Patent ID: 7999606
Filing Date: 2011-08-16
Classification: G05F

Abstract:
1. 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, a size ratio of the emitter of the second bipolar transistor to the emitter of the first bipolar transistor being equal to N, where N is an integer greater than 1, the emitter of the first bipolar transistor being coupled to a ground potential; first and second resistors coupled in series between the emitter of the second bipolar transistor and the ground potential, the first and second resistors having first and second resistance values, R a current mirror coupled to the first and second bipolar transistors such that a first current flows through each of the first and second bipolar transistors when power is supplied to the IC, the first and second resistance values being such that a temperature coefficient of a difference between the base-emitter voltages of the first and second bipolar transistors, TC resulting in the first current being substantially constant over temperature.