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    NOISE CANCELLATION CIRCUIT
    1.
    发明公开
    NOISE CANCELLATION CIRCUIT 审中-公开

    公开(公告)号：US20240364285A1

    公开(公告)日：2024-10-31

    申请号：US18139135

    申请日：2023-04-25

    Applicant: Apple Inc.

    Inventor： Tao SUN ,  Karthikeyan Reddy ,  Hyunsik Park

    IPC: H03F3/45 ,  G01R19/00 ,  G05F1/46 ,  H03F1/26

    CPC classification number: H03F3/45076 ,  G01R19/0053 ,  G05F1/46 ,  H03F1/26 ,  H03F2200/372 ,  H03F2203/45288

    Abstract: The present disclosure describes an apparatus, system, and method for cancelling noise (e.g., power supply noise). For example, the apparatus can include a load circuit, a sense resistor, and a current compensation circuit. The load circuit is configured to draw a first current (e.g., a load current). The sense resistor is configured to provide a voltage based on the first current. The current compensation circuit is configured to generate a second current (e.g., a compensation current) based on the voltage. A sum of the first current and the second current can be substantially constant.

    High speed, low power image sensor system
    2.
    发明授权
    High speed, low power image sensor system 有权

    公开(公告)号：US10951848B2

    公开(公告)日：2021-03-16

    申请号：US16272431

    申请日：2019-02-11

    Applicant: Apple Inc.

    Inventor： Hyunsik Park ,  Ali Mesgarani ,  Mansour Keramat ,  Dusan Stepanovic ,  Ashirwad Bahukhandi

    IPC: H04N3/14 ,  H04N5/335 ,  H04N5/378 ,  H04N5/369 ,  H04N5/365

    Abstract: An image sensing system is disclosed. The image sensing system includes an array of pixel circuits and a multiplexer configured to convey an output signal from a selected one of the pixel circuits. The output signal from the selected one of the plurality of pixel circuits is converted from analog to digital by a successive approximation register (SAR) analog-to-digital converter (ADC). A control circuit is provided to cause the SAR ADC power cycling with shaped power control signal. The SAR ADC comparator pre-amp with integrate-reset causes reduced power to the theoretical limit for imaging systems. The control circuit causes quantization process of selected ones of the pixel circuits to be repeated one or more times during the processing.

    Low noise image sensor system with reduced fixed pattern noise
    4.
    发明授权
    Low noise image sensor system with reduced fixed pattern noise 有权

    公开(公告)号：US11032501B2

    公开(公告)日：2021-06-08

    申请号：US16272228

    申请日：2019-02-11

    Applicant: Apple Inc.

    Inventor： Dusan Stepanovic ,  Sedigheh Hashemi ,  Mansour Keramat ,  Hyunsik Park

    IPC: H04N5/365 ,  H04N5/357 ,  H04N5/3745 ,  H04N5/378 ,  H03M1/06 ,  H03M1/46 ,  H03M1/40

    Abstract: An image sensing system and methods for operating the same are disclosed. An image sensing system includes a plurality of pixel circuits, a multiplexer configured to select one of the pixel circuit and provide analog pixel data without sampling, and a successive approximation register (SAR) analog-to-digital converter (ADC) configured to convert the analog pixel data into digital data. The SAR ADC includes a capacitive digital-to-analog converter (CDAC) configured to convert contents of the SAR into a corresponding analog signal for comparison, by a comparator, with the analog pixel data. The CDAC includes a two-dimensional array of circuit elements. A control circuit in the image sensing system is configured to cause random ones of the circuit elements of the CDAC to be selected for generation of the corresponding analog signal and add a dithering signal so a CDAC output and shuffle a multiplexer switch sequence to improve fixed pattern noise.

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