Patent ID: 11883115
Assignee: NORTHERN DIGITAL INC.
Field: Medical technology (Instruments)
Classification: CPC A  G | IPC A  G

Claim 12:
13. A magnetic tracking device comprising:
a sensor configured to generate a sensor electromotive force (EMF) that measures a magnetic field that is generated by a magnetic field transmitter;
a mechanism configured to adjust a sensitivity of the sensor between a higher EMF state of the sensor EMF and a lower EMF state of the sensor EMF;
an interconnecting circuit configured generate a parasitic EMF when receiving the magnetic field;
wherein the interconnecting circuit is configured to connect to a processing device, the processing device configured to:
receive a first measurement representing the higher EMF state of the sensor EMF and the parasitic EMF;
receive a second measurement representing the lower EMF state of the sensor EMF and the parasitic EMF;
compare the first measurement and the second measurement; and
based on comparing the first measurement and the second measurement, determine an approximate value of the sensor EMF,
wherein the mechanism comprises a diode in parallel with the sensor, the diode configured to be reverse biased in a first operating mode and configured to be forward biased in a second operating mode.