Patent ID: 8680839

Claim:
A bandgap reference voltage source comprising: an output resistor; first and second transistors having collectors connected to a common return and bases connected to a first terminal of the output resistor; a differential amplifier having a positive input, a negative input, a positive output and a negative output; a positive-input calibration phase switch in communication with the positive amplifier input, a emitter of the first transistor, and a emitter of the second transistor; a negative-input calibration phase switch in communication with the negative amplifier input, the emitter of the first transistor, and the emitter of the second transistor; a positive-output calibration phase switch in communication with the positive amplifier output, the first terminal of the output resistor, and a second terminal of the output resistor; a negative-output calibration phase switch in communication with the negative amplifier output, the first terminal of the output resistor, and the second terminal of the output resistor; and an adjustable resistance in communication with the emitter of the first transistor, the emitter of the second transistor, and the second terminal of the output resistor.