公开(公告)号：US20220276290A1

公开(公告)日：2022-09-01

申请号：US17746577

申请日：2022-05-17

Applicant: Analog Devices, Inc.

Inventor： Isaac Chase NOVET ,  Steven J. DECKER

IPC: G01R27/26

Abstract: An impedance sensing circuit includes three impedance elements and a sensing element arranged in a bridge configuration. A first input terminal is coupled to two of the impedance elements to apply a stimulus signal. In a mutual-sensing mode, a second input terminal is coupled to the third impedance element and the sensing impedance element to apply an opposite phase stimulus signal. The impedance sensing circuit may be configured in a self-sensing mode, in which the opposite phase stimulus signal is decoupled from the third impedance element and the sensing impedance element. At least one of the impedance elements is variable and may be adjusted to balance an offset impedance load on the sensing element.

公开(公告)号：US20240319242A1

公开(公告)日：2024-09-26

申请号：US18672591

申请日：2024-05-23

Applicant: Analog Devices, Inc.

Inventor： Isaac Chase NOVET ,  Steven J. DECKER

IPC: G01R27/26

CPC classification number: G01R27/2629 ,  G01R27/2605

Abstract: An impedance sensing circuit includes three impedance elements and a sensing element arranged in a bridge configuration. A first input terminal is coupled to two of the impedance elements to apply a stimulus signal. In a mutual-sensing mode, a second input terminal is coupled to the third impedance element and the sensing impedance element to apply an opposite phase stimulus signal. The impedance sensing circuit may be configured in a self-sensing mode, in which the opposite phase stimulus signal is decoupled from the third impedance element and the sensing impedance element. At least one of the impedance elements is variable and may be adjusted to balance an offset impedance load on the sensing element.