A Charge Coupled Device (CCD) is a light sensitive device that uses an electrical charge to represent a digital value. CCDs are mainly used in Digital Imaging in which each pixel of an image is converted to an electrical charge.
A CCD can be thought of as a subset of Charge Transfer Devices. These are based upon Metal Oxide Semiconductor (MOS) capacitors. Two types, viz surface channel and buried channel MOS capacitors have been used in CCD, but primarily buried channel capacitors have been used for manufacturing since these do not have problems caused by surface irregularities at oxide-semiconductor interface.
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