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关于CMOS图像传感器，下列说法正确的有（ ）。A.
它是用芯片工艺将光敏元件、放大器、 A/D 转换器、存储器、数字信号处理器和计算机接口电路集成在一块硅片上的图像传感器。
B.
CMOS 成像器件的像敏单元阵列实际上是光电二极管阵列，它没有线阵和面阵之分
C.
CMOS 成像器件的像敏单元有被动式像敏单元和主动式像敏单元两种结构类型
D.
早期的 CMOS 图像传感器采用被动像元结构，每个像敏单元由一个光敏元件和一个像址开关构成，无信号放大和处理电路，性能较差。
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