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    • 6. 发明授权
    • Correlated double sampling with up/down counter
    • 相关双重采样与上/下计数器
    • US5877715A
    • 1999-03-02
    • US873537
    • 1997-06-12
    • Sudhir Muniswamy GowdaHyun Jong ShinHon-Sum Philip WongPeter Hong XiaoJungwook Yang
    • Sudhir Muniswamy GowdaHyun Jong ShinHon-Sum Philip WongPeter Hong XiaoJungwook Yang
    • H03M1/12H03M1/56H04N5/363H04N5/374H04N5/378H04N1/40H03M1/46
    • H03M1/1295H03M1/1023H03M1/123H04N3/155H03M1/56
    • Disclosed is a circuit for performing correlated double sampling entirely in the digital domain. In an exemplary embodiment, the circuit includes a plurality of comparators, each having a first input coupled to an associated data line for receiving first and second signals in first and second sampling intervals, respectively. A time varying reference signal is applied to the second input of each comparator. A plurality of up/down counters are coupled to respective ones of the comparators, and each is operable to count in a first direction during the first sampling interval and in an opposite direction during the second sampling interval. Each up/down counter is caused to stop counting when the amplitude of the variable reference signal substantially equals the amplitude of the respective first or second signal. As a result, each up/down counter provides an output representing a subtraction of one of said first or second signals from the other. The invention has particular utility when used in conjunction with a CMOS image sensor.
    • 公开了一种完全在数字领域进行相关双重采样的电路。 在示例性实施例中,电路包括多个比较器,每个比较器具有耦合到相关联的数据线的第一输入,用于分别在第一和第二采样间隔中接收第一和第二信号。 时变参考信号被施加到每个比较器的第二输入端。 多个向上/向下计数器耦合到相应的比较器,并且每个可操作以在第一采样间隔期间以第一方向计数,并且在第二采样间隔期间以相反的方向计数。 当可变参考信号的幅度基本上等于相应的第一或第二信号的幅度时,使每个向上/向下计数器停止计数。 结果,每个向上/向下计数器提供表示从另一个减去所述第一或第二信号之一的输出。 当与CMOS图像传感器结合使用时,本发明具有特别的用途。
    • 8. 发明授权
    • Photodetector array
    • 光电检测器阵列
    • US5708263A
    • 1998-01-13
    • US600706
    • 1996-02-13
    • Hon-Sum Philip Wong
    • Hon-Sum Philip Wong
    • H01L27/146H04N5/335H04N5/357H04N5/374H01J40/14
    • H04N5/335H01L27/14609
    • A photodetector array for sensing radiant energy is described incorporating photodetectors, a respective semiconductor region for holding charge and two transistors coupled in series at each pixel, and a column load transistor. An amplifier at the load transistor may provide gain while providing dynamic range compression and a reduction in signal noise due to resetting of the voltage at the semiconductor regions. The invention overcomes the problem of CMOS manufacturing of photodetector arrays and for a simplified circuit per pixel to enable denser arrays and reduced noise.
    • 描述了用于感测辐射能的光电检测器阵列,其包括光电检测器,用于保持电荷的相应半导体区域和在每个像素处串联连接的两个晶体管和列负载晶体管。 负载晶体管处的放大器可以提供增益,同时提供动态范围压缩以及由于半导体区域处的电压复位而引起的信号噪声的降低。 本发明克服了光电探测器阵列的CMOS制造和每像素简化电路的问题,以使得更加密集的阵列和降低的噪声。