An Integrated Hall Sensor Platform Design for Position, Angle and Current Sensing

A new platform design of a Hall sensor uses digital signal processing and digital 3rd order temperature compensation. The improved architecture of the front-end achieves low noise of <2 muT in a bandwidth of 400 Hz by using a 3rd-order multibit continuous-time DeltaSigma-ADC. By chopping the first stage of this ADC a low magnetic offset of <50 muT is realized in a typical automotive operating temperature range from -50 to 150degC. A novel circuit technique for a stress sensor is used to compensate stress and aging effects in the Hall sensor. All required digital calculations are done at low power and area with a new intelligent state machine, which also provides various digital interface protocols.