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    Image sensor power supply rejection ratio improvement through ramp generator in continuous time readout circuitry
    2.
    发明授权
    Image sensor power supply rejection ratio improvement through ramp generator in continuous time readout circuitry 有权
    通过连续时间读出电路中的斜坡发生器改善图像传感器电源抑制比

    公开(公告)号：US09571775B1

    公开(公告)日：2017-02-14

    申请号：US14942622

    申请日：2015-11-16

    Applicant: OMNIVISION TECHNOLOGIES, INC.

    Inventor： Liang Zuo ,  Zhihao Xu ,  Bi Yuan ,  Liping Deng ,  Yuxin Wang

    IPC: H04N5/335 ,  H04N3/14 ,  H04N5/378 ,  H04N5/369 ,  H04N5/376 ,  H04N5/225

    CPC classification number: H04N5/378 ,  H04N5/3698

    Abstract: A ramp generator for use in readout circuitry includes an integrator coupled to receive a ramp generator input reference signal to generate a reference ramp signal coupled to be received by an analog to digital converter. A power supply compensation circuit that is coupled to generate the ramp generator input reference signal includes a delay circuit including a variable resistor and a filter capacitor coupled to receive a power supply signal. The variable resistor is tuned to match a delay ripple from the power supply to a bitline output. A capacitive voltage divider is coupled to the delay circuit to generate the ramp generator input reference signal. The capacitive voltage divider includes a first variable capacitor coupled to a second variable capacitor that are tuned to provide a capacitance ratio that matches a coupling ratio from the power supply to the bitline output.

    Abstract translation: 用于读出电路的斜坡发生器包括一个积分器，该积分器被耦合以接收斜坡发生器输入参考信号，以产生耦合以由模数转换器接收的参考斜坡信号。 耦合以产生斜坡发生器输入参考信号的电源补偿电路包括延迟电路，该延迟电路包括耦合以接收电源信号的可变电阻器和滤波电容器。 调整可变电阻以匹配从电源到位线输出的延迟纹波。 电容分压器耦合到延迟电路以产生斜坡发生器输入参考信号。 电容分压器包括耦合到第二可变电容器的第一可变电容器，其被调谐以提供与从电源到位线输出的耦合比匹配的电容比。

    Image sensor with voltage supply grid clamping
    3.
    发明授权
    Image sensor with voltage supply grid clamping 有权

    公开(公告)号：US11218659B2

    公开(公告)日：2022-01-04

    申请号：US16708135

    申请日：2019-12-09

    Applicant: OMNIVISION TECHNOLOGIES, INC.

    Inventor： Chengcheng Xu ,  Rui Wang ,  Bi Yuan ,  Liang Zuo

    IPC: H04N5/378 ,  H04N5/3745 ,  H04N5/374 ,  H04N5/376 ,  H04N5/369 ,  H04N5/351

    Abstract: An image sensing device includes an image sensing circuit, a voltage supply grid, bitlines, and a control circuit. The image sensing circuit includes pixels arranged in rows and columns. Each one of the bitlines is coupled to a corresponding one of the columns. The voltage supply grid is coupled to the pixels. The control circuit is coupled to output at least a row select signal and a transfer signal to the rows. Each one of the rows is selectively coupled to the bitlines to selectively output image data signals in response to the row select signal and the transfer signal. Each one of the rows is further selectively coupled to the bitlines to selectively clamp the bitlines in response to the row select signal and the transfer signal. Each one of the rows is selectively decoupled from the bitlines in response to the row select signal.

    Image sensor power supply rejection ratio noise reduction through ramp generator
    4.
    发明授权
    Image sensor power supply rejection ratio noise reduction through ramp generator 有权
    图像传感器电源抑制比通过斜坡发生器降噪

    公开(公告)号：US09380208B1

    公开(公告)日：2016-06-28

    申请号：US14685151

    申请日：2015-04-13

    Applicant: OMNIVISION TECHNOLOGIES, INC.

    Inventor： Bi Yuan ,  Quifeng Jin ,  Liping Deng ,  Liang Zuo

    IPC: H04N5/232 ,  H04N5/357 ,  H04N5/378 ,  H04N5/374

    CPC classification number: H04N5/23241 ,  H04N5/357 ,  H04N5/3577 ,  H04N5/378

    Abstract: A ramp generator includes a supply voltage sampling circuit coupled to sample a black signal supply voltage during a black signal readout, and an image signal supply voltage of the pixel cell during an image signal readout of a pixel cell. A first integrator circuit receives a buffered reference voltage, and an output of the supply voltage sampling circuit. First and second switches are coupled between the first integrator circuit and a first capacitor to transfer a signal representative of a difference between the image signal supply voltage and the black signal supply voltage to the first capacitor. A second integrator circuit is coupled to the first capacitor to generate an output ramp signal coupled to be received by an analog to digital converter. A starting value of the output ramp signal is adjusted in response to the difference between the image signal and the black signal supply voltage.

    Abstract translation: 斜坡发生器包括在黑色信号读出期间耦合以对黑色信号电源电压进行采样的电源电压采样电路，以及在像素单元的图像信号读出期间像素单元的图像信号供应电压。 第一积分器电路接收缓冲的参考电压和电源电压采样电路的输出。 第一和第二开关耦合在第一积分器电路和第一电容器之间，以将表示图像信号电源电压和黑色信号电源电压之间的差异的信号传送到第一电容器。 第二积分器电路耦合到第一电容器以产生耦合以由模数转换器接收的输出斜坡信号。 响应于图像信号和黑色信号电源电压之间的差异来调整输出斜坡信号的起始值。

    IMAGE SENSOR PIXEL NOISE MEASUREMENT
    6.
    发明申请
    IMAGE SENSOR PIXEL NOISE MEASUREMENT 有权

    公开(公告)号：US20170359532A1

    公开(公告)日：2017-12-14

    申请号：US15179648

    申请日：2016-06-10

    Applicant: OMNIVISION TECHNOLOGIES, INC.

    Inventor： Bi Yuan ,  Liping Deng ,  Yingkan Lin ,  Liang Zuo ,  Yuxin Wang

    IPC: H04N5/357 ,  H04N5/378

    CPC classification number: H04N5/357 ,  H04N5/378

    Abstract: An image sensor pixel noise measurement circuit includes a pixel array on an integrated circuit chip. The pixel array includes a plurality of pixels including a first pixel to output a first image data signal, and a second pixel to output a second image data signal. A noise amplification circuit on the integrated circuit chip is coupled to receive the first and second image data signals from the pixel array. The noise amplification circuit is coupled to output an amplified differential noise signal in response to the first and second image data signals received from the pixel array. A fast Fourier transform (FFT) analysis circuit on the integrated circuit chip is coupled to transform the amplified differential noise signal output by the noise amplification circuit from a time domain to a frequency domain to analyze a pixel noise characteristic of the pixel array.

    HORIZONTAL BANDING REDUCTION WITH RAMP GENERATOR ISOLATION IN AN IMAGE SENSOR
    7.
    发明申请
    HORIZONTAL BANDING REDUCTION WITH RAMP GENERATOR ISOLATION IN AN IMAGE SENSOR 有权

    公开(公告)号：US20170289470A1

    公开(公告)日：2017-10-05

    申请号：US15087253

    申请日：2016-03-31

    Applicant: OMNIVISION TECHNOLOGIES, INC.

    Inventor： Liping Deng ,  Min Qu ,  Bi Yuan ,  Yingkan Lin

    IPC: H04N5/357 ,  H04N5/376 ,  H04N5/378

    CPC classification number: H04N5/357 ,  H04N5/3698 ,  H04N5/37455 ,  H04N5/37457 ,  H04N5/3765 ,  H04N5/378

    Abstract: A readout circuit for use in an image sensor includes a system ramp generator coupled to generate a system ramp signal. A plurality of analog-to-digital converters is coupled to a plurality of column bitlines from a pixel array to receive corresponding analog column image signals. An isolation ramp buffer is coupled between the system ramp generator and the analog-to-digital converters. The isolation ramp buffer includes a single input to receive the system ramp signal, and a plurality of isolated outputs. Each of the isolated outputs is coupled to provide an isolated column ramp signal to a corresponding analog-to-digital converter. Each of the of analog-to-digital converters is coupled to generate a corresponding digital column image signal in response to the corresponding analog column image signal and corresponding isolated column ramp signal.

    IMAGE SENSOR WITH VOLTAGE SUPPLY GRID CLAMPING
    8.
    发明申请
    IMAGE SENSOR WITH VOLTAGE SUPPLY GRID CLAMPING 有权

    公开(公告)号：US20220078365A1

    公开(公告)日：2022-03-10

    申请号：US17531465

    申请日：2021-11-19

    Applicant: OMNIVISION TECHNOLOGIES, INC.

    Inventor： Chengcheng Xu ,  Rui Wang ,  Bi Yuan ,  Liang Zuo

    IPC: H04N5/378 ,  H04N5/3745 ,  H04N5/374 ,  H04N5/376 ,  H04N5/369

    Abstract: An image sensing device includes an image sensing circuit, a voltage supply grid, bitlines, and a control circuit. The image sensing circuit includes pixels arranged in rows and columns. Each one of the bitlines is coupled to a corresponding one of the columns. The voltage supply grid is coupled to the pixels. The control circuit is coupled to output at least a row select signal and a transfer signal to the rows. Each one of the rows is selectively coupled to the bitlines to selectively output image data signals in response to the row select signal and the transfer signal. Each one of the rows is further selectively coupled to the bitlines to selectively clamp the bitlines in response to the row select signal and the transfer signal. Each one of the rows is selectively decoupled from the bitlines in response to the row select signal.

    IMAGE SENSOR WITH VOLTAGE SUPPLY GRID CLAMPING
    9.
    发明申请
    IMAGE SENSOR WITH VOLTAGE SUPPLY GRID CLAMPING 有权

    公开(公告)号：US20210176417A1

    公开(公告)日：2021-06-10

    申请号：US16708135

    申请日：2019-12-09

    Applicant: OMNIVISION TECHNOLOGIES, INC.

    Inventor： Chengcheng Xu ,  Rui Wang ,  Bi Yuan ,  Liang Zuo

    IPC: H04N5/378 ,  H04N5/3745

    Abstract: An image sensing device includes an image sensing circuit, a voltage supply grid, bitlines, and a control circuit. The image sensing circuit includes pixels arranged in rows and columns. Each one of the bitlines is coupled to a corresponding one of the columns. The voltage supply grid is coupled to the pixels. The control circuit is coupled to output at least a row select signal and a transfer signal to the rows. Each one of the rows is selectively coupled to the bitlines to selectively output image data signals in response to the row select signal and the transfer signal. Each one of the rows is further selectively coupled to the bitlines to selectively clamp the bitlines in response to the row select signal and the transfer signal. Each one of the rows is selectively decoupled from the bitlines in response to the row select signal.

    Image sensor pixel noise measurement
    10.
    发明授权
    Image sensor pixel noise measurement 有权

    公开(公告)号：US09961281B2

    公开(公告)日：2018-05-01

    申请号：US15179648

    申请日：2016-06-10

    Applicant: OMNIVISION TECHNOLOGIES, INC.

    Inventor： Bi Yuan ,  Liping Deng ,  Yingkan Lin ,  Liang Zuo ,  Yuxin Wang

    IPC: H04N5/357 ,  H04N5/378

    CPC classification number: H04N5/357 ,  H04N5/378

    Abstract: An image sensor pixel noise measurement circuit includes a pixel array on an integrated circuit chip. The pixel array includes a plurality of pixels including a first pixel to output a first image data signal, and a second pixel to output a second image data signal. A noise amplification circuit on the integrated circuit chip is coupled to receive the first and second image data signals from the pixel array. The noise amplification circuit is coupled to output an amplified differential noise signal in response to the first and second image data signals received from the pixel array. A fast Fourier transform (FFT) analysis circuit on the integrated circuit chip is coupled to transform the amplified differential noise signal output by the noise amplification circuit from a time domain to a frequency domain to analyze a pixel noise characteristic of the pixel array.

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