A new high-integrated weak field sensor for automotive applications

[摘要] Especially in the field of automotive applications smart sensor systems formagnetic field sensing face increasing requirements concerning low cost, lowpower consumption and high magnetic performance. Over the past years AMRsensors play a decisive role in this application area because of theirrobustness and stability. In the following a high-integrated smart sensorsystem for magnetic field sensing is presented. A novel approach for thedetection of weak magnetic fields is shown, which is based on anAC-excitation of AMR elements. In contrast to common used sensors thisconcept is based on a nonlinear AMR element without Barber pole construction.By means of this methodology sensitivity as well as temperature and life timestability is significantly improved, while the production costs compared tocommon-used sensors are reduced. Within this novel approach new signalconditioning algorithms and analog circuit topologies are presented, whichare able to meet low offset and low noise requirements.

[学科分类] 电子、光学、磁材料