Patents by Inventor Michael C. Doogue

Michael C. Doogue has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20200241084
    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.
    Type: Application
    Filed: April 17, 2020
    Publication date: July 30, 2020
    Applicant: Allegro MicroSystems, LLC
    Inventors: Alexander Latham, Michael C. Doogue, Jason Boudreau
  • Patent number: 10725100
    Abstract: Methods and apparatus for magnetic field sensor having a sensing element, an analog circuit path coupled to the sensing element for generating an output voltage in response to a magnetic field applied to the sensing element, and a coil in proximity to the sensing element, the coil having a first terminal that is accessible external to the magnetic field sensor.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: July 28, 2020
    Assignee: Allegro MicroSystems, LLC
    Inventors: Shaun D. Milano, Michael C. Doogue, William P. Taylor
  • Patent number: 10649042
    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.
    Type: Grant
    Filed: April 25, 2019
    Date of Patent: May 12, 2020
    Assignee: Allegro MicroSystems, LLC
    Inventors: Alexander Latham, Michael C. Doogue, Jason Boudreau
  • Patent number: 10622549
    Abstract: Methods and apparatus for a signal isolator having a dielectric interposer supporting first and second die each having a magnetic field sensing element. A first signal path extends from the first die to the second die and a second signal path extends from the second die to the first die. In embodiments, the first signal path is located in the interposer and includes a first coil to generate a magnetic field and the second signal path is located in the interposer and includes a second coil to generate a magnetic filed. The first coil is located in relation to the second magnetic field sensing element of the second die and the second coil is located in relation to the first magnetic field sensing element of the first die.
    Type: Grant
    Filed: August 29, 2017
    Date of Patent: April 14, 2020
    Assignee: Allegro MicroSystems, LLC
    Inventors: Sundar Chetlur, Harianto Wong, Maxim Klebanov, William P. Taylor, Michael C. Doogue
  • Patent number: 10571301
    Abstract: In one aspect, an integrated circuit (IC) includes a magnetic field sensor to detect speed and direction of angular rotation of a rotating magnetic structure. The magnetic field sensor includes at least two magnetic field sensing elements configured to sense changes in a magnetic field caused by rotation of the magnetic structure. The IC also includes an output port configured to provide an output signal of the magnetic field sensor. The frequency of the output signal indicates the speed and the direction or indicates a fault.
    Type: Grant
    Filed: July 20, 2017
    Date of Patent: February 25, 2020
    Assignee: Allegro MicroSystems, LLC
    Inventors: Michael C. Doogue, P. Karl Scheller
  • Publication number: 20200049760
    Abstract: Methods and apparatus for providing an integrated circuit having a drive current source, a magnetic sensing element coupled to the drive current source, the magnetic sensing element having first and second differential outputs, and first and second current elements to provide respective currents in relation to the drive current source, wherein the first current element is coupled to the first differential output and the second current element is coupled to the second differential output. In illustrative embodiments, an IC output can output a voltage corresponding to the currents of the first and second current elements.
    Type: Application
    Filed: October 17, 2019
    Publication date: February 13, 2020
    Applicant: Allegro MicroSystems, LLC
    Inventors: Shaun D. Milano, Georges El Bacha, Michael C. Doogue, David J. Haas, Gregory Delmain, Michael Gaboury, William P. Taylor
  • Patent number: 10488458
    Abstract: Methods and apparatus for providing an integrated circuit having a drive current source, a magnetic sensing element coupled to the drive current source, the magnetic sensing element having first and second differential outputs, and first and second current elements to provide respective currents in relation to the drive current source, wherein the first current element is coupled to the first differential output and the second current element is coupled to the second differential output. In illustrative embodiments, an IC output can output a voltage corresponding to the currents of the first and second current elements.
    Type: Grant
    Filed: December 22, 2014
    Date of Patent: November 26, 2019
    Assignee: Allegro MicroSystems, LLC
    Inventors: Shaun D. Milano, Georges El Bacha, Michael C. Doogue, David J. Haas, Gregory Delmain, Michael Gaboury, William P. Taylor
  • Patent number: 10473486
    Abstract: In one aspect, an integrated circuit (IC) includes a magnetic field sensor to detect speed and direction of angular rotation of a rotating magnetic structure. The magnetic field sensor includes at least two magnetic field sensing elements configured to sense changes in a magnetic field caused by rotation of the magnetic structure. The IC also includes an output port configured to provide an output signal of the magnetic field sensor. A duty cycle percentage of the output signal indicates the speed and the direction or indicates a fault.
    Type: Grant
    Filed: July 20, 2017
    Date of Patent: November 12, 2019
    Assignee: Allegro MicroSystems, LLC
    Inventors: Michael C. Doogue, P. Karl Scheller
  • Publication number: 20190285667
    Abstract: Systems and methods described herein are directed towards integrating a shield layer into a current sensor to shield a magnetic field sensing element and associated circuitry in the current sensor from electrical, voltage, or electrical transient noise. In an embodiment, a shield layer may be disposed along at least one surface of a die supporting a magnetic field sensing element. The shield layer may be disposed in various arrangements to shunt noise caused by a parasitic coupling between the magnetic field sensing element and the current carrying conductor away from the magnetic field sensing element.
    Type: Application
    Filed: May 24, 2019
    Publication date: September 19, 2019
    Applicant: Allegro MicroSystems, LLC
    Inventors: Shaun D. Milano, Bryan Cadugan, Michael C. Doogue, Alexander Latham, William P. Taylor, Harianto Wong, Sundar Chetlur
  • Publication number: 20190250220
    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.
    Type: Application
    Filed: April 25, 2019
    Publication date: August 15, 2019
    Applicant: Allegro MicroSystems, LLC
    Inventors: Alexander Latham, Michael C. Doogue, Jason Boudreau
  • Patent number: 10352969
    Abstract: Systems and methods described herein are directed towards integrating a shield layer into a current sensor to shield a magnetic field sensing element and associated circuitry in the current sensor from electrical, voltage, or electrical transient noise. In an embodiment, a shield layer may be disposed along at least one surface of a die supporting a magnetic field sensing element. The shield layer may be disposed in various arrangements to shunt noise caused by a parasitic coupling between the magnetic field sensing element and the current carrying conductor away from the magnetic field sensing element.
    Type: Grant
    Filed: November 29, 2016
    Date of Patent: July 16, 2019
    Assignee: Allegro MicroSystems, LLC
    Inventors: Shaun D. Milano, Bryan Cadugan, Michael C. Doogue, Alexander Latham, William P. Taylor, Harianto Wong, Sundar Chetlur
  • Patent number: 10333055
    Abstract: Methods for providing a sensor integrated circuit package including employing a conductive leadframe and forming a non-conductive die paddle in relation to the leadframe. The method can further include placing a die on the non-conductive die paddle to form an assembly, forming at least one electrical connection between the die and the leadframe, and overmolding the assembly to form an integrated circuit package.
    Type: Grant
    Filed: March 2, 2017
    Date of Patent: June 25, 2019
    Assignee: Allegro MicroSystems, LLC
    Inventors: Shaun D. Milano, Michael C. Doogue, William P. Taylor
  • Patent number: 10324141
    Abstract: An apparatus comprises one or more substrates and one or more coils. At least one of the coils is configured to produce a first magnetic field that induces eddy currents in a conductive target, which generates a reflected magnetic field. One or more magnetic field sensing elements supported by the one or more substrates detect the reflected magnetic field. A conductive support structure supports the one or more substrates. The support structure includes a gap in an area adjacent to the one or more coils so that the support structure does not generate a reflected magnetic field in response to the first magnetic field.
    Type: Grant
    Filed: May 26, 2017
    Date of Patent: June 18, 2019
    Assignee: Allegro MicroSystems, LLC
    Inventors: Alexander Latham, Michael C. Doogue, Jason Boudreau
  • Patent number: 10310028
    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.
    Type: Grant
    Filed: May 26, 2017
    Date of Patent: June 4, 2019
    Assignees: Allegro MicroSystems, LLC, Commissariat à l'énergie atomique et aux énergies alternatives
    Inventors: Alexander Latham, Michael C. Doogue, Claude Fermon, Xavier Du Hamel De Milly, Myriam Pannetier-Lecoeur
  • Patent number: 10234513
    Abstract: A magnetic field sensor includes a lead frame, a semiconductor die supporting a magnetic field sensing element, a non-conductive mold material enclosing the die and a portion of the lead frame, a ferromagnetic mold material secured to the non-conductive mold material and a securing mechanism to securely engage the mold materials. The ferromagnetic mold material may comprise a soft ferromagnetic material to form a concentrator or a hard ferromagnetic material to form a bias magnet. The ferromagnetic mold material may be tapered and includes a non-contiguous central region, as may be an aperture or may contain the non-conductive mold material or an overmold material. Further embodiments include die up, lead on chip, and flip-chip arrangements, wafer level techniques to form the concentrator or bias magnet, integrated components, such as capacitors, on the lead frame, and a bias magnet with one or more channels to facilitate overmolding.
    Type: Grant
    Filed: March 20, 2012
    Date of Patent: March 19, 2019
    Assignee: Allegro MicroSystems, LLC
    Inventors: Ravi Vig, William P. Taylor, Andreas P. Friedrich, Paul David, Marie-Adelaide Lo, Eric Burdette, Eric Shoemaker, Michael C. Doogue
  • Publication number: 20190067562
    Abstract: Methods and apparatus for a signal isolator having a dielectric interposer supporting first and second die each having a magnetic field sensing element. A first signal path extends from the first die to the second die and a second signal path extends from the second die to the first die. In embodiments, the first signal path is located in the interposer and includes a first coil to generate a magnetic field and the second signal path is located in the interposer and includes a second coil to generate a magnetic filed. The first coil is located in relation to the second magnetic field sensing element of the second die and the second coil is located in relation to the first magnetic field sensing element of the first die.
    Type: Application
    Filed: August 29, 2017
    Publication date: February 28, 2019
    Applicant: Allegro MicroSystems, LLC
    Inventors: Sundar Chetlur, Harianto Wong, Maxim Klebanov, William P. Taylor, Michael C. Doogue
  • Publication number: 20190049527
    Abstract: A magnetic field sensor includes a lead frame, a passive component, semiconductor die supporting a magnetic field sensing element and attached to the lead frame, a non-conductive mold material enclosing the die and at least a portion of the lead frame, and a ferromagnetic mold material secured to a portion of the non-conductive mold material. The lead frame has a recessed region and the passive component is positioned in the recessed region. The ferromagnetic mold material may comprise a soft ferromagnetic material to form a concentrator or a hard ferromagnetic material to form a bias magnet.
    Type: Application
    Filed: October 19, 2018
    Publication date: February 14, 2019
    Applicant: Allegro MicroSystems, LLC
    Inventors: Ravi Vig, William P. Taylor, Andreas P. Friedrich, Paul A. David, Marie-Adelaide Lo, Eric Burdette, Eric G. Shoemaker, Michael C. Doogue
  • Publication number: 20190025084
    Abstract: In one aspect, an integrated circuit (IC) includes a magnetic field sensor to detect speed and direction of angular rotation of a rotating magnetic structure. The magnetic field sensor includes at least two magnetic field sensing elements configured to sense changes in a magnetic field caused by rotation of the magnetic structure. The IC also includes an output port configured to provide an output signal of the magnetic field sensor. The frequency of the output signal indicates the speed and the direction or indicates a fault.
    Type: Application
    Filed: July 20, 2017
    Publication date: January 24, 2019
    Applicant: Allegro MicroSystems, LLC
    Inventors: Michael C. Doogue, P. Karl Scheller
  • Publication number: 20190025080
    Abstract: In one aspect, an integrated circuit (IC) includes a magnetic field sensor to detect speed and direction of angular rotation of a rotating magnetic structure. The magnetic field sensor includes at least two magnetic field sensing elements configured to sense changes in a magnetic field caused by rotation of the magnetic structure. The IC also includes an output port configured to provide an output signal of the magnetic field sensor. A duty cycle percentage of the output signal indicates the speed and the direction or indicates a fault.
    Type: Application
    Filed: July 20, 2017
    Publication date: January 24, 2019
    Applicant: Allegro MicroSystems, LLC
    Inventors: Michael C. Doogue, P. Karl Scheller
  • Publication number: 20180340987
    Abstract: An apparatus comprises one or more substrates and one or more coils. At least one of the coils is configured to produce a first magnetic field that induces eddy currents in a conductive target, which generates a reflected magnetic field. One or more magnetic field sensing elements supported by the one or more substrates detect the reflected magnetic field. A conductive support structure supports the one or more substrates. The support structure includes a gap in an area adjacent to the one or more coils so that the support structure does not generate a reflected magnetic field in response to the first magnetic field.
    Type: Application
    Filed: May 26, 2017
    Publication date: November 29, 2018
    Applicant: Allegro MicroSystems, LLC
    Inventors: Alexander Latham, Michael C. Doogue, Jason Boudreau