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.

公开(公告)号：US20170142356A1

公开(公告)日：2017-05-18

申请号：US14939868

申请日：2015-11-12

Applicant: OMNIVISION TECHNOLOGIES, INC.

Inventor： Liping Deng ,  Zhiqiang Song ,  Pengting Zhang ,  Yi Liu

IPC: H04N5/353 ,  H04N5/378

CPC classification number: H04N5/3532 ,  H04N5/353 ,  H04N5/3577 ,  H04N5/37452 ,  H04N5/378

Abstract: A pixel cell includes a photodiode to accumulate image charge. A global shutter transistor is coupled to the photodiode to reset the image charge in the photodiode in response to a global shutter control signal. A global shutter control signal generator circuit generates the global shutter control signal to have a first value signal or a second value signal. The first value signal is coupled to turn on the global shutter transistor to reset the photodiode. The second value signal controls the global shutter transistor to be in a low leakage off mode. A supply circuit is coupled to provide the second value signal to the global shutter control signal generator circuit. The supply circuit includes a variable filter circuit coupled to an output of the supply circuit to selectively vary a bandwidth of the second value signal in response to a bandwidth select signal.

公开(公告)号：US20150288902A1

公开(公告)日：2015-10-08

申请号：US14247855

申请日：2014-04-08

Applicant: OMNIVISION TECHNOLOGIES, INC.

Inventor： Tianjia Sun ,  Rui Wang ,  Liping Deng ,  Tiejun Dai

IPC: H04N5/369 ,  H04N5/357

CPC classification number: H04N5/3698 ,  H04N5/357 ,  H04N5/378

Abstract: An image sensor read out circuit includes a first current mirror circuit in which a second current conducted through a second current path is controlled in response to a first current conducted through the first current path. The second current is conducted through an amplifier transistor of a pixel circuit. A first current source coupled to the first current path to provide a substantially constant current component of the first current. A second current source coupled to a power supply rail of the pixel circuit and coupled to the first current path to provide a ripple current component of the first current. The ripple current component provided by the second current source is responsive to a ripple in the power supply rail. The first current is responsive to a sum of the currents from the first and second current sources.

Abstract translation: 图像传感器读出电路包括第一电流镜电路，其中响应于通过第一电流路径传导的第一电流来控制通过第二电流路径传导的第二电流。 第二电流通过像素电路的放大器晶体管导通。 耦合到第一电流路径以提供第一电流的基本上恒定的电流分量的第一电流源。 耦合到所述像素电路的电源轨并耦合到所述第一电流路径以提供所述第一电流的纹波电流分量的第二电流源。 由第二电流源提供的纹波电流分量响应于电源轨道中的纹波。 第一电流响应于来自第一和第二电流源的电流的总和。

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。