Patent ID: 6737849
Filing Date: 2004-05-18
Classification: G05F,Y10S

Abstract:
A circuit for producing a current having a controllable temperature coefficient comprising:a current minor circuit for supplying from a first terminal of a power supply first and second currents; first and second bipolar transistors having collector connections which receive respective of said first and second currents from said current mirror, and having base connections connected to each other and to said first bipolar transistor collector connection; a first resistor connecting said bipolar transistors emitter connections together; a second resistor connecting one of said bipolar transistors emitter connections to a common terminal of said power supply, said resistors having a values of resistance selected to produce a bandgap voltage at said base connections having a positive temperature coefficient; and a current source connected to receive said bandgap voltage and produce a current having a positive temperature coefficient proportional to said bandgap voltage.