals; an operational amplifier having a first input coupled to the first current carrying electrode of the first transistor, a second input coupled to the first current carrying electrode of the second transistor, an output, and a third transistor coupled to receive signals from the second input; and a capacitor having a first terminal coupled to the output of the operational amplifier and a second terminal coupled to a current carrying electrode of the third transistor.