Stray field suppression in magnetic sensor Wheatstone bridges

A magnetic sensor, comprising:

• a bridge circuit comprising a plurality of magnetic field sensor elements, each configured to generate a sensor signal in response to the magnetic field impinging thereon, wherein the bridge circuit is configured to generate a differential signal based on sensor signals generated by the plurality of magnetic field sensor elements,
• wherein the bridge circuit further comprises a plurality of resistors, wherein each of the plurality of magnetic field sensor elements is coupled in parallel to at least one resistor of the plurality of resistors,
• wherein the bridge circuit further comprises a first plurality of parallel branches including a first plurality of resistors of the a plurality of resistors and a first plurality of switches, wherein each parallel branch of the first plurality of parallel branches includes a corresponding first resistor of the first plurality of resistors and a corresponding first switch of the first plurality of switches, and wherein each parallel branch of the first plurality of parallel branches is switchably coupled in parallel to a different one of the plurality of magnetic field sensor elements based on a switching state of the corresponding first switch, and the magnetic sensor further comprises:
• a controller configured to transmit control signals to the bridge circuit for controlling switching states of the first plurality of switches.

A magnetic sensor module, comprising:

• a magnet configured to produce a differential magnetic field, the differential magnetic field having a first differential field portion and a second differential field portion;
• and
• a bridge circuit comprising a plurality of magnetic field sensor elements, including a first pair of sensor elements disposed in the first differential field portion and a second pair of sensor elements disposed in the second differential field portion, wherein the bridge circuit is configured to generate a differential signal based on sensor signals generated by the plurality of magnetic field sensor elements,
• wherein the bridge circuit further comprises a plurality of resistors that are insensitive to magnetic fields, wherein each of the plurality of magnetic field sensor elements is coupled in parallel to at least one resistor of the plurality of resistors.

A magnetic sensor module, comprising:

• a magnet configured to produce a differential magnetic field, the differential magnetic field having a first differential field portion and a second differential field portion;
• and
• a bridge circuit comprising a plurality of magnetic field sensor elements, including a first pair of sensor elements disposed in the first differential field portion and a second pair of sensor elements disposed in the second differential field portion, wherein the bridge circuit is configured to generate a differential signal based on sensor signals generated by the plurality of magnetic field sensor elements,
• wherein the bridge circuit further comprises a plurality of resistors, wherein each of the plurality of magnetic field sensor elements is coupled in parallel to at least one resistor of the plurality of resistors,
• wherein the bridge circuit further comprises a first plurality of parallel branches including a first plurality of resistors of the plurality of resistors and a first plurality of switches, wherein each parallel branch of the first plurality of parallel branches includes a corresponding first resistor of the first plurality of resistors and a corresponding first switch of the first plurality of switches, and wherein each parallel branch of the first plurality of parallel branches is switchably coupled in parallel to a different one of the plurality of magnetic field sensor elements based on a switching state of the corresponding first switch, and the magnetic sensor module further comprises:
• a controller configured to transmit control signals to the bridge circuit for controlling switching states of the first plurality of switches.