Hall microsystem with continuous digital gain calibration

Abstract

The gain drift of integrated Hall sensors is one of their current main limitations. The drift is due to temperature variations, mechanical stresses and ageing. The technique presented in this chapter allows a continuous cancellation of the gain drift using a real-time digital calibration system. The detection and compensation circuit uses the digital correction techniques and methodology presented in the previous chapters. The proposed system allows a gain drift reduction by a factor of 6 to 10 compared to current commercial products.