DIFFERENTIAL PMOS ISFET-BASED PH SENSOR
    5.
    发明公开

    公开(公告)号:US20240310321A1

    公开(公告)日:2024-09-19

    申请号:US18575877

    申请日:2022-07-01

    IPC分类号: G01N27/414 G01N27/416

    CPC分类号: G01N27/4148 G01N27/4167

    摘要: A pHI sensor system, Integrated Circuit (IC) chip, and a method are provided. Embodiments of the pH sensor may a first p-channel ion-sensitive transistor (IST)-operational-transconductance-amplifier (PIOTA) and a second PIOTA. Each PIOTA may further include a p-channel IST, an n-channel load transistor having a source and drain, wherein each PIOTA may have a drain-to-source resistance different from each other. Each PIOTA may further include an operational-transconductance-amplifier (OTA). A differential sensor may be connected to the outputs of both PIOTAs, and an output from the differential sensor may indicate a change in pH. Each PIOTA may further have an n-type substrate, a potential of which may be varied to control sensitivity of pH change detection. The NMOS load transistors of one or both of the PIOTAs may be selected from a plurality of NMOS load transistors to enhance sensitivity.

    System and method for tracking human behavior real-time with single magnetometer sensor and magnets

    公开(公告)号:US12060002B2

    公开(公告)日:2024-08-13

    申请号:US17605068

    申请日:2020-04-24

    发明人: Shan Lin

    IPC分类号: B60Q9/00 G01R33/02

    CPC分类号: B60Q9/00 G01R33/02

    摘要: A system and method for monitoring and analyzing activities of a person operating a machine, particularly driving a vehicle, is provided. A first magnet is attached to a hand of the person and a second magnet is attached to the head of the person. A smart watch having a magnetometer is attached to the other hand of the person. The magnetometer is in magnetic communication with both the first magnet and the second magnet to generate a first magnetic signal and a second magnetic signal. Both signals can be received by a processor and applied to mathematical models by the processor to generate indicators representative of positions and motions of the hands and the head. An alarm can be generated based on the indicators.