Patent ID: 6690228
Filing Date: 2004-02-10
Classification: G05F

Abstract:
A bandgap reference circuit, comprising:a first current mirror comprising a first mirror transistor and a second mirror transistor; a holding circuit having an output adapted to control a current though the first current mirror by operating to maintain substantially equal the voltages at a first input thereof and at a second input thereof; a first bipolar transistor having an emitter, a base, and a collector, wherein the area of the emitter thereof has a predetermined size, arranged to conduct a collector current from the first mirror transistor; a second bipolar transistor having an emitter, a base, and a collector, wherein the area of the emitter thereof has a size that is proportional to the size of the emitter area of the first bipolar transistor, arranged to conduct a collector current from the second mirror transistor, the base thereof being connected to the collector thereof; a first resistor in series with the collector of the second bipolar transistor and the second mirror transistor; wherein the base of the first bipolar transistor is coupled to a common connection node of the first resistor and the second mirror transistor.