Externally Referenced Current Source With Stability Down to 1 nA/A at 50 mA

The noise and stability of a current source are limited by the quality of components used for construction, such as the voltage reference chips, resistors, and power supplies. A state-of-the-art commercial current source typically exhibits a stability no better than parts in 107. In this paper, we present a way to implement a current source with “external” electrical references. This approach allo...