Angle Sensor And Method Of Measuring An Angle Of A Magnetic Field

An angle sensor configured to measure an angle α which describes a direction of a magnetic field in a plane, comprising

• a first magnetic field sensor having a first sensitivity direction, the first magnetic field sensor having two current terminals and two voltage terminals,
• a second magnetic field sensor having a second sensitivity direction, the second magnetic field sensor having two current terminals and two voltage terminals,
• a first current source supplying a first biasing current I1 to the current terminals of the first magnetic field sensor,
• a second current source supplying a second biasing current I2 to the current terminals of the second magnetic field sensor, and
• electronic circuitry forming a closed control loop configured to rotate a sensitivity direction of the angle sensor by changing the biasing currents I1 and I2 until a signal U equals 0 and to determine the angle α from the sensitivity direction of the angle sensor when the signal U equals 0,
• wherein either the voltage terminals of the first and second magnetic field sensor are connected in series and the voltage appearing over the series connected voltage terminals is tapped and amplified to deliver the signal U, or the voltage terminals of the first and second magnetic field sensor are connected in parallel and the voltage appearing at the parallel connected voltage terminals is tapped and amplified to deliver the signal U, or wherein the angle sensor comprises a first amplifier coupled to the voltage terminals of the first magnetic field sensor, a second amplifier coupled to the voltage terminals of the second magnetic field sensor and a summing junction coupled to the outputs of the first and second amplifier and having an output delivering the signal U.