US 11,307,267 B1 · Hall sensor analog front end

Abstract

A system includes a first amplifier and a first Hall sensor group coupled to the first amplifier. The system includes a second amplifier and a second Hall sensor group coupled to the second amplifier, where the second Hall sensor group includes a spinning Hall group. The system includes a first demodulator, where the first demodulator input is coupled to the first amplifier output. The system includes a second demodulator, where the second demodulator input is coupled to the second amplifier output. The system also includes a subtractor, the first subtractor input coupled to the first demodulator output, and the second subtractor input coupled to the second demodulator output. The system includes a filter coupled to the subtractor output and to a second input of the first amplifier, and a calibration module coupled to the subtractor output.

Claims25

Dependent claims

A system, comprising:

a first amplifier having a first amplifier output and first and second inputs;
a first Hall sensor group coupled to the first input of the first amplifier;
a second amplifier having a second amplifier output and a third input;
a second Hall sensor group coupled to the third input, wherein the second Hall sensor group includes a spinning Hall group;
a first demodulator having a first demodulator output and a first demodulator input, the first demodulator input coupled to the first amplifier output;
a second demodulator having a second demodulator output and a second demodulator input, the second demodulator input coupled to the second amplifier output;
a subtractor having a subtractor output and first and second subtractor inputs, the first subtractor input coupled to the first demodulator output, and the second subtractor input coupled to the second demodulator output;
a filter coupled to the subtractor output and to the second input of the first amplifier;
and
a calibration module coupled to the subtractor output.

7 more elements

A system, comprising:

a first Hall sensor group configured to provide a first Hall sensor signal responsive to an applied magnetic field;
a second Hall sensor group configured to provide a second Hall sensor signal responsive to the applied magnetic field, wherein the second Hall sensor group includes a spinning Hall group;
a first amplifier coupled to the first Hall sensor group and configured to provide a first amplified signal responsive to the first Hall sensor signal;
a second amplifier coupled to the second Hall sensor group and configured to provide a second amplified signal responsive to the second Hall sensor signal;
a first demodulator coupled to the first amplifier and configured to provide a first demodulated signal responsive to the first amplified signal;
a second demodulator coupled to the second amplifier and configured to provide a second demodulated signal responsive to the second amplified signal;
a third amplifier coupled to the first demodulator and the second demodulator, and configured to provide a subtracted output signal responsive to a difference between the first demodulated signal and the second demodulated signal;
a filter coupled to an output of the third amplifier and configured to provide an offset correction signal to the first amplifier responsive to the subtracted output signal;
and
a calibration module coupled to the output of the third amplifier and configured to provide a calibration signal responsive to the subtracted output signal, wherein the calibration signal is configured to calibrate a bias current source coupled to the first Hall sensor group.

7 more elements

Dependencies are inferred from the claim text.

Hall sensor analog front end

Life of this patent

Hall sensor analog front end

Life of this patent

Abstract

Claims25