Patents by Inventor Paige M. Holm

Paige M. Holm 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).

  • Patent number: 10545196
    Abstract: A magnetic field sensor for sensing an external magnetic field along a sensing direction comprises a sensor bridge. The sensor bridge has a first sensor leg that includes a first magnetoresistive sense element and a second sensor leg that includes a second magnetoresistive sense element. The first and second sense elements have respective a first and second pinned layers having corresponding first and second reference magnetizations. The second reference magnetization is oriented in an opposing direction relative to the first reference magnetization. The first and second sense elements have respective first and second sense layers, each having an indeterminate magnetization state. A permanent magnet layer is proximate the magnetoresistive sense elements. In the absence of an external magnetic field, the permanent magnet layer magnetically biases the indeterminate magnetization state of each sense layer in an in-plane orientation to produce a sense magnetization of the first and second sense layers.
    Type: Grant
    Filed: March 24, 2016
    Date of Patent: January 28, 2020
    Assignee: NXP USA, Inc.
    Inventors: Paige M. Holm, Lianjun Lu
  • Publication number: 20190234820
    Abstract: A piezoresistive transducer includes a substrate having a mechanical structure that is subject to an applied force. A bridge circuit, formed at least in part on the mechanical structure, includes a first half and a second half. The first half of the bridge circuit has a first junction field-effect transistor (JFET) and a first piezoresistor coupled in series, and the second half of the bridge circuit has a second JFET and a second piezoresistor coupled in series. The piezoresistive transducer may be a piezoresistive pressure sensor, the mechanical structure may be a diaphragm, and the applied force may be an applied pressure.
    Type: Application
    Filed: January 29, 2018
    Publication date: August 1, 2019
    Inventor: Paige M. Holm
  • Patent number: 10260981
    Abstract: A pressure sensor includes a diaphragm suspended across a cavity in a substrate. A first group of piezoresistors is provided in the diaphragm, the piezoresistors of the first group being coupled to one another to form a first Wheatstone bridge having first positive and negative output nodes. A second group of piezoresistors is provided in the diaphragm, the piezoresistors of the second group being coupled to one another to form a second Wheatstone bridge having second positive and negative output nodes. The first negative output node of the first Wheatstone bridge is electrically connected to the second positive output node of the second Wheatstone bridge to directly chain the outputs of the Wheatstone bridges. The first and second Wheatstone bridges each produce an output signal as a function of an external pressure stimulus that is combined via the chained arrangement of the Wheatstone bridges to produce a composite output signal.
    Type: Grant
    Filed: February 6, 2017
    Date of Patent: April 16, 2019
    Assignee: NXP USA, Inc.
    Inventors: Paige M. Holm, Mark Edward Schlarmann
  • Patent number: 10215653
    Abstract: A sensor includes groups of sense elements coupled to one another to form multiple Wheatstone bridges, each being configured to produce an output voltage across first and second output nodes. A signal interface circuit for the sensor includes switched capacitor structures, one each of the switched capacitor structures being associated with one each of the Wheatstone bridges. Each switched capacitor structure includes a capacitor having first and second terminals, a first switch for selectively interconnecting the first node of an associated Wheatstone bridge with the first terminal of the capacitor, and a second switch for selectively interconnecting the second node of the associated Wheatstone bridge with the second terminal of the capacitor. A switch state element toggles the first and second switches between a charge state and a readout state to provide a readout voltage that is equivalent to a summation of the voltage outputs of the Wheatstone bridges.
    Type: Grant
    Filed: April 6, 2017
    Date of Patent: February 26, 2019
    Assignee: NXP USA, Inc.
    Inventors: Paige M. Holm, Lianjun Liu
  • Patent number: 10145907
    Abstract: A magnetic field sensor for sensing an external magnetic field along a sensing direction oriented perpendicular to a plane of the magnetic field sensor comprises a sensor bridge. The sensor bridge has a first sensor leg that includes a first magnetoresistive sense element and a second sensor leg that includes a second magnetoresistive sense element. The first and second sense elements include respective first and second pinned layers having corresponding first and second reference magnetizations within the plane and oriented in the same direction. The first and second sense elements further include respective first and second sense layers, each having an indeterminate magnetization state. A permanent magnet layer is proximate the magnetoresistive sense elements. In the absence of an external magnetic field, the permanent magnet layer magnetically biases the indeterminate magnetization state of each sense layer to produce a sense magnetization of the first and second sense layers.
    Type: Grant
    Filed: April 7, 2016
    Date of Patent: December 4, 2018
    Assignee: NXP USA, Inc.
    Inventors: Paige M. Holm, Lianjun Liu
  • Publication number: 20180292280
    Abstract: A sensor includes groups of sense elements coupled to one another to form multiple Wheatstone bridges, each being configured to produce an output voltage across first and second output nodes. A signal interface circuit for the sensor includes switched capacitor structures, one each of the switched capacitor structures being associated with one each of the Wheatstone bridges. Each switched capacitor structure includes a capacitor having first and second terminals, a first switch for selectively interconnecting the first node of an associated Wheatstone bridge with the first terminal of the capacitor, and a second switch for selectively interconnecting the second node of the associated Wheatstone bridge with the second terminal of the capacitor. A switch state element toggles the first and second switches between a charge state and a readout state to provide a readout voltage that is equivalent to a summation of the voltage outputs of the Wheatstone bridges.
    Type: Application
    Filed: April 6, 2017
    Publication date: October 11, 2018
    Inventors: Paige M. Holm, Lianjun Liu
  • Publication number: 20180224348
    Abstract: A pressure sensor includes a diaphragm suspended across a cavity in a substrate. A first group of piezoresistors is provided in the diaphragm, the piezoresistors of the first group being coupled to one another to form a first Wheatstone bridge having first positive and negative output nodes. A second group of piezoresistors is provided in the diaphragm, the piezoresistors of the second group being coupled to one another to form a second Wheatstone bridge having second positive and negative output nodes. The first negative output node of the first Wheatstone bridge is electrically connected to the second positive output node of the second Wheatstone bridge to directly chain the outputs of the Wheatstone bridges. The first and second Wheatstone bridges each produce an output signal as a function of an external pressure stimulus that is combined via the chained arrangement of the Wheatstone bridges to produce a composite output signal.
    Type: Application
    Filed: February 6, 2017
    Publication date: August 9, 2018
    Inventors: Paige M. Holm, Mark Edward Schlarmann
  • Patent number: 9933496
    Abstract: A sensor for sensing an external magnetic field along a sensing direction comprises a sensor bridge. The sensor bridge has a first sensor leg that includes a first magnetoresistive sense element and a second sensor leg that includes a second magnetoresistive sense element. The first and second sense elements have respective first and second pinned layers having the same reference magnetization. The first and second sense elements have respective first and second sense layers, each self-biased to have a first sense magnetization. A permanent magnet layer is proximate the second sense element. In the absence of an external magnetic field, the permanent magnet layer magnetically biases the first sense magnetization of the second sense layer produce a second sense magnetization of the second sense layer that differs from the first sense magnetization, and the first sense layer of the first sense element retains the first sense magnetization.
    Type: Grant
    Filed: April 21, 2016
    Date of Patent: April 3, 2018
    Assignee: NXP USA, Inc.
    Inventors: Paige M. Holm, Lianjun Liu
  • Publication number: 20180053698
    Abstract: A system includes three related structures. A first structure includes a first finger interposed between a first pair of sidewalls. The first finger has a first length and a first width, and is separated from each of the sidewalls by a first gap having a first spacing. A second structure includes a second finger interposed between a second pair of sidewalls. The second finger has a second length and the first width, and is separated from each of the sidewalls by a second gap having a second spacing. A third structure includes a third finger interposed between a third pair of sidewalls. The third finger has the second length and a second width, and is separated from each of the sidewalls by a third gap having a second spacing. Resistance and capacitance measurements of the three structures are used to extract critical parameters resulting from a semiconductor device fabrication process.
    Type: Application
    Filed: August 18, 2016
    Publication date: February 22, 2018
    Inventors: Paige M. Holm, Lianjun Liu
  • Patent number: 9897667
    Abstract: A magnetic field sensor comprises a sensor bridge having multiple sensor legs. Each sensor leg includes magnetoresistive sense elements located in a plane of the magnetic field sensor. Each sense element comprises a pinned layer and a sense layer. The pinned layer has a reference magnetization oriented parallel to the plane and the sense layer has a sense magnetization oriented out-of-plane. A permanent magnet layer may be spaced apart from the sense elements which magnetically biases the sense magnetization of the sense layer into an out-of-plane direction that is non-perpendicular to the plane of the sensor. The sense magnetization is orientable from the out-of-plane direction toward the plane of the sensor in response to an external magnetic field. The permanent magnet layer enables detection of the external magnetic field in a sensing direction that is also perpendicular to the plane of the magnetic field sensor.
    Type: Grant
    Filed: January 26, 2016
    Date of Patent: February 20, 2018
    Assignee: NXP USA, Inc.
    Inventors: Paige M. Holm, Lianjun Liu
  • Patent number: 9857435
    Abstract: A sensor package includes a magnetic field sensor and a corruption detection and reset subsystem. The magnetic field sensor has a magnetic sense element and a ferromagnetic structure characterized by a baseline magnetic state. The subsystem includes a detector element, a processor, and current carrying structure positioned in proximity to the ferromagnetic structure. Methodology performed by the subsystem entails detecting at the detector element an altered magnetic state of the ferromagnetic structure, where the altered magnetic state differs from the baseline magnetic state. Methodology further entails determining, at the processor, when a reset action is needed in response to the altered magnetic state and applying a reset magnetic field to the ferromagnetic structure to reset the ferromagnetic structure from the altered magnetic state to the baseline magnetic state.
    Type: Grant
    Filed: May 12, 2015
    Date of Patent: January 2, 2018
    Assignee: NXP USA, Inc.
    Inventors: Paige M. Holm, Lianjun Liu
  • Patent number: 9841469
    Abstract: A magnetic field sensor comprises a sensor bridge having multiple sensor legs. Each sensor leg includes magnetoresistive sense elements, each comprising a pinned layer having a reference magnetization parallel to a plane of the sensor and a sense layer having a sense magnetization. A permanent magnet layer spaced apart from the sense elements magnetically biases the sense magnetization into an out-of-plane direction that is non-perpendicular to the plane of the sensor. The sense magnetization of a portion of the sense elements is oriented in a first direction and the sense magnetization of a different portion of the sense elements is oriented in a second direction differing from the first direction to generate two unique bias field vectors of the sense layers which enables detection of the external magnetic field in a sensing direction that is perpendicular to the plane of the magnetic field sensor without inter-axis coupling of sensor response.
    Type: Grant
    Filed: January 26, 2016
    Date of Patent: December 12, 2017
    Assignee: NXP USA, Inc.
    Inventors: Paige M. Holm, Lianjun Liu
  • Patent number: 9818712
    Abstract: A device package includes a substrate having an active surface. Electrical connection bumps are deposited on the active surface and are arranged in an array having a perimeter. At least one electronic component is formed at a region of the active surface, where the region is located outside of the perimeter of the array of electrical connection bumps. When the device package is coupled with external circuitry via the electrical connection bumps, the region at which the electronic component is formed is suspended over the electronic circuitry. This region is subject to a lower stress profile than a region of the active surface circumscribed by the perimeter. Thus, stress sensitive electronic components can be located in this lower stress region of the active surface.
    Type: Grant
    Filed: January 14, 2015
    Date of Patent: November 14, 2017
    Assignee: NXP USA, Inc.
    Inventors: Paige M. Holm, Vijay Sarihan
  • Publication number: 20170307697
    Abstract: A sensor for sensing an external magnetic field along a sensing direction comprises a sensor bridge. The sensor bridge has a first sensor leg that includes a first magnetoresistive sense element and a second sensor leg that includes a second magnetoresistive sense element. The first and second sense elements have respective first and second pinned layers having the same reference magnetization. The first and second sense elements have respective first and second sense layers, each self-biased to have a first sense magnetization. A permanent magnet layer is proximate the second sense element. In the absence of an external magnetic field, the permanent magnet layer magnetically biases the first sense magnetization of the second sense layer produce a second sense magnetization of the second sense layer that differs from the first sense magnetization, and the first sense layer of the first sense element retains the first sense magnetization.
    Type: Application
    Filed: April 21, 2016
    Publication date: October 26, 2017
    Inventors: Paige M. Holm, Lianjun Liu
  • Publication number: 20170293001
    Abstract: A magnetic field sensor for sensing an external magnetic field along a sensing direction oriented perpendicular to a plane of the magnetic field sensor comprises a sensor bridge. The sensor bridge has a first sensor leg that includes a first magnetoresistive sense element and a second sensor leg that includes a second magnetoresistive sense element. The first and second sense elements include respective first and second pinned layers having corresponding first and second reference magnetizations within the plane and oriented in the same direction. The first and second sense elements further include respective first and second sense layers, each having an indeterminate magnetization state. A permanent magnet layer is proximate the magnetoresistive sense elements. In the absence of an external magnetic field, the permanent magnet layer magnetically biases the indeterminate magnetization state of each sense layer to produce a sense magnetization of the first and second sense layers.
    Type: Application
    Filed: April 7, 2016
    Publication date: October 12, 2017
    Inventors: Paige M. Holm, Lianjun Liu
  • Publication number: 20170276738
    Abstract: A magnetic field sensor for sensing an external magnetic field along a sensing direction comprises a sensor bridge. The sensor bridge has a first sensor leg that includes a first magnetoresistive sense element and a second sensor leg that includes a second magnetoresistive sense element. The first and second sense elements have respective a first and second pinned layers having corresponding first and second reference magnetizations. The second reference magnetization is oriented in an opposing direction relative to the first reference magnetization. The first and second sense elements have respective first and second sense layers, each having an indeterminate magnetization state. A permanent magnet layer is proximate the magnetoresistive sense elements. In the absence of an external magnetic field, the permanent magnet layer magnetically biases the indeterminate magnetization state of each sense layer in an in-plane orientation to produce a sense magnetization of the first and second sense layers.
    Type: Application
    Filed: March 24, 2016
    Publication date: September 28, 2017
    Inventors: Paige M. Holm, Lianjun Lu
  • Patent number: 9739842
    Abstract: A magnetic field sensor comprises a sensor bridge having multiple sensor legs. Each sensor leg includes magnetoresistive sense elements, each comprising a pinned layer having a reference magnetization parallel to a plane of the sensor and a sense layer having a sense magnetization that is skewed away from three orthogonal axes. The sense magnetization of a portion of the sense elements is oriented in a first direction and the sense magnetization of a different portion of the sense elements is magnetically biased in a second direction by a permanent magnet layer. The second direction differs from the first direction by an opposing angular magnitude to yield a balanced sensor bridge that produces a zero-offset outcome in the absence of an external magnetic field.
    Type: Grant
    Filed: January 26, 2016
    Date of Patent: August 22, 2017
    Assignee: NXP USA, Inc.
    Inventors: Paige M. Holm, Lianjun Liu
  • Patent number: 9720051
    Abstract: A magnetic field sensor includes in-plane sense elements located in a plane of the magnetic field sensor and configured to detect a magnetic field oriented perpendicular to the plane. A current carrying structure is positioned proximate the magnetic field sensor and includes at least one coil surrounding the in-plane sense elements. An electric current is applied to the coil to create a self-test magnetic field to be sensed by the sense elements. The coil may be vertically displaced from the plane in which the sense elements are located and laterally displaced from an area occupied by the sense elements to produce both Z-axis magnetic field components and lateral magnetic field components of the self-test magnetic field. The sense elements are arranged within the coil and interconnected to cancel the lateral magnetic field components, while retaining the Z-axis magnetic field components to be used for self-test of the magnetic field sensor.
    Type: Grant
    Filed: May 29, 2014
    Date of Patent: August 1, 2017
    Assignee: NXP USA, Inc.
    Inventors: Paige M. Holm, Lianjun Liu
  • Publication number: 20170212189
    Abstract: A magnetic field sensor comprises a sensor bridge having multiple sensor legs. Each sensor leg includes magnetoresistive sense elements located in a plane of the magnetic field sensor. Each sense element comprises a pinned layer and a sense layer. The pinned layer has a reference magnetization oriented parallel to the plane and the sense layer has a sense magnetization oriented out-of-plane. A permanent magnet layer may be spaced apart from the sense elements which magnetically biases the sense magnetization of the sense layer into an out-of-plane direction that is non-perpendicular to the plane of the sensor. The sense magnetization is orientable from the out-of-plane direction toward the plane of the sensor in response to an external magnetic field. The permanent magnet layer enables detection of the external magnetic field in a sensing direction that is also perpendicular to the plane of the magnetic field sensor.
    Type: Application
    Filed: January 26, 2016
    Publication date: July 27, 2017
    Inventors: Paige M. Holm, Lianjun Liu
  • Publication number: 20170212175
    Abstract: A magnetic field sensor comprises a sensor bridge having multiple sensor legs. Each sensor leg includes magnetoresistive sense elements, each comprising a pinned layer having a reference magnetization parallel to a plane of the sensor and a sense layer having a sense magnetization. A permanent magnet layer spaced apart from the sense elements magnetically biases the sense magnetization into an out-of-plane direction that is non-perpendicular to the plane of the sensor. The sense magnetization of a portion of the sense elements is oriented in a first direction and the sense magnetization of a different portion of the sense elements is oriented in a second direction differing from the first direction to generate two unique bias field vectors of the sense layers which enables detection of the external magnetic field in a sensing direction that is perpendicular to the plane of the magnetic field sensor without inter-axis coupling of sensor response.
    Type: Application
    Filed: January 26, 2016
    Publication date: July 27, 2017
    Inventors: Paige M. Holm, Lianjun Liu