Highly tunable ultra-low temperature coefficient bandgap precision reference circuit

A circuit for providing a bandgap voltage reference, comprising:

• a first subcircuit that corresponds to a first voltage that is complementary to absolute temperature (CTAT);
• a second subcircuit that corresponds to a second voltage that is proportional to absolute temperature (PTAT);
• an operational amplifier that receives the first voltage of the first subcircuit and the second voltage of the second subcircuit, wherein a reference voltage is produced at an output of the operational amplifier based at least in part on the first voltage and the second voltage;
• one or more feedback resistors coupled to the output of the operational amplifier and the first subcircuit, coupled to the output of the operational amplifier and the second subcircuit, or a combination thereof;
• a biasing subcircuit coupled to the first subcircuit via a resistor, wherein the biasing subcircuit is substantially temperature independent and provides adjustments to a curvature of the reference voltage;
• the resistor coupled to the biasing subcircuit and the first subcircuit, wherein the resistor, in part, controls the curvature of the reference voltage;
• a bandgap device coupled to the biasing subcircuit and the resistor, the bandgap device providing an alternate path for current to flow in the circuit via the resistor, wherein the bandgap device, in part, flattens the curvature of the reference voltage;
• and
• an adjustable divider subcircuit coupled to the output of the operational amplifier, the first subcircuit, the second subcircuit, and the bandgap device, wherein the adjustable divider subcircuit provides non-temperature adjustments to the curvature of the reference voltage.