公开(公告)号：US20170016723A1

公开(公告)日：2017-01-19

申请号：US15282227

申请日：2016-09-30

Applicant: InvenSense, Inc.

Inventor： Derek SHAEFFER ,  Stanley WANG

IPC: G01C19/10 ,  H03L7/093 ,  H03L7/089 ,  H03G3/20 ,  H03L7/099

CPC classification number: G01C19/10 ,  G01C19/065 ,  G01C19/5776 ,  H03G3/20 ,  H03L7/0891 ,  H03L7/093 ,  H03L7/099 ,  Y10T74/1229

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.

Abstract translation: 陀螺仪系统包括耦合到驱动系统和感测系统的MEMS陀螺仪。 驱动系统将MEMS陀螺仪维持在振荡状态，以及用于接收，放大和解调表示旋转速率的MEMS陀螺仪的输出信号的感测系统。 陀螺仪系统还包括从驱动系统接收参考时钟（REFCLK）并产生系统时钟（CLK）的锁相外观（PLL）。 最后，陀螺仪系统包括在系统时钟上操作的控制器设置驱动系统和感测系统的操作状态，并且还控制PLL的状态。 在保护模式期间，一个或多个系统状态变量保持在基本上固定的状态，从而实现陀螺仪系统的低功率模式和正常操作模式之间的快速转换。

公开(公告)号：US20160327393A1

公开(公告)日：2016-11-10

申请号：US15215759

申请日：2016-07-21

Applicant: InvenSense, Inc.

Inventor： Derek SHAEFFER ,  Stanley WANG

IPC: 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解复用器的模数转换器（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。

公开(公告)号：US20140260713A1

公开(公告)日：2014-09-18

申请号：US14088059

申请日：2013-11-22

Applicant: InvenSense, Inc.

Inventor： Derek SHAEFFER ,  Stanley WANG

IPC: G01C19/58

CPC classification number: G01C19/10 ,  G01C19/065 ,  G01C19/5776 ,  H03G3/20 ,  H03L7/0891 ,  H03L7/093 ,  H03L7/099 ,  Y10T74/1229

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.

Abstract translation: 陀螺仪系统包括耦合到驱动系统和感测系统的MEMS陀螺仪。 驱动系统将MEMS陀螺仪维持在振荡状态，以及用于接收，放大和解调表示旋转速率的MEMS陀螺仪的输出信号的感测系统。 陀螺仪系统还包括从驱动系统接收参考时钟（REFCLK）并产生系统时钟（CLK）的锁相外观（PLL）。 最后，陀螺仪系统包括在系统时钟上操作的控制器设置驱动系统和感测系统的操作状态，并且还控制PLL的状态。 在保护模式期间，一个或多个系统状态变量保持在基本上固定的状态，从而实现陀螺仪系统的低功率模式和正常操作模式之间的快速转换。

公开(公告)号：US20160134237A1

公开(公告)日：2016-05-12

申请号：US14538299

申请日：2014-11-11

Applicant: InvenSense, Inc.

Inventor： Stephen LLOYD ,  Derek SHAEFFER

IPC: H03B5/30

CPC classification number: H03B5/30

Abstract: In a first aspect, an oscillator is disclosed. The oscillator comprises a digital circuit; and at least one Microelectromechanical system (MEMS) resonator. The oscillator includes a non-volatile memory, the non-volatile memory (NVM) storing a frequency value related to a resonant frequency of the at least one MEMS resonator. The digital circuit utilizes the frequency value stored in the NVM to provide a measure of real time from the MEMS resonator. In a second aspect, a system is disclosed. The system includes a processor and at least one Microelectromechanical system (MEMS) resonator operating at first frequency. The system also includes a memory. The memory storing a frequency value related to a resonant frequency of the at least one MEMS resonator. The frequency value is measured by an outside source. The processor utilizes the frequency value stored in the memory to provide a measure of real time from the MEMS resonator.

Abstract translation: 在第一方面，公开了一种振荡器。 振荡器包括数字电路; 和至少一个微机电系统（MEMS）谐振器。 振荡器包括非易失性存储器，非易失性存储器（NVM）存储与至少一个MEMS谐振器的谐振频率相关的频率值。 数字电路利用存储在NVM中的频率值来提供来自MEMS谐振器的实时测量。 在第二方面，公开了一种系统。 该系统包括处理器和至少一个以第一频率工作的微机电系统（MEMS）谐振器。 该系统还包括一个内存。 所述存储器存储与所述至少一个MEMS谐振器的谐振频率相关的频率值。 频率值由外部源测量。 处理器利用存储在存储器中的频率值来提供来自MEMS谐振器的实时测量。

公开(公告)号：US20140266256A1

公开(公告)日：2014-09-18

申请号：US13952281

申请日：2013-07-26

Applicant: InvenSense, Inc.

Inventor： Baris CAGDASER ,  Du CHEN ,  Hasan AKYOL ,  Derek SHAEFFER

IPC: G01B7/14

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。

公开(公告)号：US20140260647A1

公开(公告)日：2014-09-18

申请号：US14195736

申请日：2014-03-03

Applicant: InvenSense, Inc.

Inventor： Derek SHAEFFER ,  Stanley WANG

IPC: G01L9/00

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.

Abstract translation: 提供了一种压力传感器，其产生位移的测量和振动膜的固有频率的测量，然后将振动膜的固有频率进行组合，以产生对振动膜的位移的补偿测量，从而基本上消除了补偿的位移测量对应变的依赖性 。

公开(公告)号：US20140260619A1

公开(公告)日：2014-09-18

申请号：US13958465

申请日：2013-08-02

Applicant: InvenSense, Inc.

Inventor： Derek SHAEFFER ,  Stanley WANG

IPC: G01P1/04

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。

公开(公告)号：US20140117966A1

公开(公告)日：2014-05-01

申请号：US13722679

申请日：2012-12-20

Applicant: INVENSENSE, INC.

Inventor： Derek SHAEFFER ,  Nauman AFZAL

IPC: G05F3/02

CPC classification number: G05F3/02 ,  G05F3/30

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。