A bandgap voltage reference circuit that can be implemented with low noise
characteristics is described. To achieve such low noise, a bandgap
reference circuit is provided that includes an amplifier coupled at its
inputs to first and second transistors respectively, the transistors
being arranged to generate a voltage representative of the base emitter
voltage differences between each of the first and second transistors
across a sensing resistor. The circuit additionally provides an
additional current to the sensing resistor to reduce the noise
contribution into the amplifier from the first transistor. Such a circuit
may be corrected for second order temperature effects by inclusion of a
temperature dependent current source.