Patent ID: 9141124
Filing Date: 2015-09-22
Classification: G05F

Abstract:
1. A bandgap reference circuit, comprising: first, second, and third current sources; an operational amplifier coupled to the first, second and the third current sources; a first bipolar transistor having a base, an emitter, and a collector, the emitter coupled to the first current source, the base and the collector coupled to a ground voltage; a voltage divider coupled between the emitter and the base of the first bipolar transistor, wherein the voltage divider provides first and second voltages proportional to a base-emitter voltage of the first bipolar transistor; a second bipolar transistor having a base, an emitter, and a collector, the base configured to receive the first voltage, the emitter coupled to the second current source, and the collector coupled to the ground voltage; a third bipolar transistor having a base, an emitter, and a collector, the base configured to receive the second voltage, and the collector coupled to the ground voltage; and a first resistor coupled between the third current source and the emitter of the third bipolar transistor.