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    • 55. 发明授权
    • Solid-state image sensor with focal-plane digital photon-counting pixel
array
    • 具有焦平面数字光子计数像素阵列的固态图像传感器
    • US5665959A
    • 1997-09-09
    • US673014
    • 1996-07-01
    • Eric R. FossumBedabrata Pain
    • Eric R. FossumBedabrata Pain
    • H01L27/146H01J40/14
    • H01L27/14658H01L27/14609H01L27/14634
    • A solid-state focal-plane imaging system comprises an N.times.N array of high gain, low-noise unit cells, each unit cell being connected to a different one of photovoltaic detector diodes, one for each unit cell, interspersed in the array for ultralow level image detection and a plurality of digital counters coupled to the outputs of the unit cell by a multiplexer (either a separate counter for each unit cell or a row of N of counters time shared with N rows of digital counters). Each unit cell includes two self-biasing cascode amplifiers in cascade for a high charge-to-voltage conversion gain (>1 mV/e.sup.-) and an electronic switch to reset input capacitance to a reference potential in order to be able to discriminate detection of an incident photon by the photoelectron (e.sup.-) generated in the detector diode at the input of the first cascode amplifier in order to count incident photons individually in a digital counter connected to the output of the second cascode amplifier. Reseting the input capacitance and initiating self-biasing of the amplifiers occurs every clock cycle of an integratng period to enable ultralow light level image detection by the array of photovoltaic detector diodes under such ultralow light level conditions that the photon flux will statistically provide only a single photon at a time incident on any one detector diode during any clock cycle.
    • 固态焦平面成像系统包括高增益低噪声单元的NxN阵列,每个单元电池连接到不同的一个光伏检测器二极管,每个单元电池一个,散布在阵列中用于超低电平 图像检测和多个数字计数器,其通过多路复用器(每个单位单元的单独计数器或与N行数字计数器共享的计数器时间的N行)耦合到单元单元的输出。 每个单元单元包括两个级联级联的自偏压共源共栅放大器,用于高电荷到电压转换增益(> 1 mV / e-)和电子开关,以将输入电容复位为参考电位,以便能够区分检测 通过在第一共源共栅放大器的输入端处的检测器二极管中产生的光电子(e-)来入射光子,以便在与第二共源共栅放大器的输出连接的数字计数器中单独计数入射光子。 放大输入电容和启动放大器的自偏置在整个周期的每个时钟周期发生,以便在这样的超低光级条件下通过光电探测器二极管阵列实现超低光级图像检测,光子通量将统计上仅提供一个 光子在任何时钟周期内一次入射到任何一个检测器二极管上。