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。

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.

公开(公告)号：US20150109500A1

公开(公告)日：2015-04-23

申请号：US14057841

申请日：2013-10-18

Applicant: OMNIVISION TECHNOLOGIES, INC.

Inventor： Yuxin Wang ,  Liping Deng

IPC: H04N5/357

CPC classification number: H04N5/357 ,  H04N5/3765

Abstract: A method of reducing harmonic tones of noise in an image sensor includes generating a system clock and generating a random clock in response to the system clock. A charge pump is clocked with the random clock to generate a boosted voltage. The boosted voltage is provided to a pixel array of the image sensor. Image charge is readout from pixel cells of the pixel array using the boosted voltage from the charge pump.

Abstract translation: 降低图像传感器中噪声的谐波噪声的方法包括产生系统时钟并响应系统时钟产生随机时钟。 电荷泵由随机时钟计时以产生升压电压。 升压电压被提供给图像传感器的像素阵列。 使用来自电荷泵的升压电压从像素阵列的像素单元读出图像电荷。

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.