Image sensing pixels with feedback loops for imaging systems
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United States of America Patent
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Mar 5, 2013
Grant Date -
Jun 14, 2012
app pub date -
Dec 8, 2010
filing date -
Dec 8, 2010
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Abstract
An imaging system may include an image sensor array formed from imaging pixels with feedback loops. Each imaging pixel may include an amplifier transistor that is controlled by a voltage on a floating diffusion node and may include a feedback transistor connected between the floating diffusion node and column readout circuitry. The amplifier transistor, together with a current source in the image sensor array, may form a common-source amplifier that inversely amplifies the voltage on the floating diffusion node and provides control signals to the feedback transistor. The common-source amplifier and the feedback transistor may create a feedback loop during image readout operations and during image reset operations that clamps the voltage on the floating diffusion node.
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