Abstract: A magnetic field sensor includes a first coil responsive to a first AC coil drive signal having a first frequency, a magnetic field sensing element responsive to a sensing element drive signal and configured to simultaneously detect a directly coupled magnetic field generated by the first coil and a reflected magnetic field generated by an eddy current induced in a conductive target by the first coil, the conductive target disposed proximate to the magnetic field sensing element, the magnetic field sensing element further configured to generate a magnetic field signal, a second coil responsive to a second AC coil drive signal having a second frequency that is the same as the first frequency and current sensing circuitry configured to measure a magnitude of the second AC coil drive signal that causes the magnetic field signal to be approximately zero.

Abstract: A system for suppressing low frequency magnetic noise from magnetoresistive sensors, the system including at least one magneto-resistive sensor including a free magnetic layer having a variable magnetisation, and a system for modifying magnetisation of the free magnetic layer, wherein the system for modifying magnetisation of the free layer is adapted to drive dynamics of the magnetisation of the free magnetic layer.

Abstract: A magnetic field sensor includes at least one coil responsive to an AC coil drive signal; at least one magnetic field sensing element responsive to a sensing element drive signal and configured to detect a directly coupled magnetic field generated by the at least one coil and to generate a magnetic field signal in response to the directly coupled magnetic field; a processor responsive to the magnetic field signal to compute a sensitivity value associated with detection of the directly coupled magnetic field and substantially independent of a reflected magnetic field reflected by a conductive target disposed proximate to the at least one magnetic field sensing element; and an output signal generator configured to generate an output signal of the magnetic field sensor indicative of the reflected magnetic field.

Abstract: A magnetoresistive stack includes a reference layer including a magnetic layer, an antiferromagnetic layer in exchange coupling with the magnetic layer, a magnetic layer substantially of the same magnetisation as the magnetic layer, a spacer layer between the magnetic layers with a thickness for enabling an antiferromagnetic coupling between the magnetic layers of a first coupling intensity, a free layer having a coercivity of less than 10 microTesla, the free layer including a magnetic layer, an antiferromagnetic layer in exchange coupling with the magnetic layer, a magnetic layer substantially of the same magnetisation as the magnetic layer, a spacer layer between the magnetic layers with a thickness for enabling an antiferromagnetic coupling between the magnetic layers of a second coupling intensity lower than the first coupling intensity, a third spacer layer separating the reference and free layers.

Abstract: A magnetic field sensor includes at least one coil responsive to an AC coil drive signal; at least one magnetic field sensing element responsive to a sensing element drive signal and configured to detect a directly coupled magnetic field generated by the at least one coil and to generate a magnetic field signal in response to the directly coupled magnetic field; a processor responsive to the magnetic field signal to compute a sensitivity value associated with detection of the directly coupled magnetic field and substantially independent of a reflected magnetic field reflected by a conductive target disposed proximate to the at least one magnetic field sensing element; and an output signal generator configured to generate an output signal of the magnetic field sensor indicative of the reflected magnetic field.

Abstract: A magnetic field sensor includes at least one coil responsive to an AC coil drive signal; at least one magnetic field sensing element responsive to a sensing element drive signal and configured to detect a directly coupled magnetic field generated by the at least one coil and to generate a magnetic field signal in response to the directly coupled magnetic field; a processor responsive to the magnetic field signal to compute a sensitivity value associated with detection of the directly coupled magnetic field and substantially independent of a reflected magnetic field reflected by a conductive target disposed proximate to the at least one magnetic field sensing element; and an output signal generator configured to generate an output signal of the magnetic field sensor indicative of the reflected magnetic field.

Abstract: A system for suppressing low frequency noise of magnetoresistive sensors, includes a device for measuring a magnetic field, the device including at least one magnetoresistive sensor, the magnetoresistive sensor having a first sensitivity at a first operating point and a second sensitivity at a second operating point, the sensitivity at the second operating point being low or zero; a modulator configured to switch the at least one magnetoresistive sensor from the first operating point to the second operating point; and a signal processor for processing the signal derived from the device for measuring a magnetic field.

Abstract: A system for suppressing low frequency noise of magnetoresistive sensors, includes a device for measuring a magnetic field, the device including at least one magnetoresistive sensor, the magnetoresistive sensor having a first sensitivity at a first operating point and a second sensitivity at a second operating point, the sensitivity at the second operating point being low or zero; a modulator configured to switch the at least one magnetoresistive sensor from the first operating point to the second operating point; and a signal processor for processing the signal derived from the device for measuring a magnetic field.

Abstract: Methods and apparatus for providing data transfer with a drive coil to transmit information, a receive coil magnetically coupled to the drive coil, and a first magnetoresistive sensor proximate the receive coil to detect information from the receive coil. In embodiments, the drive and receive coils are separated by an isolation material. In embodiments, a signal isolator IC packages includes transmit and receive coils and a magnetic field sensing element coupled to the receive coil.

Abstract: A system for suppressing low frequency noise of magnetoresistive sensors, includes a device for measuring a magnetic field, the device including at least one magnetoresistive sensor, the magnetoresistive sensor having a first sensitivity at a first operating point and a second sensitivity at a second operating point, the sensitivity at the second operating point being low or zero; a modulator configured to switch the at least one magnetoresistive sensor from the first operating point to the second operating point; and a signal processor for processing the signal derived from the device for measuring a magnetic field.

Abstract: A magnetic field sensor includes at least one coil responsive to an AC coil drive signal; at least two spaced apart magnetic field sensing elements responsive to a sensing element drive signal and positioned proximate to the at least one coil; and a circuit coupled to the at least two magnetic field sensing elements to generate an output signal of the magnetic field sensor indicative of a difference between a distance of a conductive target with respect to each of the at least two spaced apart magnetic field sensing elements.

Abstract: An NMR spectroscopy system for studying a region of a sample to be analysed, includes a magnetoresistive transducer made up of superposed planar layers, which receives a response signal of the sample; a system for making an AC current flow, at a supply frequency fc, through the transducer; a system for generating a magnetic field H0 that is constant and uniform throughout a zone of interest in which the sample and transducer are placed; and an exciting coil to generate a magnetic field H1 that is uniform throughout the zone of interest and that varies at a resonant frequency f1; the field H0 is substantially perpendicular to the layers of the transducer. The system further includes a regulating system to ensure that the field H0 and the planar layers remain orthogonal, and a system for detecting a signal of frequency fc?f1, f1?fc or fc+f1.

Abstract: A system for suppressing low frequency noise of magnetoresistive sensors, includes a device for measuring a magnetic field, the device including at least one magnetoresistive sensor, the magnetoresistive sensor having a first sensitivity at a first operating point and a second sensitivity at a second operating point, the sensitivity at the second operating point being low or zero; a modulator configured to switch the at least one magnetoresistive sensor from the first operating point to the second operating point; and a signal processor for processing the signal derived from the device for measuring a magnetic field.

Abstract: Methods and apparatus for providing data transfer with a drive coil to transmit information, a receive coil magnetically coupled to the drive coil, and a first magnetoresistive sensor proximate the receive coil to detect information from the receive coil. In embodiments, the drive and receive coils are separated by an isolation material. In embodiments, a signal isolator IC packages includes transmit and receive coils and a magnetic field sensing element coupled to the receive coil.

Abstract: A device for prosthetic vision rehabilitation, which includes a scleral explant with a shape that is suitable for being in contact with at least one portion of the sclera of an eye, and at least one inducer arranged on the scleral explant.

Abstract: A pressure sensor includes a chamber comprising a conductive portion and a deformable portion coupled to the conductive portion and susceptible to deformation in response to a pressure differential between an interior of the chamber and an exterior of the chamber; at least one coil responsive to an AC coil drive signal; at least one magnetic field sensing element disposed proximate to the at least one coil and to the conductive portion of the chamber and configured to generate a magnetic field signal in response to a reflected magnetic field generated by the at least one coil and reflected by the conductive portion; and a circuit coupled to the at least one magnetic field sensing element to generate an output signal of the pressure sensor indicative of the pressure differential between the interior of the chamber and the exterior of the chamber in response to the magnetic field signal.

Abstract: An NMR spectroscopy system for studying a region of a sample to be analysed, includes a magnetoresistive transducer made up of superposed planar layers, which receives a response signal of the sample; a system for making an AC current flow, at a supply frequency fc, through the transducer; a system for generating a magnetic field H0 that is constant and uniform throughout a zone of interest in which the sample and transducer are placed; and an exciting coil to generate a magnetic field H1 that is uniform throughout the zone of interest and that varies at a resonant frequency f1; the field H0 is substantially perpendicular to the layers of the transducer. The system further includes a regulating system to ensure that the field H0 and the planar layers remain orthogonal, and a system for detecting a signal of frequency fc?f1, f1?fc or fc+f1.

Abstract: A magnetic field sensor includes at least one coil responsive to an AC coil drive signal; at least one magnetic field sensing element responsive to a sensing element drive signal and configured to detect a directly coupled magnetic field generated by the at least one coil and to generate a magnetic field signal in response to the directly coupled magnetic field; a processor responsive to the magnetic field signal to compute a sensitivity value associated with detection of the directly coupled magnetic field and substantially independent of a reflected magnetic field reflected by a conductive target disposed proximate to the at least one magnetic field sensing element; and an output signal generator configured to generate an output signal of the magnetic field sensor indicative of the reflected magnetic field.

Abstract: A pressure sensor includes a chamber comprising a conductive portion and a deformable portion coupled to the conductive portion and susceptible to deformation in response to a pressure differential between an interior of the chamber and an exterior of the chamber; at least one coil responsive to an AC coil drive signal; at least one magnetic field sensing element disposed proximate to the at least one coil and to the conductive portion of the chamber and configured to generate a magnetic field signal in response to a reflected magnetic field generated by the at least one coil and reflected by the conductive portion; and a circuit coupled to the at least one magnetic field sensing element to generate an output signal of the pressure sensor indicative of the pressure differential between the interior of the chamber and the exterior of the chamber in response to the magnetic field signal.

Abstract: A magnetic field sensor includes at least one coil responsive to an AC coil drive signal; at least two spaced apart magnetic field sensing elements responsive to a sensing element drive signal and positioned proximate to the at least one coil; and a circuit coupled to the at least two magnetic field sensing elements to generate an output signal of the magnetic field sensor indicative of a difference between a distance of a conductive target with respect to each of the at least two spaced apart magnetic field sensing elements.