Correlated double sampling to include a controller to increment and invert a count during a first period and a second period
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United States of America Patent
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Mar 3, 2015
Grant Date -
Nov 8, 2012
app pub date -
Sep 7, 2011
filing date -
May 2, 2011
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Abstract
Apparatus and a method for correlated double sampling using an up-counter for parallel image sensors. All bits of a counter are set to one. An offset signal is compared to a first reference signal to define a first period during which the counter is incremented. After the first period, all bits of the counter are inverted. A sensor signal is compared to a second reference signal to define a second period during which the counter is incremented to generate a correlated double sampling value.
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