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发明授权
CN105681696B 像素单元、图像传感器及提升像素单元中复位电平的方法 有权

像素单元、图像传感器及提升像素单元中复位电平的方法
摘要：
本申请案涉及像素单元、图像传感器及用于提升像素单元中的复位电平的方法。在复位操作期间通过将像素单元的复位晶体管切换为ON以将浮动扩散件充电到第一复位电平来提升像素单元中的复位电平。在所述浮动扩散件复位操作期间将选择晶体管从OFF切换到ON以使放大器晶体管的输出终端放电。在已响应于将所述选择晶体管切换为ON而使所述放大器晶体管的所述输出终端放电之后将所述复位晶体管切换到OFF。在经放电之后所述放大器晶体管的输出终端充电到静态电平。耦合到所述放大器晶体管的输入终端的所述浮动扩散件跟随所述放大器晶体管的输出终端跨越耦合于所述放大器晶体管的所述输入终端与所述输出终端之间的放大器电容以提升所述浮动扩散件的复位电平。
摘要（英）：

A reset level in a pixel cell is boosted by switching ON a reset transistor of the pixel cell to charge the floating diffusion to a first reset level during a reset operation. A select transistor is switched from OFF to ON during the floating diffusion reset operation to discharge an output terminal of an amplifier transistor. The reset transistor is switched OFF after the output terminal of the amplifier transistor has been discharged in response to the switching ON of the select transistor. The output terminal of the amplifier transistor charges to a static level after being discharged. The floating diffusion coupled to the input terminal of the amplifier transistor follows the output terminal of the amplifier transistor across an amplifier capacitance coupled between the input terminal and the output terminal of the amplifier transistor to boost the reset level of the floating diffusion.

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