Patent ID: 7211993

Claim:
A bandgap voltage reference circuit including an amplifier having first and second input nodes, and providing a reference voltage at an output thereof, the circuit additionally including at least two pairs of transistors, each pair having a first transistor adapted to operate at a different current density to that of a second transistor of the pair, such that, in use, a difference in base emitter voltages, ΔV be , between the two transistors of each pairing is generated and wherein the pairs are arranged such that those transistors having a first current density are provided in a chain coupled to the first input node and those transistors having the second current density are provided in a chain coupled to the second input node, the combination of the ΔV be provided by each pairing contributing to an enhanced ΔV be at the output of the amplifier, the enhanced ΔV be being generated as a PTAT voltage across a single resistor coupled between the output of the amplifier and a reference potential.