Abstract: A single-chip high-magnetic-field X-axis linear magnetoresistive sensor with a calibration and an initialization coil, comprising a high magnetic field single-chip referenced bridge X-axis magnetoresistive sensor, a calibration coil, and an initialization coil, wherein the calibration coils are planar coils, and the initialization coils are planar or three-dimensional coils. The planar calibration coils and the planar initialization coils can be placed above a substrate and below the magnetoresistive sensor units, between the magnetoresistive sensor units and the soft ferromagnetic flux guides, above the soft ferromagnetic flux guides, or at gaps between the soft ferromagnetic flux guides. The three-dimensional initialization coil is wound around the soft ferromagnetic flux guides and magnetoresistive sensor units.

Abstract: A low profile magnetoresistive imaging sensor array based on the principle of magnetic induction, which reduces a distance between a medium imaging sensor array and a medium by optimizing the arrangement of an application integrated circuit and a sensing element array and using an electric connection technology which can reduce the distance between the medium imaging sensor array and the medium, thereby increasing the resolution of the existing medium imaging sensor. The low profile magnetoresistive imaging sensor array includes a sensing element array and an application integrated circuit, and also includes a circuit which provides a power for the sensing element array, a magnetoresistive sensing element array selection circuit, a signal amplification circuit, a digitizer, a memory circuit, and a microprocessor. Additionally, the sensing element array includes at least one magnetoresistive sensing element.

Abstract: A push-pull X-axis magnetoresistive sensor, comprising: a substrate upon which an interlocked array of soft ferromagnetic flux concentrators and a push-pull magnetoresistive sensor bridge unit are placed. It further may comprise calibration coils and/or initialization coils. At least one of each of the soft ferromagnetic flux concentrators is present such that an interlocking structure may be formed such that there are alternately interlocked and non-interlocked gaps along the X direction. Push/pull magnetoresistive sensing unit strings are respectively located in the interlocked and non-interlocked gaps and are electrically connected to form a push-pull magnetoresistive bridge sensing unit. This magnetoresistive sensing unit is sensitive to magnetic field along the X direction.

Abstract: This invention discloses a TMR near-field magnetic communication system, which is used for detecting AC and DC magnetic fields generated by a near-field magnetic communication system, and inputting AC and DC magnetic field signal to an audio electroacoustic taking the same as input signals thereof. The audio electroacoustic device comprises a hearing aid, an earphone of a home entertainment system, a public hearing loop system with an embedded hearing device, etc. The TMR near-field magnetic communication system comprises one or more TMR sensor bridges for detecting AC and DC magnetic field signals, an analog-signal circuit containing a filter which is used for separating components of AC and DC signals output by a TMR sensor, an amplifier which is used for amplifying an AC electrical signal, and an analog output used for transmitting the AC electrical signal to the audio electroacoustic device.

Abstract: A precision syringe pump employing a syringe comprises a motor, a lead screw and a syringe driving head connected to the lead screw. The syringe comprises a cylinder and a plunger. The motor drives the lead screw to rotate clockwise or counterclockwise to drive the syringe driving head and push the plunger to move within the cylinder. The syringe pump further comprises: a magnetoresistive sensor, at least one permanent magnet and an MCU, the at least one permanent magnet being located on the lead screw and rotating therewith; the magnetoresistive sensor can sense the magnetic field generated by the at least one permanent magnet; the input end of the MCU is connected to the magnetoresistive sensor, and the output end of the MCU is connected to the motor; the MCU receives signals from the magnetoresistive sensor and controls, according to the signal feedback, the direction and velocity of the lead screw rotated by the motor.

Abstract: An electronic water meter capable of implementing precision metering. The electronic water meter comprises a machine frame, multiple counter units, and multiple shielding plates. The counter units comprise numerical character wheels, magnets, magnetic angular displacement sensors, and digital circuits. The magnetic angular displacement sensors are electrically connected to the digital circuits, sense components of magnetic fields at respective positions thereof on the basis of angular position changes of magnetic field vectors of the counter units, and transmit a corresponding electric signal to the digital circuits. The digital circuits perform a calculation processing on the basis of the electrical signal outputted by the magnetic angular displacement sensors and output a digital signal corresponding to the angular positions of the numerical character wheels.

Abstract: A mini lead screw pump monitors the rotation of a lead screw by using a magnetoresistive sensor and an MCU, and uses feedback to control the rotation direction and speed of the lead screw through a motor controller so as to control the speed of infusion to a patient. Furthermore, this mini lead screw pump can control the infusion speed of insulin according to the patient's blood sugar concentration monitored by CGM. This mini lead screw pump has several advantages, comprising high sensitivity, high reliability, low power consumption, low cost, and ease of use.

Abstract: A single chip Z-axis linear magnetoresistive sensor with a calibration/initialization coil comprises a single chip Z-axis linear magnetoresistive sensor, and a calibration coil and/or an initialization coil. The calibration coil and the initialization coil are planar coils or three-dimensional coils. The planar coils are located above a substrate and below a magnetoresistive sensing unit, between a magnetoresistive sensing unit and a soft ferromagnetic flux concentrator, above a soft ferromagnetic flux concentrator, or in a gap of the soft ferromagnetic flux concentrator. The three-dimensional coil is wound around the soft ferromagnetic flux concentrator and the magnetoresistive sensing unit.

Abstract: Provided is a magnetic absolute rotary encoder, comprising a rotation shaft, multiple rotating wheels that can rotate along the rotation shaft, multiple encoding units that correspond to the multiple rotating wheels one-to-one, and one or more permanent magnet assemblies that provide the magnetic bias to the multiple encoding units. Each encoding unit comprises a magnetically permeable encoder disc, the structure thereof enabling the magnetic permeability thereof to be different according to the different positions of the rotation shaft, and comprises multiple sensor units that comprise multiple magnetic sensors. The sensor units are used to sense the magnetic permeability of the magnetically permeable encoder disc and to output the sensor signals that characterize the relative position of the magnetically permeable encoder disc.

Abstract: A magnetoresistive audio pickup comprises an audio detection circuit. The audio detection circuit comprises at least one linear magnetoresistive sensor, a coupling capacitance, an AC amplifier, and a signal processing circuit comprising an additional amplifier. The linear magnetoresistive sensor comprises at least one single-axis linear magnetoresistive sensor unit. The linear magnetoresistive sensors are placed in a measurement plane above a speaker's voice coil, the signal output end of each single-axis linear magnetoresistive sensor unit is capacitively coupled to the AC amplifier which provides AC signals through electrical connection to the amplifier, these signals are combined within the signal processing unit into an audio signal, and the audio signal is output from the circuit; each single-axis linear sensor unit is located in the linear response area of the measurement plane.

Abstract: Disclosed is a low fly height in-plane magnetic image sensor chip. This sensor chip comprises a silicon (Si) substrate with a pit on the surface, a magnetoresistive sensor, and an insulating layer. The magnetoresistive sensor is located on the bottom surface of the pit in the Si substrate. The insulating layer is located above the magnetoresistive sensor. The magnetic image surface detected during operation is coplanar or parallel with the surface of the Si substrate surface. The input and output ends of the magnetoresistive sensor are connected with leads directly, or bonded with leads through pads, or through a conducting post and pads to form connections. And the flying height of the leads is lower than the height of the surface of the Si substrate. This technical solution has several advantages, such as compact structure, high output signal, and direct contact with the magnetic image.

Abstract: A single-chip Z-axis linear magnetoresistive sensor is provided. The sensor comprises a substrate, magnetoresistive sensing elements, and flux guides, wherein the magnetoresistive sensing elements are mutually electrically connected to form push arms and pull arms of a bridge; the push arms and the pull arms are alternately arranged, and the magnetoresistive sensing elements on the push arms and the pull arms are respectively located at two sides beneath the flux guides; the magnetization direction of a pinning layer of each magnetoresistive sensing element is the same and is in an X-axis direction. An external magnetic field in a Z-axis direction is converted into a magnetic field with components in an X-axis direction by the flux guides, and thus the magnetoresistive sensing elements beneath the flux guides can detect this component.

Abstract: A monolithic three-axis magnetic field sensor comprises an X-axis sensor, a Y-axis sensor and a Z-axis sensor integrated into the same substrate. The X-axis sensor and the Y-axis are both referenced bridge structures. The magnetoresistive sensing elements of the reference arm are beneath the corresponding magnetic flux guides, and the magnetoresistive sensing elements are in the gaps between the corresponding magnetic flux guides. The magnetoresistive elements of these two sensors are aligned perpendicular to each other, and the magnetization directions of the pinned layer of these magnetoresistive elements are perpendicular to each other as well. The Z-axis sensor is a push-pull bridge structure. The push arms and pull arms of the magnetoresistive sensors are respectively aligned above or beneath the edges of the magnetic flux guides. The manufacturing method for this monolithic three-axis magnetic field sensor is also disclosed.

Abstract: Provided are a single-chip differential free layer push-pull magnetic field sensor bridge and preparation method, the magnetic field sensor bridge comprising: a substrate, a staggered soft magnetic flux concentrator array, and a GMR spin valve or a TMR magnetoresistance sensing unit array having a magnetic sensing axis in an X-direction on the substrate. A soft magnetic flux concentrator comprises sides parallel to an X-axis and a Y-axis, and four corners sequentially labeled as A, B, C and D clockwise from an upper left position. Magnetoresistive sensing units are located at gaps between the soft magnetic flux concentrators. Additionally, the magnetoresistive sensing units corresponding to the A and C corner positions and B and D corner positions of the soft flux concentrators are defined as push magnetoresistive sensing units and pull magnetoresistive sensing units, respectively.

Abstract: The present invention discloses a magnetoresistive gear tooth sensor, which includes a magnetoresistive sensor chip and a permanent magnet. The magnetic sensor chip is comprised of at least one magnetoresistive sensor bridge, and each arm of the sensor bridge has at least one MTJ element group. The magnetoresistive gear tooth sensor has good temperature stability, high sensitivity, low power consumption, good linearity, wide linear range, and a simple structure. Additionally, the magnetoresistive gear tooth sensor has a concave soft ferromagnetic flux concentrator, which can be used to reduce the component of the magnetic field generated by the permanent magnet along the sensing direction of the MTJ sensor elements, enabling a wide linear range. Because it is arranged as a gradiometer, the magnetoresistive gear tooth sensor bridge is not affected by stray magnetic field; it is only affected by the gradient magnetic field generated by gear teeth in response to the permanent magnet bias.

Abstract: A single chip referenced bridge type magnetic field sensor for high-intensity magnetic field, the sensor comprises a substrate, a reference arm, a sense arm, shielding structures and attenuators. Wherein the reference arms and the sense arms comprise at least two rows/columns of reference element strings and sense element strings which comprise one or more identical electrically interconnected magnetoresistive sense elements; the reference element strings and the sense element strings are mutually interleaved, each reference element string is designed with a shielding structure on top of it, and each sense element string is designed with an attenuator on top of it. The magnetoresistive sensor elements can be AMR, GMR or TMR sensor elements. The shielding structures and attenuators are arrays of long rectangular bars composed of a soft ferromagnetic material, such as permalloy.

Abstract: A rapid thermal processing method and apparatus used for programming the pinned layer of spintronic devices, the apparatus comprising a rapid thermal annealing light source, a reflective cover, a magnet, a wafer, and a substrate. The light source is used for heating the substrate. The reflective cover at least comprises a transparent insulating layer and a reflective layer. The magnet is used to produce a constant magnetic field. An antiferromagnetic layer on a wafer may be locally programmed by controlling the exposure time, for heating a specific area on the wafer to a temperature above the blocking temperature of the antiferromagnetic layer, and then turning off the magnetic field after the heating area has cooled in the presence of the applied magnetic field. This rapid thermal processing method is used to improve the spatial resolution of laser annealing. It provides excellent performance, and it is suitable for mass production.

Abstract: This invention discloses a type of noncontact linear potentiometer; the potentiometer comprises a slider, a rotating shaft, a guide rod, a tunneling magnetoresistive sensor, a permanent magnet, a printed circuit board, and two support structures. In this configuration the slider moves along the guide rod and the rotating shaft, causing the rotation of the rotating shaft; the permanent magnet is attached to an end of the rotating shaft, and it therefore rotates as the shaft rotates. A tunneling magnetoresistive sensor is located adjacent to the permanent magnet, soldered onto a printed circuit board, and it is used to measure the angle of rotation of the permanent magnet. The guide rod constrains the sliding direction of the slider, and the two support structures are located at the opposite ends of the guide rod and rotating shaft, and they are used to support the rotating shaft and guide rod. Located between the slider and rotating shaft is a ball bearing, a pin and a leaf spring assembly.

Abstract: A liquid level sensor system is disclosed for remotely monitoring the liquid level in a tank. The system comprises a first fixed portion with a first liquid level response unit, and a second fixed portion with a second liquid level response unit. A guide tube is inserted into the tank and attached to the bottom of the first fixed portion. The guide tube is provided with a multitude of ports, such that the liquid level in the guide tube is flush with the liquid level in the tank. The first liquid level response unit comprises a float floating up and down with the variation of the liquid level in the guide tube, a rotating shaft rotating around a relatively fixed axis of rotation in the up and down floating process of the float, and a permanent magnet. The second fixed portion is attached to the top of the first fixed portion. The second liquid level response unit comprises a PCB, a magnetoresistive angle sensor chip, and a control circuit electrically connected to the magnetoresistive angle sensor chip.

Abstract: A direct-current fan control chip comprises a magnetoresistive sensor, a controller, a driver and a substrate. The magnetoresistive sensor, the controller and the driver are integrated on the substrate. The sensing direction of the magnetoresistive sensor is perpendicular to or parallel to the surface of the direct-current fan control chip. The magnetoresistive sensor provides the controller with a rotor position signal, a rotor speed signal, and rotor a rotation direction signal for the controller. The controller outputs a control signal to the driver according to the received signals. After receiving the control signals, the driver outputs a drive signal. This control chip has the advantages of good temperature stability, good frequency response and so on.