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公开(公告)号：US20190212399A1
公开(公告)日：2019-07-11
申请号：US16358898
申请日：2019-03-20
CPC分类号： G01R33/0029 , G01R33/06 , G01R33/09 , G01R33/098
摘要： 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.
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公开(公告)号：US20160320459A1
公开(公告)日：2016-11-03
申请号：US15134134
申请日：2016-04-20
IPC分类号： G01R33/09
CPC分类号： G01R33/091 , G01R33/096 , G01R33/098
摘要： 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.
摘要翻译： 公开了一种用于隧道磁阻（TMR）磁传感器的系统，装置和方法，以有效地增加磁场测量线性度并使跨轴干涉最小化。 TMR磁传感器包括多个换能器腿，每个具有多个感测元件。 TMR磁传感器包括位于每个感测元件附近的多个内置电流线。 当前线路由使得两个或更多个感测元件具有对TMR磁传感器内的每个换能器支路中的给定场方向的横轴效应具有相反贡献的磁响应。 因此，来自每个换能器支路的总体场响应被内部补偿，并且TMR磁传感器具有最小横轴干扰的输出。
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公开(公告)号：US20160313413A1
公开(公告)日：2016-10-27
申请号：US15098560
申请日：2016-04-14
发明人： Anuraag MOHAN , Phillip G. MATHER
CPC分类号： G01R33/098 , G01R17/10 , G01R33/0011 , G01R33/093 , G01R33/096
摘要： 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.
摘要翻译： 在一个实施例中，TMR场传感器利用配置中的现有一个或多个自测电流线来扩展磁场测量范围而不牺牲测量灵敏度。 当测量的磁场达到阈值时，自检电流线路通电以便于磁场测量。 由自测线圈产生的磁场与被测量的外部磁场相反，以将净磁场保持在磁场传感器具有线性输出和所需灵敏度的期望范围内。
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公开(公告)号：US20240241193A1
公开(公告)日：2024-07-18
申请号：US18622584
申请日：2024-03-29
发明人： Phillip G. MATHER , Anuraag MOHAN
IPC分类号： G01R33/09
CPC分类号： G01R33/093 , G01R33/098
摘要： 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.
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公开(公告)号：US20160320460A1
公开(公告)日：2016-11-03
申请号：US15141461
申请日：2016-04-28
发明人： Phillip G. MATHER , Anuraag MOHAN
IPC分类号： G01R33/09
摘要： 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.
摘要翻译： 公开了用于磁场传感器的信噪比（SNR）的各种改进用于低功率和高分辨率磁感测的装置。 可以通过减少寄生效应，增加感测元件封装密度，交错Z轴布局以减少减法效果，以及优化Z轴感测元件和磁通引导件之间的对准等来进行改进。
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公开(公告)号：US20230243898A1
公开(公告)日：2023-08-03
申请号：US18298646
申请日：2023-04-11
发明人： Phillip G. MATHER , Anuraag MOHAN
IPC分类号： G01R33/09
CPC分类号： G01R33/093 , G01R33/098
摘要： 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.
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公开(公告)号：US20220260651A1
公开(公告)日：2022-08-18
申请号：US17735185
申请日：2022-05-03
摘要： 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.
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公开(公告)号：US20210199729A1
公开(公告)日：2021-07-01
申请号：US17146516
申请日：2021-01-12
摘要： 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.
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9.发明申请BIPOLAR CHOPPING FOR 1/F NOISE AND OFFSET REDUCTION IN MAGNETIC FIELD SENSORS 审中-公开用于磁场传感器1 / F噪声和偏移减少的双极振荡公开(公告)号：US20170074948A1
公开(公告)日：2017-03-16
申请号：US15344149
申请日：2016-11-04
CPC分类号： G01R33/0029 , G01R33/06 , G01R33/09 , G01R33/098
摘要： 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.
摘要翻译： 实现斩波技术和相关联的结构以消除隧道磁阻（TMR）场传感器中的磁1 / f噪声贡献。 TMR场传感器包括包括用于感测磁场的多个TMR元件的第一桥接电路和用于施加与每个TMR元件相邻的双极电流脉冲的第二电路。 电流线串联或顺序连接到电流源以接收双极电流脉冲。 场传感器具有响应于双极性脉冲的包括高输出和低输出的输出。 这种不对称响应允许在场传感器中进行1 / f降噪的斩波技术。
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公开(公告)号：US20160320462A1
公开(公告)日：2016-11-03
申请号：US15140137
申请日：2016-04-27
CPC分类号： G01R33/098 , G01R33/0011 , G01R33/0023 , G01R33/0206
摘要： A magnetic field sensor is disclosed with 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.
摘要翻译： 公开了一种磁场传感器，其具有内置自检线圈，其构造为沿着三个轴提供磁场刺激，具有高场因子，从而降低传感器的功率预算和自检的物理尺寸 线圈 磁场传感器包括第一桥接电路，其包括被配置为感测磁场的多个感测元件。 磁场传感器还包括耦合到自检源的可重新配置的自检电流线，以执行高场，高功率晶片和管芯级测试和修整，以及传感器的低功率原位表征和校准 。 自测电流线可以被路由以形成围绕TMR元件的多个匝的线圈。
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