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公开(公告)号：US20200096576A1
公开(公告)日：2020-03-26
申请号：US16139558
申请日：2018-09-24
Applicant: Allegro MicroSystems, LLC
Inventor： Conrado Rossi , Hernán D. Romero , Maria C. Costa
Abstract: A driver circuit includes a power terminal, a reference terminal, and a bridge circuit. The bridge circuit comprises a first switch coupled to the power terminal, a second switch coupled in series between the first switch and the reference terminal to form a first output terminal between the first and second switches, a third switch coupled to the power terminal, and a fourth switch coupled in series between the third switch and the reference terminal to form a second output terminal between the third and fourth switches. The second and fourth switches are PNP BJT devices.
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公开(公告)号：US20170356966A1
公开(公告)日：2017-12-14
申请号：US15180199
申请日：2016-06-13
Applicant: Allegro MicroSystems, LLC
Inventor： Hernán D. Romero
IPC: G01R33/00
CPC classification number: G01R33/0017 , G01P21/02 , G01R33/0029 , G01R33/06 , G01R35/005
Abstract: A method of calibrating a magnetic field sensor includes setting a first input signal at a first input node of a processor of the magnetic field sensor to a constant value. While the magnetic field sensor experiences a magnetic field, a first transition at an output node of the processor is measured. A second input signal at a second input node of the processor is set to the constant value. While the magnetic field sensor experiences the magnetic field, a second transition of at the output node of the processor is measured. An orthogonality error value is calculated based on a deviation of the first transition and the second transition. The first and/or second input signal is adjusted by modifying the first and/or second input signal by a function of the calculated orthogonality error value to compensate for the orthogonality error.
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公开(公告)号：US09739848B1
公开(公告)日：2017-08-22
申请号：US15012131
申请日：2016-02-01
Applicant: Allegro Microsystems, LLC
Inventor： Octavio H. Alpago , Ezequiel Alves , Hernán D. Romero
CPC classification number: G01R33/077 , G01D5/145 , G01D5/2448 , H02K29/08
Abstract: A magnetic field sensor comprises a circular vertical Hall (CVH) sensing element comprising a plurality of vertical Hall elements, each vertical Hall element comprised of a respective group of vertical Hall element contacts selected from among a plurality of vertical Hall element contacts. A quadrature modulator circuit is coupled to the digital signal and operable to generate a plurality of quadrature modulated signals. A processor stage is coupled to receive the signals representative of the plurality of quadrature modulated signals, and operable to perform a sliding window integration using the signals representative of the plurality of quadrature modulated signals and compute an estimated angle of the external magnetic field using the signals representative of the plurality of quadrature modulated signals.
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公开(公告)号：US20170219663A1
公开(公告)日：2017-08-03
申请号：US15012125
申请日：2016-02-01
Applicant: Allegro Microsystems, LLC
Inventor： Octavio H. Alpago , Ezequiel Alves , Hernán D. Romero
CPC classification number: G01R33/077 , G01D5/145 , G01D5/2448 , G01R33/0029 , H02K29/08
Abstract: A magnetic field sensor comprises a circular vertical Hall (CVH) sensing element having a plurality of vertical Hall elements. A CVH output stage is included comprising one or more of drive circuits to drive the plurality of vertical Hall elements and produce an analog signal representing a strength of an external magnetic field as detected by the plurality of vertical Hall elements. An analog-to-digital converter is coupled to receive the analog signal and produce a digital signal. A quadrature modulator circuit is coupled to the digital signal and operable to generate a plurality of quadrature modulated signals. A processor stage receives signals representative of the plurality of quadrature modulated signals and computes an estimated angle of the external magnetic field.
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公开(公告)号：US20250076414A1
公开(公告)日：2025-03-06
申请号：US18458509
申请日：2023-08-30
Applicant: Allegro MicroSystems, LLC
Inventor： Hernán D. Romero
Abstract: A system, comprising: a reference magnetic field source that is configured to generate a reference magnetic field; a plurality of magnetic field sensing elements arranged in a sensing bridge, the sensing bridge being configured to sense the reference magnetic field and an external magnetic field simultaneously, the sensing bridge being configured to output a first signal and a second signal; a first circuit that is configured to generate a common mode signal of the sensing bridge based on the first signal and the second signal; an adjustment circuit that is configured to adjust a sensitivity of the sensing bridge based, at least in part, on a common mode signal of the sensing bridge; and a processing circuitry that is configured to use a differential signal of the sensing bridge to generate an output signal, the differential signal being based on a strength of the external magnetic field.
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Patent Agency Ranking
公开(公告)号：US12181538B2
公开(公告)日：2024-12-31
申请号：US18070918
申请日：2022-11-29
Applicant: Allegro MicroSystems, LLC
Inventor： Hernán D. Romero
IPC: G01R33/09
Abstract: Magnetic field sensors having at least two bridges including MR elements are described. MR elements of each bridge have different magnetic reference directions. A first bridge is positioned to sense a first uniform magnetic field of a first polarity and a second bridge is positioned to sense a second uniform magnetic field of a second polarity opposite to the first polarity. The first and second uniform magnetic fields make up a differential field of interest. The described magnetic field sensors sense the field of interest in a manner that is immune to stray fields. Dual signal path embodiments are described in which outputs of the two bridges are independently processed and single signal path embodiments include a single signal path for processing the output of a combined (e.g., parallel) bridge arrangement.
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公开(公告)号：US12174275B2
公开(公告)日：2024-12-24
申请号：US18176745
申请日：2023-03-01
Applicant: Allegro MicroSystems, LLC
Inventor： Hernán D. Romero
Abstract: Magnetic field closed loop sensors including offset reduction circuitry to reduce undesired baseband components attributable to offset associated with magnetoresistance elements are described. A superimposed signal including a main signal portion indicative of a parameter of a target and an offset reduced signal portion is coupled to feedback circuitry. The feedback circuitry generates a feedback signal to drive a feedback coil. Main processing circuitry is operative to extract the main signal portion from the superimposed signal and produce a sensor output signal based on the main signal portion. Example offset reduction circuitry can take the form of AC coupling circuitry or a ripple reduction loop.
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28.发明授权公开(公告)号：US11953565B2
公开(公告)日：2024-04-09
申请号：US17663062
申请日：2022-05-12
Applicant: Allegro MicroSystems, LLC
Inventor： Hernán D. Romero
CPC classification number: G01R33/09 , G01R33/0023 , H01F10/3268
Abstract: In one aspect, bridge circuitry includes a first magnetoresistance (MR) element connected with a second MR element at a first node; a third MR element connected with the first MR element at a second node; a fourth MR element connected with the third MR element at a third node; a fifth MR element connected with a sixth MR element at a fourth node; a seventh MR element connected with the fifth MR element at a fifth node; and an eighth MR element connected with the seventh MR element at a sixth node; and a plurality of eight switches. Six of the plurality of eight switches are each connected to a corresponding one node.
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公开(公告)号：US20230204693A1
公开(公告)日：2023-06-29
申请号：US18176745
申请日：2023-03-01
Applicant: Allegro MicroSystems, LLC
Inventor： Hernán D. Romero
CPC classification number: G01R33/091 , G01R33/098 , G01R33/0041
Abstract: Magnetic field closed loop sensors including offset reduction circuitry to reduce undesired baseband components attributable to offset associated with magnetoresistance elements are described. A superimposed signal including a main signal portion indicative of a parameter of a target and an offset reduced signal portion is coupled to feedback circuitry. The feedback circuitry generates a feedback signal to drive a feedback coil. Main processing circuitry is operative to extract the main signal portion from the superimposed signal and produce a sensor output signal based on the main signal portion. Example offset reduction circuitry can take the form of AC coupling circuitry or a ripple reduction loop.
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公开(公告)号：US20230152393A1
公开(公告)日：2023-05-18
申请号：US17525224
申请日：2021-11-12
Applicant: Allegro MicroSystems, LLC
Inventor： David J. Haas , Hernán D. Romero
CPC classification number: G01R33/0023 , G01D9/00
Abstract: A method is provided for use in a sensor, the method comprising: selecting a switching cycle for the sensor; transitioning the sensor into a state in which at least one component of the sensor is periodically turned on and off in accordance with the switching cycle; sampling an analog signal to generate a sampled signal, the analog signal being generated by at least one sensing element, the analog signal being sampled only during periods in which the at least one component of the sensor is turned on; and generating an output signal based, at least in part, on the sampled signal and outputting the output signal.
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