A current-mode back-end for a sensor microsystem

is paper presents a voltage-to-current converter as a current-mode output buffering stage for sensor interfaces. The converter can be used in any microsystem needing a current output. It is presented here in the context of a Hall sensor microsystem. The system is fully differential with an output stage that converts a discrete input voltage into a continuous current. The Hall sensor microsystem, using the voltage-to-current back-end, has been fabricated and measured in a 0.35 μm CMOS technology. The entire system performs with non-linearity lower than ±0.08% and maximum output current of ±3mA. © 2011 IEEE.