Circular Hall transducer for angular position sensing

We developed a new integrated magnetic sensor based on the Hall effect, suitable for the application in magnetic contactless 360° absolute angle sensors. The device consists of a narrow n-well ring with a chain of 64 contacts equally distributed around the ring. The contacts are connected to an on-chip electronics with biasing and signal conditioning circuits providing the information about the magnitude and phase of in-plane component of the magnetic field. We characterized the sensor in homogenous magnetic field of 100 mT and measured the angular resolution of 0.01° in the frequency bandwidth of 1 kHz and the absolute angular accuracy of about 1° and 0.1° without and with output offset calibration of the sensor, respectively.