Patent ID: 8278994

Claim:
An integrated circuit (IC) fabricated on a semiconductor substrate comprising: first and second bipolar transistors, the base and collector of the first bipolar transistor being coupled to the base of the second bipolar transistor; first and second resistors coupled in series between the emitter of the second bipolar transistor and a ground potential, the first and second resistors having first and second resistance values, R 1 and R 2 , and third and second temperature coefficients, TC 3 and TC 2 , respectively; a third resistor coupled between a node and the collector of the second bipolar transistor, a first current flowing through each of the first and second bipolar transistors, and the third resistor, when power is supplied to the IC, the third resistor having a third resistance value, R 3 , and the third temperature coefficient TC 3 , the first and second resistance values being such that the first current is substantially constant over temperature.