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公开(公告)号：US20220342007A1
公开(公告)日：2022-10-27
申请号：US17810461
申请日：2022-07-01
Applicant: Allegro MicroSystems, LLC , Commissariat à l'énergie atomique et aux énergies alternatives
Inventor： Alexander Latham , Claude Fermon , Jason Boudreau , Myriam Pannetier-Lecoeur , Bryan Cadugan , Hernán D. Romero
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.
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公开(公告)号：US11115084B2
公开(公告)日：2021-09-07
申请号：US16200799
申请日：2018-11-27
Applicant: Allegro MicroSystems, LLC , Commissariat à l'énergie atomique et aux énergies alternatives
Inventor： Alexander Latham , Claude Fermon , Myriam Pannetier-Lecoeur
IPC: H04B5/00
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.
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公开(公告)号：US10935612B2
公开(公告)日：2021-03-02
申请号：US15999448
申请日：2018-08-20
Applicant: Allegro MicroSystems, LLC , Commissariat à l'énergie atomique et aux énergies alternatives
Inventor： Noémie Belin , Shaun D. Milano , Wade Bussing , Claude Fermon
IPC: G01R15/20 , G01R19/00 , G01R33/025 , G01R33/09
Abstract: Systems and methods described herein provide a current sensor based on magnetic field detection having multiple sensor arrangements with multiple, different sensitivity ranges. The outputs of the multiple sensor arrangements can be combined to generate a single output signal. The current sensor can include two or more sensor arrangements, each having one or more magnetic field sensing elements, and configured to sense a magnetic field in different first measurement ranges corresponding to different ranges of currents through the conductor and further configured to generate different magnetic field signals indicative of the sensed magnetic field in the respective measurement range. The current sensor can include a circuit configured to generate an output signal indicative of a combination of the different magnetic field signals that corresponds to the current through the conductor.
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公开(公告)号：US10347277B2
公开(公告)日：2019-07-09
申请号：US15886032
申请日：2018-02-01
Applicant: Allegro MicroSystems, LLC
Inventor： Paolo Campiglio , Bryan Cadugan , Claude Fermon , Rémy Lassalle-Balier
IPC: G11B5/39 , G01R33/09 , H01F10/32 , H01L43/08 , G01R33/00 , H01L43/02 , H01L43/10 , H01L43/12 , H01F41/30
Abstract: A magnetoresistance element has a pinning arrangement with two antiferromagnetic pinning layers, two pinned layers, and a free layer. A spacer layer between one of the two antiferromagnetic pinning layers and the free layer has a material selected to allow a controllable partial pinning by the one of the two antiferromagnetic pinning layers.
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公开(公告)号：US10310028B2
公开(公告)日：2019-06-04
申请号：US15606362
申请日：2017-05-26
Applicant: Allegro MicroSystems, LLC , COMMISSARIAT À L'ÉNERGIE ATOMIQUE ET AUX ÉNERGIES ALTERNATIVES
Inventor： Alexander Latham , Michael C. Doogue , Claude Fermon , Xavier Du Hamel De Milly , Myriam Pannetier-Lecoeur
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.
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Patent Agency Ranking
公开(公告)号：US20230375644A1
公开(公告)日：2023-11-23
申请号：US18366148
申请日：2023-08-07
Applicant: Allegro MicroSystems, LLC , Commissariat à l'énergie atomique et aux énergies alternatives
Inventor： Alexander Latham , Claude Fermon , Jason Boudreau , Myriam Pannetier-Lecoeur , Bryan Cadugan , Hernán D. Romero
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.
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公开(公告)号：US11320496B2
公开(公告)日：2022-05-03
申请号：US16827951
申请日：2020-03-24
Applicant: Allegro MicroSystems, LLC , COMMISSARIAT À L'ÉNERGIE ATOMIQUE ET AUX ÉNERGIES ALTERNATIVES
Inventor： Alexander Latham , Claude Fermon , Gerardo A. Monreal , Alejandro Gabriel Milesi
IPC: G01R33/00 , G01R33/025 , G01R33/028 , G01R33/06 , G01R33/07 , G01D5/14 , G01D5/20 , G01B7/30 , H01F5/04
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.
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公开(公告)号：US20180340990A1
公开(公告)日：2018-11-29
申请号：US15606362
申请日：2017-05-26
Applicant: Allegro MicroSystems, LLC , COMMISSARIAT À L'ÉNERGIE ATOMIQUE ET AUX ÉNERGIES ALTERNATIVES
Inventor： Alexander Latham , Michael C. Doogue , Claude Fermon , Xavier Du Hamel De Milly , Myriam Pannetier-Lecoeur
CPC classification number: G01R33/072 , G01L9/007 , G01L13/025 , G01R33/0005 , G01R33/0017 , G01R33/0035 , G01R33/091 , G01R33/096 , G01R33/098 , G01R33/305
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.
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公开(公告)号：US09804234B2
公开(公告)日：2017-10-31
申请号：US14591213
申请日：2015-01-07
Applicant: Allegro MicroSystems, LLC
Inventor： Cyril Dressler , Claude Fermon , Myriam Pannetier-Lecoeur , Marie-Claire Cyrille , Paolo Campiglio
IPC: G11B5/39 , G01R33/09 , G01R33/00 , H01L43/02 , H01L43/08 , H01L43/10 , H01L43/12 , H01F10/32 , H01F41/30
CPC classification number: G11B5/3932 , G01R33/0052 , G01R33/09 , G01R33/093 , G01R33/098 , G11B5/39 , G11B5/3903 , G11B5/3906 , G11B5/3909 , G11B5/3929 , G11B2005/3996 , H01F10/3263 , H01F10/3272 , H01F41/306 , H01L43/02 , H01L43/08 , H01L43/10 , H01L43/12 , Y10T29/41
Abstract: A magnetoresistance element can have a substrate; a ferromagnetic seed layer consisting of a binary alloy of NiFe; and a first nonmagnetic spacer layer disposed under and directly adjacent to the ferromagnetic seed layer and proximate to the substrate, wherein the first nonmagnetic spacer layer is comprised of Ta or Ru. A method fabricating of fabricating a magnetoresistance element can include depositing a seed layer structure over a semiconductor substrate, wherein the depositing the seed layer structure includes depositing at least a ferromagnetic seed layer over the substrate. The method further can further include depositing a free layer structure over the seed layer structure, wherein the depositing the ferromagnetic seed layer comprises depositing the ferromagnetic seed layer in the presence of a motion along a predetermined direction and in the presence of a predetermined magnetic field having the same predetermined direction.
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公开(公告)号：US20170089987A1
公开(公告)日：2017-03-30
申请号：US14870834
申请日：2015-09-30
Applicant: Allegro MicroSystems, LLC
Inventor： Gerardo A. Monreal , Andreas P. Friedrich , Claude Fermon , Myriam Pannetier-Lecoeur
CPC classification number: G01R33/0023 , G01R33/09 , G01R33/093
Abstract: A magnetic field sensor and an associated method use one or more magnetoresistance elements driven with an AC mixing current and experiencing an AC mixing magnetic field to generate a DC voltage signal or a DC voltage signal component related to a slope of a transfer curve of the one or more magnetoresistance elements.
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