Ernst Katzmaier

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.

Speed Sensors for Automotive Applications Based on Integrated GMR Technology

Magnetic sensors are widely used in modern cars for example as wheel speed sensors for ABS or to determine crank shaft position in motor management systems. Increasing demand for larger air gaps and better noise performance (lower jitter) requires sensor principles with higher sensitivities compared to the currently used devices. The presented approach with the monolithic integration of GMR (Giant-Magneto-Resistors) sensing elements on top of the signal conditioning ASIC provides a smart, single chip sensor solution which combines superior performance with high reliability.

Integrated Giant Magneto Resistors — a new Sensor Technology for Automotive Applications

The paper will give an introduction to the principle of the giant magneto resistive — GMR — effect and the silicon system integration of GMR sensors. The two main applications of a GMR are as a magnetic field strength sensor and as an angular field direction sensor. They will be discussed under consideration of automotive requirements.

Giant Magneto Resistors - Sensor Technology and Automotive Applications

The paper will give an introduction to the principle of the giant magneto resistive - GMR - effect and the silicon system integration of GMR sensors. The two main applications of a GMR as a magnetic field strength sensor and as an angular field direction sensor will be discussed under consideration of automotive requirements. The typical applications of a magnetic field strength GMR sensor in incremental position and speed sensing and those of GMR angular field sensors in position sensing will be summarized. Finally advantages of GMR in those applications will be discussed and conclusions on the use of GMR in automotive sensing will be drawn.