Patent ID: 8742746

Claim:
A band gap voltage reference device comprising: a first operational amplifier (op amp) having a negative input connected to a first diode reference, a positive input connected to a second voltage reference including a second diode, and an output; a voltage compensation network having an input connected to the first op amp output, a first output to supply current to the first diode reference, a second output to supply current to the second voltage reference, and a third output connected to a third voltage reference including a third diode, to supply band gap current having a constant band gap reference voltage across a first temperature range; and, a constant current circuit having a first output connected between the voltage compensation network and the first diode reference to supply a first current that is constant across the first temperature range, and the constant current circuit having a second output connected between the voltage compensation network and the second voltage reference to supply a second current that is constant across the first temperature range, wherein the constant current circuit is uncompensated for temperature variations.