Image sensor with switchable biasing arrangement
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United States of America Patent
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Aug 22, 2017
Issued Date -
N/A
app pub date -
Jan 26, 2015
filing date -
Jan 24, 2014
priority date (Note) -
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Abstract
In an image sensor, a photo detector circuit applies a photo current to a capacitive node during a photo detection time interval. A front-end circuit comprises an input transistor having a control node that is coupled to the capacitive node. A switchable biasing arrangement puts the input transistor in a disabled state during the photo detection time interval. The input transistor is put in an enabled state after the photo detection time interval. This then causes the front-end circuit to provide an output signal that is representative of a voltage on the capacitive node after the photo detection time interval.
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