Patent ID: 9404991
Filing Date: 2016-08-02
CPC Classification: G01R

Claim Text:
1. Magnetic field sensor including a magnetic field sensing circuit comprising a reference magnetic field generator and a magnetic field sensing cell, and a signal processing circuit connected to the output of the magnetic field sensing cell and comprising a gain correction feedback circuit for correcting fluctuations in the transfer characteristic of the magnetic field sensor, the sensor further comprising a reference current generator configured to generate a reference current I ref , the reference current generator connected to the magnetic field sensing circuit configured for generating the reference magnetic field B ref and to the gain correction feedback circuit, the gain correction feedback circuit comprising a demodulator configured to generate a reference output signal y out _ ref that is an image of the reference magnetic field B ref , the gain correction feedback circuit further comprising a comparator configured to compare said reference output singal y out _ ref to a signal f(I ref ) based on the reference current I ref .