公开(公告)号：US20190257654A1

公开(公告)日：2019-08-22

申请号：US15900622

申请日：2018-02-20

Applicant: Analog Devices, Inc.

Inventor： Jiefeng Yan ,  William A. Clark

IPC: G01C19/5712 ,  G01C19/5776 ,  B81B7/00

Abstract: Sense amplifiers for use in connection with microelectromechanical system (MEMS) gyroscopes are described. The sense amplifiers may be configured to change the level of a gyroscope signal, i.e., the signal produced by a gyroscope in response to angular motion, to a level suitable for processing circuitry arranged to infer the angular velocity. The sense amplifier may further provide a DC discharge path allowing for discharge of the DC component of the output signal. The DC discharge path may include an anti-aliasing filter and a resistive circuit. The anti-aliasing filter may filter the output signal to maintain the resistive circuit in the linear region. The anti-aliasing filter may be designed with a frequency response such that discrete frequency sub-bands are blocked or at least attenuated. The frequency sub-bands may be tuned to substantially match the gyroscope's resonant frequency and its integer multiples.

公开(公告)号：US20160298963A1

公开(公告)日：2016-10-13

申请号：US15092943

申请日：2016-04-07

Applicant: Analog Devices, Inc.

Inventor： Ronald Alan Kapusta ,  Jiefeng Yan ,  James Lin

IPC: G01C19/56 ,  G01C25/00

CPC classification number: G01C19/5776

Abstract: Various embodiments provide methods of determining the quality factor of a resonating body in ways that are advantageous over previously known methods. For example, embodiments allow the determination of the quality factors of a resonating body without preventing the simultaneous use of the resonating body. For micromachined (“MEMS”) devices, embodiments allow the determination of the quality factors of a resonating body in a manner that is not dependent on transduction parameters of the MEMS device.

Abstract translation: 各种实施例提供了以相对于先前已知的方法有利的方式来确定谐振体的质量因子的方法。 例如，实施例允许确定谐振体的质量因子而不阻止共振体的同时使用。 对于微加工（“MEMS”）器件，实施例允许以不依赖于MEMS器件的转导参数的方式来确定谐振体的质量因子。

公开(公告)号：US10985698B2

公开(公告)日：2021-04-20

申请号：US16546094

申请日：2019-08-20

Applicant: Analog Devices, Inc.

Inventor： Jiefeng Yan

IPC: H03B5/30 ,  H03M1/40 ,  H03B5/06

Abstract: Differential electro-mechanical oscillating circuits are described. These circuits may be used in a variety of contexts to produce differential oscillating signals, such as sine waves or square waves. A switched capacitor circuit (SCC) is used to prevent low-frequency locking, whereby the output of the resonator would otherwise lock to a constant value. More specifically, the SCC provides an impedance in parallel to the resonator between the output terminals of oscillating circuit. The SCC is designed so that, at low frequencies, its impedance is lower than the impedance of the resonator. The presence of such an impedance prevents the formation of an open circuit between the output terminals, thus maintaining the oscillating circuit in the oscillation mode. The differential electro-mechanical oscillating circuits described herein may be used to produce clock signals or otherwise to produce periodic reference signals.

公开(公告)号：US11041722B2

公开(公告)日：2021-06-22

申请号：US16042742

申请日：2018-07-23

Applicant: Analog Devices, Inc.

Inventor： Jiefeng Yan ,  William A. Clark ,  Ronald A. Kapusta, Jr.

IPC: G01C19/5726 ,  G01C19/5755

Abstract: Systems and methods for sensing angular motion using a microelectromechanical system (MEMS) gyroscope are described. These systems and methods may be useful for sensing angular motion in the presence of low-frequency noise, which may be noise below 1 KHz. In a system for sensing angular motion, low-frequency noise may give rise to duty cycle jitter, which may affect the demodulation of the sense signal and cause errors in angular motion estimates. The systems and methods described herein address this problem by relying on double-edge phase detection technique that involves sensing when the rising and falling edges of the resonator signal deviate from their expected values in the idealized 50% duty cycle scenario. To prevent the formation of ripples in the double-edge phase detection that may otherwise affect the demodulation of the sense signal, a switch may be used. The switch may be maintained in a non-conductive state when a ripple is received.

公开(公告)号：US20210058032A1

公开(公告)日：2021-02-25

申请号：US16546094

申请日：2019-08-20

Applicant: Analog Devices, Inc.

Inventor： Jiefeng Yan

IPC: H03B5/30 ,  H03B5/06 ,  H03M1/40

Abstract: Differential electro-mechanical oscillating circuits are described. These circuits may be used in a variety of contexts to produce differential oscillating signals, such as sine waves or square waves. A switched capacitor circuit (SCC) is used to prevent low-frequency locking, whereby the output of the resonator would otherwise lock to a constant value. More specifically, the SCC provides an impedance in parallel to the resonator between the output terminals of oscillating circuit. The SCC is designed so that, at low frequencies, its impedance is lower than the impedance of the resonator. The presence of such an impedance prevents the formation of an open circuit between the output terminals, thus maintaining the oscillating circuit in the oscillation mode. The differential electro-mechanical oscillating circuits described herein may be used to produce clock signals or otherwise to produce periodic reference signals.

公开(公告)号：US10914583B2

公开(公告)日：2021-02-09

申请号：US15900622

申请日：2018-02-20

Applicant: Analog Devices, Inc.

Inventor： Jiefeng Yan ,  William A. Clark

IPC: G01C19/5712 ,  G01C19/5776 ,  B81B7/00

Abstract: Sense amplifiers for use in connection with microelectromechanical system (MEMS) gyroscopes are described. The sense amplifiers may be configured to change the level of a gyroscope signal, i.e., the signal produced by a gyroscope in response to angular motion, to a level suitable for processing circuitry arranged to infer the angular velocity. The sense amplifier may further provide a DC discharge path allowing for discharge of the DC component of the output signal. The DC discharge path may include an anti-aliasing filter and a resistive circuit. The anti-aliasing filter may filter the output signal to maintain the resistive circuit in the linear region. The anti-aliasing filter may be designed with a frequency response such that discrete frequency sub-bands are blocked or at least attenuated. The frequency sub-bands may be tuned to substantially match the gyroscope's resonant frequency and its integer multiples.

公开(公告)号：US10852136B2

公开(公告)日：2020-12-01

申请号：US15690504

申请日：2017-08-30

Applicant: Analog Devices, Inc.

Inventor： Jiefeng Yan ,  Ronald A. Kapusta, Jr. ,  Jianrong Chen

IPC: G01R23/14 ,  G01C19/5726 ,  G01C19/5755

Abstract: A method for detecting frequency mismatch in microelectromechanical systems (MEMS) gyroscopes is described. Detection of the frequency mismatch between a drive signal and a sense signal may be performed by generating an output signal whose spectrum reflects the physical characteristics of the gyroscope, and using the output signal to determine the frequency fC of the sense signal. The output signal may be generated by cross-correlating a random or pseudo-random noise signal with a response signal, where the response signal can be obtained by allowing the noise signal to pass through a system designed to have a noise transfer function that mimics the frequency response of the gyroscope. Since the noise signal is random or pseudo-random, cross-correlating the noise signal with the response signal reveals spectral characteristics of the gyroscope. To improve computational efficiency, the cross-correlation can be performed on demodulated versions of the noise signal and the response signal.

公开(公告)号：US20200025566A1

公开(公告)日：2020-01-23

申请号：US16042742

申请日：2018-07-23

Applicant: Analog Devices, Inc.

Inventor： Jiefeng Yan ,  William A. Clark ,  Ronald A. Kapusta, JR.

IPC: G01C19/5726

Abstract: Systems and methods for sensing angular motion using a microelectromechanical system (MEMS) gyroscope are described. These systems and methods may be useful for sensing angular motion in the presence of low-frequency noise, which may be noise below 1 KHz. In a system for sensing angular motion, low-frequency noise may give rise to duty cycle jitter, which may affect the demodulation of the sense signal and cause errors in angular motion estimates. The systems and methods described herein address this problem by relying on double-edge phase detection technique that involves sensing when the rising and falling edges of the resonator signal deviate from their expected values in the idealized 50% duty cycle scenario. To prevent the formation of ripples in the double-edge phase detection that may otherwise affect the demodulation of the sense signal, a switch may be used. The switch may be maintained in a non-conductive state when a ripple is received.

公开(公告)号：US10309782B2

公开(公告)日：2019-06-04

申请号：US15092943

申请日：2016-04-07

Applicant: Analog Devices, Inc.

Inventor： Ronald A. Kapusta ,  Jiefeng Yan ,  James Lin

IPC: G01C19/5776 ,  G01C19/56

Abstract: Various embodiments provide methods of determining the quality factor of a resonating body in ways that are advantageous over previously known methods. For example, embodiments allow the determination of the quality factors of a resonating body without preventing the simultaneous use of the resonating body. For micromachined (“MEMS”) devices, embodiments allow the determination of the quality factors of a resonating body in a manner that is not dependent on transduction parameters of the MEMS device.

公开(公告)号：US20190063923A1

公开(公告)日：2019-02-28

申请号：US15690504

申请日：2017-08-30

Applicant: Analog Devices, Inc.

Inventor： Jiefeng Yan ,  Ronald A. Kapusta, JR. ,  Jianrong Chen

IPC: G01C19/5726 ,  G01C19/5755

Abstract: A method for detecting frequency mismatch in microelectromechanical systems (MEMS) gyroscopes is described. Detection of the frequency mismatch between a drive signal and a sense signal may be performed by generating an output signal whose spectrum reflects the physical characteristics of the gyroscope, and using the output signal to determine the frequency fC of the sense signal. The output signal may be generated by cross-correlating a random or pseudo-random noise signal with a response signal, where the response signal can be obtained by allowing the noise signal to pass through a system designed to have a noise transfer function that mimics the frequency response of the gyroscope. Since the noise signal is random or pseudo-random, cross-correlating the noise signal with the response signal reveals spectral characteristics of the gyroscope. To improve computational efficiency, the cross-correlation can be performed on demodulated versions of the noise signal and the response signal.