Image sensor
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United States of America Patent
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Jun 30, 2015
Grant Date -
Oct 3, 2013
app pub date -
Sep 25, 2012
filing date -
Apr 3, 2012
priority date (Note) -
In Force
status (Latency Note)
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Abstract
An image sensor includes, inter alia: a first and second capacitors arranged serially between an input terminal and a first node, a first comparing unit connecting to a first reference signal and a connecting node of the first and second capacitors, and an output terminal connecting to the first node wherein the first comparing unit provides first or second preliminary ramp signals on the first node, first and second switches arranged between the first comparing unit and the first capacitor to selectively connect the first capacitor to a ground voltage or the input terminal, a third capacitor connecting to the second capacitor in parallel, a third switch selectively connecting the first node to the third capacitor, a first ramp signal output unit generating a first ramp signal with the first preliminary ramp signal provided, and a second ramp signal output unit generating a second ramp signal using the second preliminary ramp signal.
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