ADAPTIVE LOW NOISE OFFSET SUBTRACTION FOR IMAGERS WITH LONG INTEGRATION TIMES
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United States of America Patent
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Issued Date -
May 20, 2010
app pub date -
Nov 14, 2008
filing date -
Nov 14, 2008
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An adaptive low noise offset subtraction pixel and method for adaptive low noise offset subtraction is disclosed. The pixel has a photosensitive element, a current offset memorization circuit and a current subtraction circuit. The current subtraction circuit coupled to the current offset memorization circuit, and comprises a transistor selected from a group consisting of a junction gate field-effect transistor, a bipolar transistor, a MOSFET transistor with a spiral channel, and a MOSFET transistor with a buried channel. The transistor configured to receive an offset current from the current offset memorization circuit and subtract the offset current from an output signal current received from the photosensitive element to provide an offset-free signal current and a shot noise limited subtraction current.
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