Photosensitive chip having transfer circuits which compensate for shielded test photosensors
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United States of America Patent
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May 27, 1997
Grant Date -
N/A
app pub date -
May 19, 1995
filing date -
May 19, 1995
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A photosensitive device includes a plurality of active photosensors, for receiving light from an original image, and at least one dark photosensor. The dark photosensor is shielded with a light shield so that it receives no light, and is used to establish a dark offset for the device. Each active photosensor and the dark photosensor have associated therewith an individual transfer circuit, including a reset node having a capacitance associated therewith. The capacitance of the reset node for the dark photosensor is selected to compensate for the extra capacitance created by the light shield.
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