Hi All,
I have a basic question regarding Hall plates for a course I am taking. (I understand the basic operation of a Hall plate using a constant DC current source across the current pads to sense a perpendicular magnet field). However, I have a task of investing what is the behavior of a typical Hall plate if you apply AC constant current source instead of a DC constant current.
Can anyone comment on the behavior of this say applying 10Hz or 100Hz? Would you just see a periodic Hall voltage in response to your MF? Would it still be a linear relationship? Would the output be usable? What would be the typical highest input frequency this device could sustain?
Will the resulting magnetic flux from your alternating current input interact with the magnetic field you are trying to sense?
Since you typically use high input currents to sense small magnetic fields, I would think that any AC current input with a large magnitude would either desensitize your sensor or possibly interact with the very device your are trying to sense?
Are there any applications where you could use an AC input current source? Or is this strictly a DC current driven device?
Thank you for your input.
Michael.