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    • 4. 发明授权
    • CMOS image sensor with current mirror
    • 具有电流镜的CMOS图像传感器
    • US07750281B2
    • 2010-07-06
    • US12319862
    • 2009-01-13
    • Tetsuo AsabaJung-Chak Ahn
    • Tetsuo AsabaJung-Chak Ahn
    • H01L27/00H04N5/335
    • H01L27/14643H01L27/14609H01L27/14656H04N5/3745
    • An image sensor includes a pixel with a drive transistor and a select transistor. The drive transistor is driven according to a voltage at a floating diffusion node. The select transistor is coupled in series with the drive transistor for being turned on when the pixel is selected. The image sensor also includes a current mirror unit having first and second branches conducting mirrored currents. The first branch is coupled to the drive transistor, and the second branch is coupled to the select transistor at an output node of the pixel. With such biasing by the current mirror, gain drop in the drive transistor is minimized.
    • 图像传感器包括具有驱动晶体管和选择晶体管的像素。 驱动晶体管根据浮动扩散节点处的电压被驱动。 选择晶体管与驱动晶体管串联耦合,以在选择像素时导通。 图像传感器还包括具有导通镜像电流的第一和第二分支的电流镜单元。 第一分支耦合到驱动晶体管,并且第二分支耦合到像素的输出节点处的选择晶体管。 通过电流镜的这种偏置,驱动晶体管的增益下降最小化。