An All CMOS Current Reference
In this paper, an all CMOS current reference circuit which generates a reference current independent of PVT (Process, supply Voltage, and Temperature) variations is presented. The circuit consists of a self-biased current source (SBCS) and two nested connected transistors which supply a voltage with positive temperature coefficient and the resulting reference circuit has low temperature coefficient. It is based on CSMC 0.5um mixed-signal process with the supply voltage of 5V. The precision of reference current is about ±3.05% when considering the process, supply voltage and temperature variation at the same time.
Robin G. Qiu and Yongfeng Ju
L. A. Li et al., "An All CMOS Current Reference", Applied Mechanics and Materials, Vols. 135-136, pp. 192-197, 2012