Patent ID: 8710912

Claim:
A bandgap voltage reference circuit configured to provide a voltage reference at an output thereof, the circuit comprising: a first set of circuit elements, including at least one bi-polar transistor and a first resistor connected to an emitter of the at least one bi-polar transistor, the first set of circuit elements arranged to provide a complimentary to absolute temperature (CTAT) voltage or current; a second set of circuit elements, the second set of circuit elements arranged to provide a proportional to absolute temperature (PTAT) voltage or current, such that at absolute zero temperature its polarity is opposite to that of the complementary to absolute temperature voltage or current provided by the first set of circuit elements; and a third set of circuit elements, including an amplifier and a second resistor that provides a feedback path between an output and an input of the amplifier, the amplifier arranged to combine the CTAT voltage or current with the PTAT voltage or current so as to generate the voltage reference; wherein a ratio of a resistance of the first resistor to a resistance of the second resistor is selected to compensate for first order errors of the voltage reference, and a ratio of a temperature at which a current through the emitter of the at least one bi-polar transistor is zero to room temperature is determined, as a function of the ratio of the resistance of the first and the second resistors, to compensate for second order errors of the voltage reference, so that the first and second order errors of the voltage reference are simultaneously compensated.