Abstract: An apparatus comprises a first substrate and two coils supported by the first substrate and arranged next to each other, the coils configured to each generate a magnetic field which produces eddy currents in and a reflected magnetic field from a conductive target, the two coils arranged so their respectively generated magnetic fields substantially cancel each other in an area between the coils. One or more magnetic field sensing elements are positioned in the area between the coils and configured to detect the reflected magnetic field.

Abstract: A current sensor integrated circuit (IC) includes a unitary lead frame having at least one first lead having a terminal end, at least one second lead having a terminal end, and a paddle having a first surface and a second opposing surface. A semiconductor die is supported by the first surface of the paddle, wherein the at least one first lead is electrically coupled to the semiconductor die and the at least one second lead is electrically isolated from the semiconductor die. The current sensor IC further includes a first mold material configured to enclose the semiconductor die and the paddle and a second mold material configured to enclose at least a portion of the first mold material, wherein the terminal end of the at least one first lead and the terminal end of the at least one second lead are external to the second mold material.

Abstract: A magnetic field sensor includes a substrate, a first channel comprising a first magnetic field sensing element supported by the substrate and configured to generate a first magnetic field signal indicative of a first magnetic field experienced by the first magnetic field sensing element, a second channel comprising a second magnetic field sensing element supported by the substrate and configured to generate a second magnetic field signal indicative of a second magnetic field experienced by the second magnetic field sensing element, and at least one shield configured to reduce a bandwidth of the first magnetic field by a first amount and to reduce a bandwidth of the second magnetic field by a second amount. The shield is able to act as a magnetic anti-aliasing filter for the magnetic field sensing elements, which can then be chopped or sampled.

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: A current sensor can include a lead frame. The lead frame can include a first lead and a second lead, wherein the first and second leads are coupled together at a first junction region of the lead frame, wherein the current sensor is operable to sense a magnetic field generated by a first current passing through the first junction region. The current sensor can further include a first die disposed proximate to the lead frame. The first die can include a first magnetic field sensing element disposed on a surface of the first die, a first circuit coupled to the first magnetic field sensing element for generating a first signal indicative of a first current, and a first node coupled to the first signal. The current sensor can further include a second die disposed proximate to the lead frame.

Abstract: Methods and apparatus for a sensor having non-ratiometric fault trip level setting. In embodiments, a sensor has a sensing element with a fixed gain. A signal processing module receives the fault trip level setting and maintains the fault trip level setting constant during changes in the supply voltage.

Abstract: A current sensor can include a lead frame. The lead frame can include a first lead and a second lead, wherein the first and second leads are coupled together at a first junction region of the lead frame, wherein the current sensor is operable to sense a magnetic field generated by a first current passing through the first junction region. The current sensor can further include a first die disposed proximate to the lead frame. The first die can include a first magnetic field sensing element disposed on a surface of the first die, a first circuit coupled to the first magnetic field sensing element for generating a first signal indicative of a first current, and a first node coupled to the first signal. The current sensor can further include a second die disposed proximate to the lead frame.

Abstract: Systems and methods described herein are directed towards differential current sensing a current sensor having two or more magnetic field sensing elements that are oriented to sense a magnetic field generated by a current through an external conductor in the same direction. The current sensor can be positioned such that at least one first magnetic field sensing element is vertically aligned with the external conductor and at least one second magnetic field sensing element is not vertically aligned with the external conductor. The magnetic field sensing elements may be spaced from each to measure a gradient field and can generate a magnetic field signal indicative of a distance between the respective magnetic field sensing element and the current carrying external conductor. A difference between the magnetic field signals can be determined that is indicative of the current through the external conductor.

Abstract: A magnetic field sensor for sensing external magnetic fields on multiple axes comprises a coil structure and a gain equalization circuit. The coil structure generates reference fields on magnetic field sensing elements in each axis. The gain equalization circuit measures and compares reference fields to generate gain-equalized output signals responsive to the external magnetic fields.

Abstract: A magnetic field sensor includes a substrate, a first channel comprising a first magnetic field sensing element supported by the substrate and configured to generate a first magnetic field signal indicative of a first magnetic field experienced by the first magnetic field sensing element, a second channel comprising a second magnetic field sensing element supported by the substrate and configured to generate a second magnetic field signal indicative of a second magnetic field experienced by the second magnetic field sensing element, and at least one shield configured to reduce a bandwidth of the first magnetic field by a first amount and to reduce a bandwidth of the second magnetic field by a second amount. The shield is able to act as a magnetic anti-aliasing filter for the magnetic field sensing elements, which can then be chopped or sampled.

Abstract: A network-accessible service such as a web site may authenticate users through a login process. In order to detect possibly fraudulent login events, the service may implement a framework based on recorded login events. For example, attributes of multiple recorded login events may be analyzed to create a framework that can be applied to attributes of newly received login requests to predict whether the newly received login requests are fraudulent. The framework may comprise criteria, algorithms, rules, models, and/or techniques, and may be constructed using various means such as pattern recognition, machine learning, and/or cluster analysis.

Abstract: An apparatus comprises a first substrate and two coils supported by the first substrate and arranged next to each other, the coils configured to each generate a magnetic field which produces eddy currents in and a reflected magnetic field from a conductive target, the two coils arranged so their respectively generated magnetic fields substantially cancel each other in an area between the coils. One or more magnetic field sensing elements are positioned in the area between the coils and configured to detect the reflected magnetic field.

Abstract: A current sensor integrated circuit including a magnetic field sensing element, a current conductor, an insulation structure, and a power calculation circuit is configured to meet safety isolation requirements. Isolation resistors allow for voltage from a high voltage side to be sensed at a low voltage side of the circuit. The insulation structure, current sensor package, and isolation resistors can achieve at least 500 Vrms isolation.

Abstract: Apparatus includes a first portion of conductive material having varying response to a generated magnetic field along a length of the conductive material, wherein the first portion of conductive material produces a varying eddy current and a varying reflected magnetic field, in response to the generated magnetic field. The apparatus further includes one or more reference portions of conductive material having a relatively invariable response to the generated magnetic field, wherein the reference portion of conductive material produces a relatively invariable eddy current and a relatively invariable reflected magnetic field in response to the generated 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: An apparatus comprises a first substrate and two coils supported by the first substrate and arranged next to each other, the coils configured to each generate a magnetic field which produces eddy currents in and a reflected magnetic field from a conductive target, the two coils arranged so their respectively generated magnetic fields substantially cancel each other in an area between the coils. One or more magnetic field sensing elements are positioned in the area between the coils and configured to detect the reflected magnetic field.

Abstract: Methods and apparatus for bi-directional communication between first and second die of a signal isolator for feedback and/or diagnostic signals. In embodiments, the first and second die can be matched.

Abstract: An apparatus comprises a conductive material having varying thickness along its length, the varying thickness providing varying response along a length of the conductive material to a magnetic field having a non-zero frequency; wherein the magnetic field produces an eddy current in the conductive material which generates a reflected magnetic field, wherein the varying response causes the reflected magnetic field to vary in strength along the length of the conductive material. The apparatus may include one or more reference portions of conductive material.

Abstract: A network-accessible service such as a web site may authenticate users through a login process. In order to detect possibly fraudulent login events, the service may implement a framework based on recorded login events. For example, attributes of multiple recorded login events may be analyzed to create a framework that can be applied to attributes of newly received login requests to predict whether the newly received login requests are fraudulent. The framework may comprise criteria, algorithms, rules, models, and/or techniques, and may be constructed using various means such as pattern recognition, machine learning, and/or cluster analysis.

Abstract: A magnetic field sensor can include a substrate, a first magnetoresistance element disposed over the substrate and including a first maximum response axis and a first bias layer structure configured to generate a first bias magnetic field with a first magnetic direction between ninety degrees and sixty degrees relative to the first maximum response axis. The magnetic field sensor can also include a second magnetoresistance element disposed over the substrate and including a second maximum response axis parallel to the first maximum response axis and a second bias layer structure configured to generate a second bias magnetic field with a second magnetic direction parallel to the first magnetic direction and opposed to the first magnetic direction. The first and second magnetoresistance elements can each have a pair of electrical contacts for coupling to circuits.