Patents by Inventor Phillip G. Mather
Phillip G. Mather 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).
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Patent number: 11733317Abstract: A chopping technique, and associated structure, is implemented to cancel the magnetic 1/f noise contribution in a Tunneling Magnetoresistance (TMR) field sensor. The TMR field sensor includes a first bridge circuit including multiple TMR elements to sense a magnetic field and a second circuit to apply a bipolar current pulse adjacent to each TMR element. The current lines are serially or sequentially connected to a current source to receive the bipolar current pulse. The field sensor has an output including a high output and a low output in response to the bipolar pulse. This asymmetric response allows a chopping technique for 1/f noise reduction in the field sensor.Type: GrantFiled: May 3, 2022Date of Patent: August 22, 2023Assignee: EVERSPIN TECHNOLOGIES, INC.Inventors: Bradley Neal Engel, Phillip G. Mather
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Publication number: 20230243898Abstract: Various means for improvement in signal-to-noise ratio (SNR) for a magnetic field sensor are disclosed for low power and high resolution magnetic sensing. The improvements may be done by reducing parasitic effects, increasing sense element packing density, interleaving a Z-axis layout to reduce a subtractive effect, and optimizing an alignment between a Z-axis sense element and a flux guide, etc.Type: ApplicationFiled: April 11, 2023Publication date: August 3, 2023Applicant: EVERSPIN TECHNOLOGIES, INC.Inventors: Phillip G. MATHER, Anuraag MOHAN
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Patent number: 11656300Abstract: Various means for improvement in signal-to-noise ratio (SNR) for a magnetic field sensor are disclosed for low power and high resolution magnetic sensing. The improvements may be done by reducing parasitic effects, increasing sense element packing density, interleaving a Z-axis layout to reduce a subtractive effect, and optimizing an alignment between a Z-axis sense element and a flux guide, etc.Type: GrantFiled: September 16, 2020Date of Patent: May 23, 2023Assignee: EVERSPIN TECHNOLOGIES, INC.Inventors: Phillip G. Mather, Anuraag Mohan
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Publication number: 20220260651Abstract: A chopping technique, and associated structure, is implemented to cancel the magnetic 1/f noise contribution in a Tunneling Magnetoresistance (TMR) field sensor. The TMR field sensor includes a first bridge circuit including multiple TMR elements to sense a magnetic field and a second circuit to apply a bipolar current pulse adjacent to each TMR element. The current lines are serially or sequentially connected to a current source to receive the bipolar current pulse. The field sensor has an output including a high output and a low output in response to the bipolar pulse. This asymmetric response allows a chopping technique for 1/f noise reduction in the field sensor.Type: ApplicationFiled: May 3, 2022Publication date: August 18, 2022Applicant: EVERSPIN TECHNOLOGIES, INC.Inventors: Bradley Neal ENGEL, Phillip G. MATHER
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Patent number: 11353520Abstract: A chopping technique, and associated structure, is implemented to cancel the magnetic 1/f noise contribution in a Tunneling Magnetoresistance (TMR) field sensor. The TMR field sensor includes a first bridge circuit including multiple TMR elements to sense a magnetic field and a second circuit to apply a bipolar current pulse adjacent to each TMR element. The current lines are serially or sequentially connected to a current source to receive the bipolar current pulse. The field sensor has an output including a high output and a low output in response to the bipolar pulse. This asymmetric response allows a chopping technique for 1/f noise reduction in the field sensor.Type: GrantFiled: January 12, 2021Date of Patent: June 7, 2022Assignee: EVERSPIN TECHNOLOGIES, INC.Inventors: Bradley Neal Engel, Phillip G. Mather
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Publication number: 20210199729Abstract: A chopping technique, and associated structure, is implemented to cancel the magnetic 1/f noise contribution in a Tunneling Magnetoresistance (TMR) field sensor. The TMR field sensor includes a first bridge circuit including multiple TMR elements to sense a magnetic field and a second circuit to apply a bipolar current pulse adjacent to each TMR element. The current lines are serially or sequentially connected to a current source to receive the bipolar current pulse. The field sensor has an output including a high output and a low output in response to the bipolar pulse. This asymmetric response allows a chopping technique for 1/f noise reduction in the field sensor.Type: ApplicationFiled: January 12, 2021Publication date: July 1, 2021Applicant: EVERSPIN TECHNOLOGIES, INC.Inventors: Bradley Neal ENGEL, Phillip G. MATHER
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Patent number: 10928463Abstract: A chopping technique, and associated structure, is implemented to cancel the magnetic 1/f noise contribution in a Tunneling Magnetoresistance (TMR) field sensor. The TMR field sensor includes a first bridge circuit including multiple TMR elements to sense a magnetic field and a second circuit to apply a bipolar current pulse adjacent to each TMR element. The current lines are serially or sequentially connected to a current source to receive the bipolar current pulse. The field sensor has an output including a high output and a low output in response to the bipolar pulse. This asymmetric response allows a chopping technique for 1/f noise reduction in the field sensor.Type: GrantFiled: March 20, 2019Date of Patent: February 23, 2021Assignee: EVERSPIN TECHNOLOGIES, INC.Inventors: Bradley Neal Engel, Phillip G. Mather
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Publication number: 20200408858Abstract: Various means for improvement in signal-to-noise ratio (SNR) for a magnetic field sensor are disclosed for low power and high resolution magnetic sensing. The improvements may be done by reducing parasitic effects, increasing sense element packing density, interleaving a Z-axis layout to reduce a subtractive effect, and optimizing an alignment between a Z-axis sense element and a flux guide, etc.Type: ApplicationFiled: September 16, 2020Publication date: December 31, 2020Applicant: EVERSPIN TECHNOLOGIES, INC.Inventors: Phillip G. MATHER, Anuraag MOHAN
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Patent number: 10809320Abstract: Various means for improvement in signal-to-noise ratio (SNR) for a magnetic field sensor are disclosed for low power and high resolution magnetic sensing. The improvements may be done by reducing parasitic effects, increasing sense element packing density, interleaving a Z-axis layout to reduce a subtractive effect, and optimizing an alignment between a Z-axis sense element and a flux guide, etc.Type: GrantFiled: April 28, 2016Date of Patent: October 20, 2020Assignee: EVERSPIN TECHNOLOGIES, INC.Inventors: Phillip G. Mather, Anuraag Mohan
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Publication number: 20190212399Abstract: A chopping technique, and associated structure, is implemented to cancel the magnetic 1/f noise contribution in a Tunneling Magnetoresistance (TMR) field sensor. The TMR field sensor comprises a first bridge circuit including multiple TMR elements to sense a magnetic field and a second circuit to apply a bipolar current pulse adjacent to each TMR element. The current lines are serially or sequentially connected to a current source to receive the bipolar current pulse. The field sensor has an output comprising a high output and a low output in response to the bipolar pulse. This asymmetric response allows a chopping technique for 1/f noise reduction in the field sensor.Type: ApplicationFiled: March 20, 2019Publication date: July 11, 2019Applicant: EVERSPIN TECHNOLOGIES, INC.Inventors: Bradley Neal ENGEL, Phillip G. MATHER
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Patent number: 10281531Abstract: A chopping technique, and associated structure, is implemented to cancel the magnetic 1/f noise contribution in a Tunneling Magnetoresistance (TMR) field sensor. The TMR field sensor includes a first bridge circuit including multiple TMR elements to sense a magnetic field and a second circuit to apply a bipolar current pulse adjacent to each TMR element. The current lines are serially or sequentially connected to a current source to receive the bipolar current pulse. The field sensor has an output comprising a high output and a low output in response to the bipolar pulse. This asymmetric response allows a chopping technique for 1/f noise reduction in the field sensor.Type: GrantFiled: November 4, 2016Date of Patent: May 7, 2019Assignee: EVERSPIN TECHNOLOGIES, INC.Inventors: Bradley Neal Engel, Phillip G. Mather
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Patent number: 10168397Abstract: A magnetic field sensor includes a plurality of transducer legs coupled together as a first circuit to sense a magnetic field, wherein each transducer leg comprises a plurality of magnetoresistance sense elements. The magnetic field sensor also includes a second circuit including a first plurality of current lines, wherein each current line of the first plurality of current lines is adjacent to a corresponding plurality of magnetoresistance sense elements of a transducer leg of the plurality of transducer legs. When at least one current line of the first plurality of current lines is energized, a magnetization of each magnetoresistance sense element of the transducer leg is aligned in a first direction or a second direction opposite to the first direction. A routing pattern of the at least one current line is configured to generate an equal population of magnetoresistance sense elements with magnetization aligned in the first and second directions.Type: GrantFiled: January 31, 2018Date of Patent: January 1, 2019Assignee: Everspin Technologies, Inc.Inventors: Phillip G. Mather, Bradley Neal Engel, Guido De Sandre
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Patent number: 10012707Abstract: A magnetic field sensor includes built-in self-test coils in a configuration to provide magnetic field stimulation along three axes, with a high field factor, and thus, reduce a power budget of the sensor and physical size of the self-test coils. The magnetic field sensor comprises a first bridge circuit including a plurality of sense elements configured to sense a magnetic field. The magnetic field sensor further comprises re-configurable self-test current lines coupled to a self-test source to perform high field, high power wafer and die level testing and trim, as well as low power in-situ characterization and calibration of the sensor. The self-test current lines may be routed to form a coil with multiple turns around the TMR elements.Type: GrantFiled: April 27, 2016Date of Patent: July 3, 2018Assignee: Everspin Technologies, Inc.Inventors: Phillip G. Mather, Anuraag Mohan, Guido De Sandre
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Publication number: 20180156876Abstract: A magnetic field sensor includes a plurality of transducer legs coupled together as a first circuit to sense a magnetic field, wherein each transducer leg comprises a plurality of magnetoresistance sense elements. The magnetic field sensor also includes a second circuit including a first plurality of current lines, wherein each current line of the first plurality of current lines is adjacent to a corresponding plurality of magnetoresistance sense elements of a transducer leg of the plurality of transducer legs. When at least one current line of the first plurality of current lines is energized, a magnetization of each magnetoresistance sense element of the transducer leg is aligned in a first direction or a second direction opposite to the first direction. A routing pattern of the at least one current line is configured to generate an equal population of magnetoresistance sense elements with magnetization aligned in the first and second directions.Type: ApplicationFiled: January 31, 2018Publication date: June 7, 2018Applicant: Everspin Technologies, Inc.Inventors: Phillip G. Mather, Bradley Neal Engel, Guido De Sandre
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Patent number: 9910106Abstract: A magnetic field sensor includes a plurality of transducer legs coupled together as a first circuit to sense a magnetic field, wherein each transducer leg comprises a plurality of magnetoresistance sense elements. The magnetic field sensor also includes a second circuit including a first plurality of current lines, wherein each current line of the first plurality of current lines is adjacent to a corresponding plurality of magnetoresistance sense elements of a transducer leg of the plurality of transducer legs. When at least one current line of the first plurality of current lines is energized, a magnetization of each magnetoresistance sense element of the transducer leg is aligned in a first direction or a second direction opposite to the first direction. A routing pattern of the at least one current line is configured to generate an equal population of magnetoresistance sense elements with magnetization aligned in the first and second directions.Type: GrantFiled: April 20, 2016Date of Patent: March 6, 2018Assignee: Everspin Technologies, Inc.Inventors: Phillip G. Mather, Bradley Neal Engel, Guido De Sandre
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Patent number: 9632150Abstract: In one embodiment, a TMR field sensor utilizes existing one or more self-test current lines in a configuration to extend magnetic field measurement range without sacrificing measurement sensitivity. The self-test current lines are energized to facilitate magnetic field measurement when the measured magnetic field reaches a threshold. The magnetic field created by self-test coil opposes an external magnetic field being measured to keep the net magnetic field within a desired range where the magnetic field sensor has linear output and desired sensitivity.Type: GrantFiled: April 14, 2016Date of Patent: April 25, 2017Assignee: EVERSPIN TECHNOLOGIES, INC.Inventors: Anuraag Mohan, Phillip G. Mather
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Publication number: 20170074948Abstract: A chopping technique, and associated structure, is implemented to cancel the magnetic 1/f noise contribution in a Tunneling Magnetoresistance (TMR) field sensor. The TMR field sensor comprises a first bridge circuit including multiple TMR elements to sense a magnetic field and a second circuit to apply a bipolar current pulse adjacent to each TMR element. The current lines are serially or sequentially connected to a current source to receive the bipolar current pulse. The field sensor has an output comprising a high output and a low output in response to the bipolar pulse. This asymmetric response allows a chopping technique for 1/f noise reduction in the field sensor.Type: ApplicationFiled: November 4, 2016Publication date: March 16, 2017Applicant: EVERSPIN TECHNOLOGIES, INC.Inventors: Bradley Neal ENGEL, Phillip G. MATHER
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Patent number: 9519034Abstract: A chopping technique, and associated structure, is implemented to cancel the magnetic 1/f noise contribution in a Tunneling Magnetoresistance (TMR) field sensor. The TMR field sensor includes a first bridge circuit including multiple TMR elements to sense a magnetic field and a second circuit to apply a bipolar current pulse adjacent to each TMR element. The current lines are serially or sequentially connected to a current source to receive the bipolar current pulse. The field sensor provides a high output and a low output in response to the bipolar pulse. This asymmetric response allows a chopping technique for 1/f noise reduction in the field sensor.Type: GrantFiled: September 24, 2014Date of Patent: December 13, 2016Assignee: EVERSPIN TECHNOLOGIES, INC.Inventors: Bradley Neal Engel, Phillip G. Mather
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Publication number: 20160320460Abstract: Various means for improvement in signal-to-noise ratio (SNR) for a magnetic field sensor are disclosed for low power and high resolution magnetic sensing. The improvements may be done by reducing parasitic effects, increasing sense element packing density, interleaving a Z-axis layout to reduce a subtractive effect, and optimizing an alignment between a Z-axis sense element and a flux guide, etc.Type: ApplicationFiled: April 28, 2016Publication date: November 3, 2016Applicant: EVERSPIN TECHNOLOGIES, INC.Inventors: Phillip G. MATHER, Anuraag MOHAN
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Publication number: 20160320459Abstract: A system, device, and method are disclosed for a tunneling magnetoresistance (TMR) magnetic sensor to effectively increase magnetic field measurement linearity and minimize cross-axis interference. The TMR magnetic sensor comprises a plurality of transducer legs, each having multiple sense elements. The TMR magnetic sensor comprises a plurality of built-in current lines located adjacent to each sense element. The current lines are routed such that two or more sense elements have magnetic responses that have opposing contributions from the cross-axis effect for a given field direction in each transducer leg within the TMR magnetic sensor. Therefore, the overall field response from each transducer leg is internally compensated and the TMR magnetic sensor has an output with minimal cross-axis interference.Type: ApplicationFiled: April 20, 2016Publication date: November 3, 2016Applicant: EVERSPIN TECHNOLOGIES, INC.Inventors: Phillip G. MATHER, Bradley Neal ENGEL, Guido DE SANDRE