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    Impedance characteristic circuit for electrochemical sensor
    2.
    发明授权
    Impedance characteristic circuit for electrochemical sensor 有权

    公开(公告)号：US10288674B2

    公开(公告)日：2019-05-14

    申请号：US15586869

    申请日：2017-05-04

    Applicant: Analog Devices Global

    Inventor： GuangYang Qu ,  Junbiao Ding ,  Tony Yincai Liu ,  Shurong Gu ,  Yimiao Zhao ,  Hanqing Wang ,  Leicheng Chen

    IPC: G01R31/28 ,  G01R15/16 ,  G01R27/02 ,  G01N27/417 ,  G01N27/416

    Abstract: A electrochemical or other sensor interface circuit architecture can deliver substantial DC offset bias to an electrochemical or other sensor separately or independently from delivering a time-varying AC excitation signal, which can then be provided with higher resolution, which, in turn, can allow better resolution of the measured response signal providing the impedance characteristic of sensor condition. For example, a differential time-varying AC excitation signal for the sensor condition characteristic can be delivered separately and independently from a differential stable (e.g., DC or other) bias signal, such as by using separate digital-to-analog converters (DACs), so that providing the more stable signal does not limit the resolution and accuracy of the time-varying signal, such as by using up the dynamic range of a single DAC.

    LOW POWER HALF-VDD GENERATION CIRCUIT WITH HIGH DRIVING CAPABILITY
    6.
    发明申请
    LOW POWER HALF-VDD GENERATION CIRCUIT WITH HIGH DRIVING CAPABILITY 审中-公开

    公开(公告)号：US20190317541A1

    公开(公告)日：2019-10-17

    申请号：US15951894

    申请日：2018-04-12

    Applicant: Analog Devices Global Unlimited Company

    Inventor： Hanqing Wang ,  Gerard Mora-Puchalt

    IPC: G05F3/16 ,  H03K17/687 ,  H03F3/45 ,  H03F3/00

    Abstract: A common mode reference circuit comprises a divider stage and an output stage. The divider stage includes a first n-channel field effect transistor and p-channel filed effect transistor (NFET/PFET) pair connected in series to a high supply voltage circuit node; and a second NFET/PFET pair connected in series to a low supply voltage circuit node. The output stage includes a first FET connected as a current mirror to a transistor of the first NFET/PFET pair; a second FET connected as a current mirror to a transistor of the second NFET/PFET pair; and a common mode reference output at a series connection from the first FET to the second FET.

    LOW POWER MEASUREMENT OF SKIN ELECTRICAL PROPERTIES
    7.
    发明申请
    LOW POWER MEASUREMENT OF SKIN ELECTRICAL PROPERTIES 审中-公开

    公开(公告)号：US20180353100A1

    公开(公告)日：2018-12-13

    申请号：US15616807

    申请日：2017-06-07

    Applicant: Analog Devices Global

    Inventor： Liam Riordan ,  José Carlos Conchell Añó ,  Tony Shi ,  Guangyang Qu ,  Hanqing Wang

    IPC: A61B5/053 ,  A61B5/00 ,  A61B5/16

    CPC classification number: A61B5/0531 ,  A61B5/01 ,  A61B5/0533 ,  A61B5/7225 ,  A61B5/7257 ,  A61B2560/0247

    Abstract: Various examples are directed to a measurement system for measuring an electrical property of skin comprising an excitation circuit, a receiver circuit, and a sequencer circuit. The excitation circuit may generate a periodic excitation signal that, when provided to the skin, generates a response signal in the skin indicative of the electrical property. The sequencer circuit may be configured to activate the excitation circuit to provide the excitation signal to the skin. While the excitation circuit is activated to provide the excitation signal to the skin, the sequencer circuit may activate the receiver circuit to execute a first sample cycle to generate a first plurality of samples of the response signal. A first value for the electrical property of the skin may be determined based at least in part on the first plurality of samples of the response signal.

    Fast settling capacitive gain amplifier circuit
    8.
    发明授权
    Fast settling capacitive gain amplifier circuit 有权

    公开(公告)号：US10044327B2

    公开(公告)日：2018-08-07

    申请号：US15600484

    申请日：2017-05-19

    Applicant: Analog Devices Global

    Inventor： Hanqing Wang ,  Gerard Mora-Puchalt

    IPC: H03F3/00 ,  H03F1/02 ,  H03F1/32 ,  H03F1/56 ,  H03F3/393 ,  H03F3/42 ,  H03F3/45 ,  H03F1/14 ,  H03F3/387 ,  H03M3/00

    Abstract: A capacitive gain amplifier circuit includes two sets of Miller capacitors and two output stage differential amplifier circuits. A first set of Miller capacitors is used to compensate the first output stage differential amplifier circuit during a first phase that resets the first output stage differential amplifier circuit. The second set of Miller capacitors is used to compensate the first output stage differential amplifier circuit during a second phase that chops a signal being amplified. The second set of Miller capacitors is swapped from one polarity to an opposite polarity of the first output stage differential amplifier circuit during successive second phases. The second output stage differential amplifier circuit includes a set of inputs selectively coupled with the inputs of the first output stage differential amplifier circuit and a set of outputs selectively coupled with the outputs of the first output stage differential amplifier circuit during the second phase.

    SENSOR BIAS CIRCUIT FOR IMPROVED NOISE PERFORMANCE
    10.
    发明申请
    SENSOR BIAS CIRCUIT FOR IMPROVED NOISE PERFORMANCE 审中-公开

    公开(公告)号：US20180323750A1

    公开(公告)日：2018-11-08

    申请号：US15586922

    申请日：2017-05-04

    Applicant: Analog Devices Global

    Inventor： Hanqing Wang ,  John Jude O'Donnell

    IPC: H03F1/26 ,  H03G3/20 ,  H03F3/45 ,  G01N27/416

    CPC classification number: H03F1/26 ,  G01N27/4163 ,  H03F3/45475 ,  H03F2200/555 ,  H03G3/20

    Abstract: Techniques for improving noise performance while processing signals received from an electrochemical sensor are provided. In an example, an interface circuit can include a first amplifier configured to provide a voltage to a counter electrode of an electrochemical sensor, a second amplifier configured to receive sensor information from a working electrode of the electrochemical sensor and to provide concentration information using the sensor information. In certain examples, an input of the first amplifier can be directly coupled to an input of the second amplifier to attenuate noise, of either the first amplifier or the second amplifier, within the concentration information provided by the second amplifier.

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