A method, system, and circuit for providing a bandgap voltage reference are provided. In an example, the method includes producing a first bandgap curve based at least in part on a first circuit, a second circuit, an operational amplifier, and one or more feedback resistors, where the first circuit corresponds to a first voltage that is complementary to absolute temperature (CTAT) and the second circuit corresponds to a second voltage that is proportional to absolute temperature (PTAT). The method also includes providing a temperature independent compensation to the first bandgap curve based at least in part on a bandgap device, a biasing circuit, and a resistor; providing a non-temperature compensation to the first bandgap curve based at least in part on an adjustable divider circuit; and generating a resulting bandgap curve from the first bandgap curve.

An electrical constant current circuit (CCC) in particular for supplying electrical power to a sensor, the circuit (CCC) including a power supply input terminal (INT), a constant current output terminal (OUT), a first transistor (TRF), and a shunt-type voltage reference (RVS), wherein the base of the first transistor (TRF) is biased by the shunt-type voltage reference (SVR) in series with the base-emitter junction of the second transistor (TRS), wherein the emitter of the first transistor (TRF) is connected to the power supply input terminal (INT) via a current set resistor (RST), wherein the collector of the first transistor (TRF) is connected to the output terminal (OUT) through a Schottky diode (SKD). For the improved temperature stability, initial accuracy, drop out voltage and power consumption embodiment provides that the circuit (CCC) includes a second transistor (TRS) in the line between the base of the first transistor (TRF) and the shunt-type voltage reference (SVR), wherein the second transistor's (TRS) base and collector are connected to the first transistor's (TRF) base.