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To understand those characteristics, there is a short explanation for each. Active area is a part of a sensor which contains the transistors, resistors and capacitors, and perform the actual detection and storage operations. Dark current is a small current which flows through the sensor because of the random generation of the disordered location of electrons and holes in the depletion region. Capacitance is an electrical characteristics which appears by applying an electrical charge to two conductive objects with a time period between them. Shunt resistance is a low-resistance connection between two points that forms an alternative path for a portion of the current.
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