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    ADAPTIVE CORRELATED MULTIPLE SAMPLING
    1.
    发明申请
    ADAPTIVE CORRELATED MULTIPLE SAMPLING 有权

    公开(公告)号：US20240397236A1

    公开(公告)日：2024-11-28

    申请号：US18322408

    申请日：2023-05-23

    Applicant: OMNIVISION TECHNOLOGIES, INC.

    Inventor： Hiroaki Ebihara ,  Jiayu Guo ,  Liang Zuo ,  Lihang Fan

    IPC: H04N25/78 ,  H04N25/616

    Abstract: A readout circuit includes a comparator having a first input coupled to receive a ramp signal from a ramp generator and a second input coupled to receive an analog image data signal from one of a plurality of bitlines. The comparator is configured to generate a comparator output in response to a comparison of the ramp signal and the analog image data signal. A sampling circuit has a first input coupled to receive a sampling control signal and a second input coupled to receive the comparator output. The sampling circuit is configured to generate a sampling output. A counter has a first input coupled to receive a counter control signal and a second input coupled to receive one of the comparator output and a signal from the sampling circuit. The readout circuit is configured to perform correlated multiple sampling (CMS) calculations or non-CMS calculations in response to the sampling output.

    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.

    RAMP GENERATOR PROVIDING HIGH RESOLUTION FINE GAIN INCLUDING FRACTIONAL DIVIDER WITH DELTA-SIGMA MODULATOR
    4.
    发明申请
    RAMP GENERATOR PROVIDING HIGH RESOLUTION FINE GAIN INCLUDING FRACTIONAL DIVIDER WITH DELTA-SIGMA MODULATOR 有权

    公开(公告)号：US20210351768A1

    公开(公告)日：2021-11-11

    申请号：US16867399

    申请日：2020-05-05

    Applicant: OMNIVISION TECHNOLOGIES, INC.

    Inventor： Lihang Fan ,  Liang Zuo ,  Nijun Jiang ,  Min Qu ,  Xuelian Liu

    IPC: H03K4/06 ,  H03M3/00 ,  H03M1/56 ,  H04N5/378

    Abstract: A ramp generator providing ramp signal with high resolution fine gain includes a current mirror having a first and second paths to conduct a capacitor current and an integrator current responsive to the capacitor current. First and second switched capacitor circuits are coupled to the first path. A fractional divider circuit is coupled to receive a clock signal to generate in response to an adjustable fractional divider ratio K a switched capacitor control signal that oscillates between first and second states to control the first and second switched capacitor circuits. The first and second switched capacitor circuits are coupled to be alternatingly charged by the capacitor current and discharged in response to each the switched capacitor control signal. An integrator coupled is to the second path to generate the ramp signal in response to the integrator current.

    RAMP GENERATOR FOR LOW NOISE IMAGE SENSOR
    5.
    发明申请
    RAMP GENERATOR FOR LOW NOISE IMAGE SENSOR 有权
    低噪声图像传感器的RAMP发生器

    公开(公告)号：US20160309106A1

    公开(公告)日：2016-10-20

    申请号：US14688260

    申请日：2015-04-16

    Applicant: OMNIVISION TECHNOLOGIES, INC.

    Inventor： Liang Zuo ,  Zhiqiang Song ,  Liping Deng

    IPC: H04N5/378 ,  H04N5/357

    CPC classification number: H04N5/378 ,  H04N5/357 ,  H04N5/3745

    Abstract: A readout circuit for use in an image sensor includes a sense amplifier circuit coupled to a bitline to sense analog image data from a pixel cell of the image sensor. An analog to digital converter is coupled to the sense amplifier circuit to convert the analog image data to digital image data. A ramp generator circuit is coupled to generate a first ramp signal. The analog to digital converter is coupled to generate the digital image data in response to the analog image data and the first ramp signal. A first capacitive voltage divider is coupled to the ramp generator. The first capacitive voltage divider is coupled to reduce an output voltage swing of the first ramp signal coupled to be received by the analog to digital converter to reduce noise in the first ramp signal.

    Abstract translation: 用于图像传感器的读出电路包括耦合到位线的读出放大器电路，以检测来自图像传感器的像素单元的模拟图像数据。 模数转换器耦合到读出放大器电路，以将模拟图像数据转换为数字图像数据。 斜坡发生器电路被耦合以产生第一斜坡信号。 模拟数字转换器被耦合以响应于模拟图像数据和第一斜坡信号而生成数字图像数据。 第一电容分压器耦合到斜坡发生器。 第一电容性分压器被耦合以减少耦合以由模数转换器接收的第一斜坡信号的输出电压摆幅，以减少第一斜坡信号中的噪声。

    Image sensor power supply rejection ratio noise reduction through ramp generator
    6.
    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。

    Integrating ramp circuit with reduced ramp settling time
    9.
    发明授权
    Integrating ramp circuit with reduced ramp settling time 有权

    公开(公告)号：US10826470B2

    公开(公告)日：2020-11-03

    申请号：US16352673

    申请日：2019-03-13

    Applicant: OmniVision Technologies, Inc.

    Inventor： Liang Zuo ,  Rui Wang ,  Hiroaki Ebihara ,  Nijun Jiang

    IPC: H03K4/56 ,  H04N5/3745 ,  H03M1/56 ,  H04N5/378 ,  H04N5/369 ,  H03F3/45

    Abstract: A ramp generator includes an integrator including a first stage having first and second inputs and first and second outputs, and a second stage including first and second transistors coupled between a power supply rail and ground. A node between the first and second transistors is coupled to the output of the integrator amplifier. A control terminal of the first transistor is coupled to the first output of the first stage, and a control terminal of the second transistor is coupled to the second output of the first stage. A first current flows from the output to ground during a ramp event in the ramp signal generated from the output. Trimming circuitry is coupled to the output of the integrator amplifier to provide a second current to the output of the integrator amplifier in response to trimming inputs. The second current substantially matches the first current.

    IMAGE SENSOR PIXEL NOISE MEASUREMENT
    10.
    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.

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