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1.发明申请公开(公告)号：US20190079143A1
公开(公告)日：2019-03-14
申请号：US15700603
申请日：2017-09-11
CPC分类号： G01R33/0041 , G01D3/036 , G01R33/0029 , H03F3/38 , H03G1/04 , H03H17/0219 , H03H17/025 , H03M3/458
摘要： A sensor circuit is provided with a chopper-stabilized amplifier circuit configured to receive a signal from at least one magnetic sensing element, a sigma-delta modulator (SDM) configured to receive a signal from the chopper-stabilized amplifier circuit, and a feedback circuit configured to reduce ripple in a signal generated by the chopper-stabilized amplifier circuit. The feedback circuit includes a demodulator to demodulate a signal from the SDM in a digital domain by inverting a bit stream of the signal from the SDM according to a frequency chopping rate, a digital integrator configured to integrate an output signal of the demodulator to form an integrated signal, and a digital-to-analog converter (DAC) configured to convert the integrated signal to an analog signal and provide the analog signal to the chopper-stabilized amplifier circuit.
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公开(公告)号：US20190025384A1
公开(公告)日：2019-01-24
申请号：US16032352
申请日：2018-07-11
申请人： ABLIC Inc.
发明人： Masao IRIGUCHI
CPC分类号： G01R33/07 , G01R33/0041 , G01R33/072 , G01R33/09 , G01R33/091 , H01L43/06 , H03F3/45071 , H03F3/45183 , H03K17/0822 , H03K17/90 , H03K17/9517
摘要： A magnetic sensor circuit includes a first type electromagnetic conversion element which supplies antiphase signals corresponding to the intensity of a magnetic field in a first direction, a second type electromagnetic conversion element which supplies antiphase signals corresponding to the intensity of a magnetic field in a second direction, a switch circuit which controls a current supplied from a current source to the first and the second type electromagnetic conversion elements, and a common mode feedback circuit which determines a midpoint voltage between the first and the second type electromagnetic conversion elements. The common mode feedback circuit performs a feedback operation to thereby set an output common voltage of the first type electromagnetic conversion element higher than the preset reference voltage and set an output common voltage of the second type electromagnetic conversion element lower than the preset reference voltage.
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公开(公告)号：US10073123B1
公开(公告)日：2018-09-11
申请号：US15335093
申请日：2016-10-26
发明人： Xiao Yu Miao
CPC分类号： G01R33/1207 , G01R19/0084 , G01R19/04 , G01R33/0041 , G11B5/6029
摘要： Systems and techniques relating to voltage signal peak level detection used in sensor devices, namely in Fly-Height Sensors (FHS) devices include, according to an aspect, an integrated chip device comprising: peak detection circuitry configured to receive a voltage signal and output a peak voltage signal associated with a peak voltage level of the voltage signal, wherein the peak detection circuitry comprises: a linear loop section configured to store the peak voltage level and hold additional voltage levels of the voltage signal at an output terminal of an amplifier to a value greater than zero; and a feedback loop section configured to reduce a leakage current within the peak detection circuitry and generate a guard voltage signal usable to reduce a feedback voltage and prevent the feedback voltage from successively re-entering into the feedback loop section.
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公开(公告)号：US09912201B2
公开(公告)日：2018-03-06
申请号：US13084510
申请日：2011-04-11
IPC分类号： H02J7/00 , H01F27/42 , H01F37/00 , H01F38/00 , H02J50/90 , G01R33/00 , G01R33/028 , H02J5/00 , H02J7/02 , H04B5/00 , H02J50/12 , H01F38/14
CPC分类号： H02J50/90 , G01R33/0041 , G01R33/028 , H01F38/14 , H02J5/005 , H02J7/025 , H02J50/10 , H02J50/12 , H04B5/0037 , H04B5/0081
摘要： The systems and methods of detecting a change in object presence in a magnetic field disclosed herein inject a low amplitude signal near the resonant frequency into the coil until the system comes to equilibrium. At this point the feedback is measured. The feedback signal can be measured as at least one of several signals, for example, but not limited to the voltage on the resonant capacitor, the current in the coil, and the voltage between the resonant capacitor and the coil. A change in the steady state response indicates a change in device presence.
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公开(公告)号：US09891290B2
公开(公告)日：2018-02-13
申请号：US15171805
申请日：2016-06-02
发明人： David Horsley , Mo Li
IPC分类号： G01R33/02 , G01R33/00 , G01R33/038
CPC分类号： G01R33/0017 , G01R33/0041 , G01R33/0385
摘要： Offsets (short and long term) are significantly reduced in a Lorentz force magnetometer circuit. A modulated bias current supplied to the magnetometer is chopped by periodically switching its polarity. Magnetometer output is demodulated, then de-chopping performed to restore signal polarity output. Chopping of the bias current signal polarity modulates magnetic field signal to a frequency in which electrostatic force remains constant toward eliminating offset and long-term drift from said micromechanical resonator.
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6.发明授权公开(公告)号：US09817083B2
公开(公告)日：2017-11-14
申请号：US13542103
申请日：2012-07-05
申请人： Hernan D. Romero
发明人： Hernan D. Romero
CPC分类号： G01R33/07 , G01R33/0041
摘要： Magnetic field sensors and associated techniques use a Hall effect element in a chopping arrangement in combination with a feedback path configured to reduce undesirable spectral components generated by the chopping.
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公开(公告)号：US09791522B2
公开(公告)日：2017-10-17
申请号：US15144019
申请日：2016-05-02
申请人： YAZAKI CORPORATION
发明人： Junya Tanigawa , Makoto Ishii , Hiroki Sugiyama
IPC分类号： G01R33/04 , G01R33/06 , G01R33/00 , G01R33/028
CPC分类号： G01R33/063 , G01R33/0017 , G01R33/0023 , G01R33/0041 , G01R33/028
摘要： A magnetic field detection sensor includes a magneto-impedance element configured to make use of the magneto-impedance effect, and a negative-feedback bias coil configured to apply a bias magnetic field to the magneto-impedance element. The magnetic field detection sensor is configured to detect an external magnetic field based on an output obtained by applying an alternating-current to the magneto-impedance element. The magneto-impedance element includes a non-magnetic substrate, and a magnetic thin-film that is provided on a surface of the non-magnetic substrate. The magnetic field detecting direction matches the longitudinal direction of the magneto-impedance element, and the magnetic thin-film is configured to have a magnetic anisotropy such that a direction of an axis of easy magnetization thereof matches the magnetic field detecting direction.
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8.发明授权公开(公告)号：US09638764B2
公开(公告)日：2017-05-02
申请号：US14681575
申请日：2015-04-08
发明人： Juan Manuel Cesaretti , Aaron Cook
CPC分类号： G01R33/0023 , G01R33/0041 , G01R33/0052 , G01R33/07 , G01R33/075
摘要： An electronic circuit can be disposed upon a semiconductor substrate. An epitaxial layer can be disposed over the semiconductor substrate. The electronic circuit can include a Hall effect element, at least a portion of the Hall effect element disposed in the epitaxial layer. The electronic circuit can further include a current generator configured to generate a drive current that passes through the Hall effect element. The current generator can include a resistor disposed in the epitaxial layer and having characteristics such that a resistance of the resistor can vary with a stress of the semiconductor substrate, resulting in changes of the drive current, to compensate for variations in the sensitivity of the Hall effect element with the stress of the substrate.
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9.发明申请公开(公告)号：US20160363638A1
公开(公告)日：2016-12-15
申请号：US14737739
申请日：2015-06-12
发明人： Steven Daubert
IPC分类号： G01R33/07
CPC分类号： G01R33/077 , G01R33/0041 , G01R33/075 , G01R33/093 , G01R33/098
摘要： A magnetic field sensor includes a phase-locked loop to receive a measured magnetic field signal formed from sensing element output signals of a plurality of magnetic field sensing elements in response to a magnetic field. The phase-locked loop is configured to generate an angle signal having a value indicative of the angle of the magnetic field. Associated methods are also described.
摘要翻译： 磁场传感器包括锁相环，用于接收由多个磁场感测元件响应于磁场的感测元件输出信号形成的测量的磁场信号。 锁相环被配置为产生具有指示磁场角度的值的角度信号。 还描述了相关方法。
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公开(公告)号：US09207288B2
公开(公告)日：2015-12-08
申请号：US13719067
申请日：2012-12-18
发明人： Masatoshi Nomura , Manabu Tamura
CPC分类号： G01R33/0041 , G01R15/205 , G01R33/00 , G01R33/02
摘要： An electrical current sensor includes a magnetic detection element whose characteristics are changed by an inductive magnetic field from a current to be measured, a plurality of coils that are connected in series with each other and which are arranged in the vicinity of the magnetic detection element, and generates a canceling magnetic field for canceling the inductive magnetic field by a feedback current flowing in the coils, and a switch circuit that selects a coil electrically connected with an input terminal and/or an output terminal of the feedback current from the plurality of coils, and controls a coil for allowing the feedback current to flow.
摘要翻译： 电流传感器包括其特性通过来自待测电流的感应磁场而变化的磁检测元件，彼此串联连接并布置在磁检测元件附近的多个线圈， 并产生用于通过在线圈中流动的反馈电流来消除感应磁场的消除磁场;以及开关电路，其选择与来自多个线圈的反馈电流的输入端子和/或输出端子电连接的线圈 并且控制用于允许反馈电流流动的线圈。
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