A CMOS Current-Mode Magnetic Hall Sensor With Integrated Front-End

TLDR

The paper presents a current‑domain Hall magnetic sensor and its electronic interface. The sensor and its high‑sensitivity front‑end were designed and fabricated in 0.18‑µm CMOS, employing current‑spinning to cancel offset and deliver a differential current output. The device consumes 120 µW and exhibits a residual offset of 50 µT.

Abstract

A Hall magnetic sensor working in the current domain and its electronic interface are presented. The paper describes the physical sensor design and implementation in a standard CMOS technology, the transistor level design of its high sensitive front-end together with the sensor experimental characterization. The current-mode Hall sensor and the analog readout circuit have been fabricated using a 0.18- μm CMOS technology. The sensor uses the current spinning technique to compensate for the offset and provides a differential current as an output signal. The measured sensor power consumption and residual offset are 120 μW and 50 μT, respectively.