CURRENT source with controlled power supply voltage

This work presents examination of a novel current source circuit. The implementation of a linear combination of two reference voltages and a voltage drop across a load resistor to control a power supply voltage in a typical bipolar current source allows limitation of the correlation between the output stage collector-emitter voltage and the load current, resistance. The first reference voltage, V-ref1, controls the load current, while the second reference voltage, V-ref2, controls the output stage emitter-collector voltage. Consequently, this voltage is independent of the load current and resistance, which is particularly important for reducing the influence of Early effect. The presented circuit is characterized by a simple design and relatively low cost.