公开(公告)号：US20240171188A1

公开(公告)日：2024-05-23

申请号：US18500886

申请日：2023-11-02

Applicant: INVENSENSE, INC.

Inventor： Wouter Bracke ,  Bert Serneels ,  Athanasios Sarafianos ,  Tim Piessens

IPC: H03M1/08 ,  G01D5/24 ,  G01R19/00 ,  G01R19/257

CPC classification number: H03M1/0827 ,  G01D5/24 ,  G01R19/0053 ,  G01R19/257 ,  G01R19/0023

Abstract: A continuous time single drive capacitance-to-voltage (C2V) converter can be employed for single sensor, balanced single sensor, or differential sensor. First sensor and/or second sensor can be employed to sense a condition. A capacitive bridge can comprise a first capacitive digital-to-analog-converter (DAC) and second capacitive DAC as a differential node. First capacitive DAC can be associated with first sensor, and second capacitive DAC can be associated with a third capacitive DAC, in series with first sensor, if single sensor is implemented or the second sensor if balanced single sensor or differential sensor is implemented. Capacitive bridge can be connected to differential input of a capacitive feedback amplifier that can be a continuous time amplifier with no signal sampling and no noise folding. Capacitive feedback amplifier can comprise capacitively coupled input common mode feedback, which can remove noise from a sensor drive, and output common mode feedback.