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发明授权
CN108377348B 像素电路及图像感测系统 有权

像素电路及图像感测系统
摘要：
本申请案涉及一种像素电路及一种图像感测系统。一种像素电路包含光电二极管及耦合到所述光电二极管的转移晶体管。浮动扩散部耦合到所述转移晶体管，所述转移晶体管经耦合以将图像电荷从所述光电二极管转移到所述浮动扩散部。放大器电路包含：输入，其耦合到所述浮动扩散部；输出，其经耦合以产生所述像素电路的图像数据信号；及可变偏置端子，其经耦合以接收可变偏置信号。复位开关耦合于所述放大器电路的所述输出与所述输入之间以响应于复位信号而将所述放大器电路复位。可变偏置产生器电路经耦合以响应于复位信号而产生所述可变偏置信号，以响应于所述复位信号从作用状态到非作用状态的转变而将所述可变偏置信号从第一偏置信号值转变到第二偏置信号值。
摘要（英）：

A pixel circuit includes a photodiode, and a transfer transistor coupled to the photodiode. A floating diffusion is coupled to the transfer transistor coupled to transfer image charge from the photodiode to the floating diffusion. An amplifier circuit includes an input coupled to the floating diffusion, an output coupled to generate an image data signal of the pixel circuit, and a variable bias terminal coupled to receive a variable bias signal. A reset switch is coupled between the output and input of the amplifier circuit to reset the amplifier circuit in response to a reset signal. A variable bias generator circuit is coupled to generate the variable bias signal in response to a reset signal to transition the variable bias signal from a first bias signal value to a second bias signal value in response to a transition of the reset signal from an active state to an inactive state.

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