Patent ID: 6906581

Claim:
A bandgap voltage reference circuit, said circuit comprising: a first current generator for generating a first reference current with positive temperature coefficient, said first current generator having a self-bias circuit, and a node which outputs a node voltage with negative temperature coefficient; a second current generator having a voltage-controlled current source receiving said node voltage for generating a second reference current with negative temperature coefficient according to the node voltage; and an output resistor accepting both the first reference current and the second reference current for outputting a bandgap voltage according to the first reference current and the second reference current; wherein the self-bias circuit further comprises: a first transistor having a first gate and a first drain; a second transistor having a second drain and a second gate, the second gate being coupled to the first gate; a first amplifier having a first input end, a second input end and an output end, said output end being coupled to both gates of the first and the second transistors, the first input end and the second input end being coupled to the drains of the first and the second transistors respectively; a third transistor having a third emitter thereof coupled to the first input end of the first amplifier; a first resistor coupled to the second input end of the first amplifier; and a fourth transistor having a fourth emitter thereof coupled to the first resistor, wherein the node is coupled to the fourth emitter of the fourth transistor.