Patent ID: 7605578
Filing Date: 2009-10-20
Classification: G05F

Abstract:
1. A bandgap voltage reference circuit configured to provide a voltage reference at an output thereof, the circuit including an amplifier coupled to first and second transistors respectively, the amplifier having inverting and non-inverting inputs, the transistors being configured to generate a voltage indicative of a base-emitter voltage difference between each of the first and second transistors across a sensing resistor, wherein the base of the first transistor is coupled to the non-inverting input of the amplifier and the collector of the first transistor is coupled to the inverting input of the amplifier, the second transistor in a diode-configuration, and the circuit provides an additional current to the sensing resistor from a diode-connected third transistor, to reduce the contribution of noise from the first transistor into the amplifier.