A charge-coupled device (CCD) is an analog
shift register, enabling analog signals (electric charges) to be transported through successive stages (capacitors) controlled by a
clock signal. Charge coupled devices can be used as a form of memory or for delaying analog, sampled signals. Today, they are most widely used for serializing parallel analog signals, namely in arrays of photoelectric light sensors. This use is so predominant that in common parlance, "CCD" is (erroneously) used as a synonym for a type of
image sensor even though, strictly speaking, "CCD" refers solely to the way that the image signal is read out from the chip.
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