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公开(公告)号：US09459274B2
公开(公告)日：2016-10-04
申请号：US13958465
申请日：2013-08-02
Applicant: InvenSense, Inc.
Inventor： Derek Shaeffer , Stanley Wang
IPC: G01P1/04 , G01C19/5776
CPC classification number: G01C19/5776 , G01P1/04
Abstract: A round-robin sensing device is disclosed. The round-robin sensing device comprises a MEMS device, wherein the MEMS device includes first and second sense electrodes. The round-robin sensing device also comprises a multiplexer coupled to the first and second sense electrodes, at least one sense amplifier coupled to the multiplexer, a demodulator coupled to the at least one sense amplifier, and an integrate and dump circuit coupled to the demodulator. Finally, the round-robin sensing device comprises an analog-to-digital converter (ADC) coupled to the de-multiplexer, wherein the multiplexer, the at least one sense amplifier and the demodulator provide a continuous time sense path during amplification that is resettable and wherein the integrate and dump circuit and the ADC provide a discrete time processing path.
Abstract translation: 公开了一种循环感测装置。 循环感测装置包括MEMS装置，其中MEMS装置包括第一和第二感测电极。 循环感测装置还包括耦合到第一和第二感测电极的多路复用器，耦合到多路复用器的至少一个读出放大器，耦合到至少一个读出放大器的解调器以及耦合到解调器的积分和转储电路 。 最后，循环感测装置包括耦合到去多路复用器的模拟 - 数字转换器（ADC），其中多路复用器，至少一个读出放大器和解调器在放大期间提供可重置的连续时间感测路径 并且其中集成和转储电路和ADC提供离散的时间处理路径。
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公开(公告)号：US09304155B2
公开(公告)日：2016-04-05
申请号：US13720984
申请日：2012-12-19
Applicant: Invensense, Inc.
Inventor： Baris Cagdaser , Derek Shaeffer , Joseph Seeger
IPC: G01R27/26 , G01C19/5726 , G01D5/24
CPC classification number: G01C25/00 , G01C19/5726 , G01D5/24 , G01R27/2605
Abstract: A MEMS capacitive sensing interface includes a sense capacitor having a first terminal and a second terminal, and having associated therewith a first electrostatic force. Further included in the MEMS capacitive sensing interface is a feedback capacitor having a third terminal and a fourth terminal, the feedback capacitor having associated therewith a second electrostatic force. The second and the fourth terminals are coupled to a common mass, and a net electrostatic force includes the first and second electrostatic forces acting on the common mass. Further, a capacitance measurement circuit measures the sense capacitance and couples the first terminal and the third terminal. The capacitance measurement circuit, the sense capacitor, and the feedback capacitor define a feedback loop that substantially eliminates dependence of the net electrostatic force on a position of the common mass.
Abstract translation: MEMS电容感测接口包括具有第一端子和第二端子的感测电容器，并且具有与其相关联的第一静电力。 还包括在MEMS电容感测接口中的是具有第三端子和第四端子的反馈电容器，所述反馈电容器具有与其相关联的第二静电力。 第二和第四端子耦合到共同的质量，净静电力包括作用在公共质量上的第一和第二静电力。 此外，电容测量电路测量感测电容并耦合第一端子和第三端子。 电容测量电路，感测电容器和反馈电容器定义了基本上消除了净静电力对共同质量位置的依赖性的反馈回路。
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公开(公告)号：US09285207B2
公开(公告)日：2016-03-15
申请号：US13952281
申请日：2013-07-26
Applicant: InvenSense, Inc.
Inventor： Baris Cagdaser , Du Chen , Hasan Akyol , Derek Shaeffer
CPC classification number: G01B7/14 , G01D5/24 , G01D5/2412 , G01L1/144
Abstract: A method and system for measuring displacement of a structure is disclosed. The method and system comprise providing a first capacitance and providing a second capacitance. The first and second capacitances share a common terminal. The method and system further include determining a difference of the inverses of the value of the first and second capacitances when the structure is displaced. The first capacitance varies in inverse relation to the displacement of the structure.
Abstract translation: 公开了一种用于测量结构位移的方法和系统。 该方法和系统包括提供第一电容并提供第二电容。 第一和第二电容共享公共端子。 所述方法和系统还包括当所述结构被移位时确定所述第一和第二电容的值的反转的差异。 第一电容与结构的位移成反比关系。
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公开(公告)号：US08841958B1
公开(公告)日：2014-09-23
申请号：US13793899
申请日：2013-03-11
Applicant: InvenSense, Inc.
Inventor： Derek Shaeffer , Baris Cagdaser
Abstract: A charge pump circuit is disclosed. The charge pump circuit comprises a transfer capacitor receiving a first clock phase and a driving capacitor receiving a second clock phase, the second clock phase opposite to the first clock phase. The circuit includes a first switch coupling an input node to the transfer capacitor. The first switch being controlled by the driving capacitor. The circuit further includes a second switch coupling the input node to the driving capacitor. The second switch being controlled by the transfer capacitor. The circuit also includes a third switch coupling the transfer capacitor to an output node. The third switch being controlled by the driving capacitor. The third switch operating in phase opposition to the first switch. The circuit finally includes a charge storage capacitor coupled to the output node.
Abstract translation: 公开了电荷泵电路。 电荷泵电路包括接收第一时钟相位的转移电容器和接收第二时钟相位的驱动电容器，第二时钟相位与第一时钟相位相反。 电路包括将输入节点耦合到转移电容器的第一开关。 第一开关由驱动电容器控制。 电路还包括将输入节点耦合到驱动电容器的第二开关。 第二开关由转移电容器控制。 电路还包括将传输电容器耦合到输出节点的第三开关。 第三开关由驱动电容器控制。 第三开关与第一开关相反地工作。 电路最后包括耦合到输出节点的电荷存储电容器。
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公开(公告)号：US09098098B2
公开(公告)日：2015-08-04
申请号：US13722679
申请日：2012-12-20
Applicant: InvenSense, Inc.
Inventor： Derek Shaeffer , Nauman Afzal
Abstract: A curvature-corrected bandgap reference is disclosed. The curvature-corrected bandgap reference comprises a Brokaw bandgap circuit. The Brokaw bandgap circuit includes an output node providing a reference voltage. The Brokaw bandgap circuit further comprising a first BJT device including a first base terminal coupled to the output node and a first emitter terminal. The first BJT device operates at a first current density that is substantially proportional to absolute temperature. The curvature-corrected bandgap reference also includes a second BJT device including a second base terminal coupled to the output node and a second emitter terminal. The second BJT device operates at a second current density that is substantially independent of temperature. Finally the curvature-corrected bandgap reference includes a correction voltage proportional to a voltage difference of the first and second emitter terminals, wherein the correction voltage substantially cancels a curvature of the reference voltage.
Abstract translation: 公开了曲率校正的带隙基准。 经曲率校正的带隙基准包括Brokaw带隙电路。 Brokaw带隙电路包括提供参考电压的输出节点。 Brokaw带隙电路还包括第一BJT装置，其包括耦合到输出节点的第一基极端子和第一发射极端子。 第一BJT装置以基本上与绝对温度成比例的第一电流密度工作。 曲率校正的带隙基准还包括第二BJT装置，其包括耦合到输出节点的第二基极端子和第二发射极端子。 第二BJT器件以基本上与温度无关的第二电流密度工作。 最后，经曲率校正的带隙基准包括与第一和第二发射极端子的电压差成比例的校正电压，其中校正电压基本上抵消参考电压的曲率。
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Patent Agency Ranking
公开(公告)号：US10247555B2
公开(公告)日：2019-04-02
申请号：US15215759
申请日：2016-07-21
Applicant: InvenSense, Inc.
Inventor： Derek Shaeffer , Stanley Wang
IPC: G01C19/5776 , G01P1/04
Abstract: A round-robin sensing device is disclosed. The round-robin sensing device comprises a MEMS device, wherein the MEMS device includes first and second sense electrodes. The round-robin sensing device also comprises a multiplexer coupled to the first and second sense electrodes, at least one sense amplifier coupled to the multiplexer, a demodulator coupled to the at least one sense amplifier, and an integrate and dump circuit coupled to the demodulator. Finally, the round-robin sensing device comprises an analog-to-digital converter (ADC) coupled to the de-multiplexer, wherein the multiplexer, the at least one sense amplifier and the demodulator provide a continuous time sense path during amplification that is resettable and wherein the integrate and dump circuit and the ADC provide a discrete time processing path.
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公开(公告)号：US09880063B2
公开(公告)日：2018-01-30
申请号：US14195736
申请日：2014-03-03
Applicant: InvenSense, Inc.
Inventor： Derek Shaeffer , Stanley Wang
CPC classification number: G01L9/0072 , G01L9/12
Abstract: A pressure sensor is provided which produces a measurement of the displacement and a measurement of a natural frequency of the diaphragm which are then combined to produce a compensated measurement of the displacement of the diaphragm, thereby substantially eliminating the dependence of the compensated displacement measurement on strain.
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公开(公告)号：US20160178393A1
公开(公告)日：2016-06-23
申请号：US15058084
申请日：2016-03-01
Applicant: Invensense, Inc.
Inventor： Baris Cagdaser , Derek Shaeffer , Joseph Seeger
IPC: G01C25/00 , G01C19/5726
CPC classification number: G01C25/00 , G01C19/5726 , G01D5/24 , G01R27/2605
Abstract: A MEMS capacitive sensing interface includes a sense capacitor having a first terminal and a second terminal, and having associated therewith a first electrostatic force. Further included in the MEMS capacitive sensing interface is a feedback capacitor having a third terminal and a fourth terminal, the feedback capacitor having associated therewith a second electrostatic force. The second and the fourth terminals are coupled to a common mass, and a net electrostatic force includes the first and second electrostatic forces acting on the common mass. Further, a capacitance measurement circuit measures the sense capacitance and couples the first terminal and the third terminal. The capacitance measurement circuit, the sense capacitor, and the feedback capacitor define a feedback loop that substantially eliminates dependence of the net electrostatic force on a position of the common mass.
Abstract translation: MEMS电容感测接口包括具有第一端子和第二端子的感测电容器，并且具有与其相关联的第一静电力。 还包括在MEMS电容感测接口中的是具有第三端子和第四端子的反馈电容器，所述反馈电容器具有与其相关联的第二静电力。 第二和第四端子耦合到共同的质量，净静电力包括作用在公共质量上的第一和第二静电力。 此外，电容测量电路测量感测电容并耦合第一端子和第三端子。 电容测量电路，感测电容器和反馈电容器定义了基本上消除了净静电力对共同质量位置的依赖性的反馈回路。
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公开(公告)号：US10228249B2
公开(公告)日：2019-03-12
申请号：US15282227
申请日：2016-09-30
Applicant: InvenSense, Inc.
Inventor： Derek Shaeffer , Stanley Wang
IPC: G01C19/00 , G01P3/44 , G01P15/08 , G01C19/10 , G01C19/5776 , H03G3/20 , H03L7/089 , H03L7/093 , H03L7/099 , G01C19/06
Abstract: A gyroscope system comprises a MEMS gyroscope coupled to a drive system and a sense system. The drive system maintains the MEMS gyroscope in a state of oscillation and the sense system for receiving, amplifying, and demodulating an output signal of the MEMS gyroscope that is indicative of the rate of rotation. The gyroscope system further includes a phase-locked look (PLL) which receives a reference clock (REFCLK) from the drive system and produces a system clock (CLK). Finally, the gyroscope system includes a controller operating on the system clock sets an operating state of the drive system and the sense system and also controls a state of the PLL. One or more system state variables are maintained in a substantially fixed state during a protect mode thereby enabling rapid transitions between a low-power mode and a normal operating mode of the gyroscope system.
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公开(公告)号：US10001387B2
公开(公告)日：2018-06-19
申请号：US15058084
申请日：2016-03-01
Applicant: Invensense, Inc.
Inventor： Baris Cagdaser , Derek Shaeffer , Joseph Seeger
IPC: G01C25/00 , G01R27/26 , G01C19/5726 , G01D5/24
CPC classification number: G01C25/00 , G01C19/5726 , G01D5/24 , G01R27/2605
Abstract: A MEMS capacitive sensing interface includes a sense capacitor having a first terminal and a second terminal, and having associated therewith a first electrostatic force. Further included in the MEMS capacitive sensing interface is a feedback capacitor having a third terminal and a fourth terminal, the feedback capacitor having associated therewith a second electrostatic force. The second and the fourth terminals are coupled to a common mass, and a net electrostatic force includes the first and second electrostatic forces acting on the common mass. Further, a capacitance measurement circuit measures the sense capacitance and couples the first terminal and the third terminal. The capacitance measurement circuit, the sense capacitor, and the feedback capacitor define a feedback loop that substantially eliminates dependence of the net electrostatic force on a position of the common mass.
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