Patent ID: 11892524
Assignee: ALLEGRO MICROSYSTEMS, LLC
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 11:
12. A method for processing a magnetic field signal with a magnetic field sensor, comprising:
generating, with a magnetic field sensing element, the magnetic field signal in response to a magnetic field;
modulating the magnetic field signal at a chopping frequency;
amplifying, with a front end amplifier, the magnetic field signal to generate an amplified signal;
demodulating the amplified signal at the chopping frequency;
filtering the amplified signal with a low pass filter to generate a low pass filtered signal; and
comparing, with a Schmitt trigger circuit, the low pass filtered signal to a reference signal a plurality of times within a chopping time period to generate a comparison signal, wherein the chopping time period is the inverse of the chopping frequency.