公开(公告)号：US11662205B2

公开(公告)日：2023-05-30

申请号：US17504994

申请日：2021-10-19

Applicant: STMicroelectronics, Inc.

Inventor： Deyou Fang ,  Chao-Ming Tsai ,  Milad Alwardi ,  Yamu Hu ,  David McClure

IPC: G01C19/5726 ,  G01C25/00 ,  G01C19/5733

CPC classification number: G01C19/5726 ,  G01C19/5733 ,  G01C25/005

Abstract: A microelectromechanical system (MEMS) gyroscope includes a driving mass and a driving circuit that operates to drive the driving mass in a mechanical oscillation at a resonant drive frequency. An oscillator generates a system clock that is independent of and asynchronous to the resonant drive frequency. A clock generator circuit outputs a first clock and a second clock that are derived from the system clock. The drive loop of the driving circuit including an analog-to-digital converter (ADC) circuit that is clocked by the first clock and a digital signal processing (DSP) circuit that is clocked by the second clock.

公开(公告)号：US09614542B2

公开(公告)日：2017-04-04

申请号：US14573083

申请日：2014-12-17

Applicant: STMICROELECTRONICS, INC.

Inventor： James L. Worley ,  Milad Alwardi

IPC: H03M1/78 ,  H03M1/68

CPC classification number: H03M1/68

Abstract: A DAC may include a decoder configured to receive a digital input signal, and first and second sub-DACs coupled in parallel to the decoder, each of the first and second sub-DACs having first and second LSB banks, and an MSB bank coupled between the first and second LSB banks. The decoder may be configured to selectively control the first and second LSB banks, and the MSB bank based upon the digital input signal. The DAC may include an output network coupled to the first and second sub-DACs and configured to generate an analog output signal related to the digital input signal.

公开(公告)号：US12111158B2

公开(公告)日：2024-10-08

申请号：US18136088

申请日：2023-04-18

Applicant: STMicroelectronics, Inc.

Inventor： Deyou Fang ,  Chao-Ming Tsai ,  Milad Alwardi ,  Yamu Hu ,  David McClure

IPC: G01C19/5726 ,  G01C19/5733 ,  G01C25/00

CPC classification number: G01C19/5726 ,  G01C19/5733 ,  G01C25/005

Abstract: A microelectromechanical system (MEMS) gyroscope includes a driving mass and a driving circuit that operates to drive the driving mass in a mechanical oscillation at a resonant drive frequency. An oscillator generates a system clock that is independent of and asynchronous to the resonant drive frequency. A clock generator circuit outputs a first clock and a second clock that are derived from the system clock. The drive loop of the driving circuit including an analog-to-digital converter (ADC) circuit that is clocked by the first clock and a digital signal processing (DSP) circuit that is clocked by the second clock.

公开(公告)号：US20170227569A1

公开(公告)日：2017-08-10

申请号：US15019453

申请日：2016-02-09

Applicant: STMicroelectronics, Inc.

Inventor： Milad Alwardi ,  Deyou Fang

IPC: G01P15/125 ,  G01P15/08

CPC classification number: G01P15/125 ,  G01C19/5776 ,  G01D5/2417 ,  G01R27/2605

Abstract: Disclosed herein is a device including a MEMS sensor configured to generate a first differential capacitance representing a change in capacitance from a first original sensing capacitance value and a second differential capacitance representing a change in capacitance from a second original sensing capacitance value, with the first and second original sensing capacitance values being mismatched. A compensation circuit is configured to generate outputs for compensating the first and second differential capacitances for the mismatch. A capacitance to voltage converter receives the first and second differential capacitances and the outputs of the compensation circuit as input and generates an output voltage as a function thereof.

公开(公告)号：US11175138B2

公开(公告)日：2021-11-16

申请号：US16452850

申请日：2019-06-26

Applicant: STMicroelectronics, Inc.

Inventor： Deyou Fang ,  Chao-Ming Tsai ,  Milad Alwardi ,  Yamu Hu ,  David McClure

IPC: G01C19/5726 ,  G01C25/00 ,  G01C19/5733

Abstract: A microelectromechanical system (MEMS) gyroscope includes a driving mass and a driving circuit that operates to drive the driving mass in a mechanical oscillation at a resonant drive frequency. An oscillator generates a system clock that is independent of and asynchronous to the resonant drive frequency. A clock generator circuit outputs a first clock and a second clock that are derived from the system clock. The drive loop of the driving circuit including an analog-to-digital converter (ADC) circuit that is clocked by the first clock and a digital signal processing (DSP) circuit that is clocked by the second clock.

公开(公告)号：US10274510B2

公开(公告)日：2019-04-30

申请号：US15019453

申请日：2016-02-09

Applicant: STMicroelectronics, Inc.

Inventor： Milad Alwardi ,  Deyou Fang

IPC: G01P15/125 ,  G01R27/26 ,  G01D5/241 ,  G01C19/5776

Abstract: Disclosed herein is a device including a MEMS sensor configured to generate a first differential capacitance representing a change in capacitance from a first original sensing capacitance value and a second differential capacitance representing a change in capacitance from a second original sensing capacitance value, with the first and second original sensing capacitance values being mismatched. A compensation circuit is configured to generate outputs for compensating the first and second differential capacitances for the mismatch. A capacitance to voltage converter receives the first and second differential capacitances and the outputs of the compensation circuit as input and generates an output voltage as a function thereof.