公开(公告)号：US20230119854A1

公开(公告)日：2023-04-20

申请号：US17905214

申请日：2021-02-22

Applicant: CROCUS Technology SA

Inventor： Anuraag Mohan ,  Robert Zucker

IPC: G01R33/09 ,  G01R33/00

Abstract: Disclosed is a MTJ sensing circuit for measuring an external magnetic field and including a plurality of MTJ sensor elements connected in a bridge configuration, the MTJ sensing circuit having an input for inputting a bias voltage and generating an output voltage proportional to the external magnetic field multiplied by the bias voltage and a gain sensitivity of the MTJ sensing circuit, wherein the gain sensitivity and the output voltage vary with temperature; the MTJ sensing circuit further including a temperature compensation circuit configured to provide a modulated bias voltage that varies as a function of temperature over a temperature range, such that the output voltage is substantially constant as a function of temperature. Also disclosed is a method for compensating the output voltage for temperature.

公开(公告)号：US20230134728A1

公开(公告)日：2023-05-04

申请号：US17905278

申请日：2021-02-22

Applicant: CROCUS Technology SA

Inventor： Robert Zucker ,  Scott Fritz

IPC: G01B7/30 ,  G01D5/14

Abstract: Magnetic sensor for measuring an external magnetic field angle in a two-dimensional plane, including: a first and second sensing unit outputting, respectively, a first signal sin(θ) and a second signal cos(θ); a first multiplying DAC receiving the first signal and a first digital input sin(f*t) and outputting a first modulated output signal; a second multiplying DAC receiving the second signal and a second digital input cos(f*t) and outputting a second modulated output signal; a first RC filter receiving the first modulated output signal and outputting a first filtered signal sin(θ)*sin(f*t+RCd); a second RC filter receiving the second modulated output signal and outputting a second filtered signal sin(θ)*sin(f*t+RCd); an adder adding the first and second filtered signals and outputting a summed signal cos(f*t+RCd+θ); and an angle extracting unit for measuring the phase delay between the summed signal and a synchronization signal and determining the angle from the phase delay.