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    • 5. 发明申请
    • PHOTOELECTRIC CONVERSION CIRCUIT AND SOLID-STATE IMAGE-SENSING DEVICE USING IT
    • 光电转换电路和使用它的固态图像感测装置
    • US20080007640A1
    • 2008-01-10
    • US11774115
    • 2007-07-06
    • Takaaki FuchikamiMasato Moriwake
    • Takaaki FuchikamiMasato Moriwake
    • H04N5/335
    • H04N5/37452H04N5/357H04N5/374H04N5/3745
    • A photoelectric conversion circuit has: a photoelectric conversion element that produces a detection current commensurate with the amount of light received thereby; a capacitor having one end connected to one end of the photoelectric conversion element, the one end of the capacitor from which a terminal voltage commensurate with the integral of the detection current is drawn; and an amplifier that receives the terminal voltage of the capacitor and produces an amplified signal commensurate with the terminal voltage thus received. The photoelectric conversion circuit outputs a final optical signal (an output current) by using the amplified signal of the amplifier. As a current path that can serve as a charging/discharging path of the capacitor, the photoelectric conversion circuit includes only a current path along which the photoelectric conversion element is located. With this configuration, it is possible to enhance responsivity to light and improve the S/N ratio of a received optical signal by making the most of electric power obtained from a photoelectric conversion element.
    • 光电转换电路具有:光电转换元件,其产生与由此接收的光量相当的检测电流; 一个电容器,其一端连接到光电转换元件的一端,电容器的一端被绘制成与检测电流的积分相匹配的端电压; 以及放大器,其接收电容器的端子电压并产生与这样接收的端子电压相当的放大信号。 光电转换电路通过使用放大器的放大信号输出最终的光信号(输出电流)。 作为可以用作电容器的充电/放电路径的电流路径,光电转换电路仅包括光电转换元件所位于的电流路径。 利用这种配置,可以通过从光电转换元件获得的最大功率来提高对光的响应性并提高接收的光信号的S / N比。