Comparator, AD converter, solid-state imaging device, and camera system
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United States of America Patent
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Jul 1, 2014
Grant Date -
Apr 25, 2013
app pub date -
Oct 16, 2012
filing date -
Oct 21, 2011
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Disclosed herein is a comparator including: a first input sampling capacitance; a second input sampling capacitance; an output node; a transconductance (Gm) amplifier as a differential comparator section configured to receive a slope signal, a signal level of the slope signal changing with a slope, at one input terminal of the Gm amplifier via the first input sampling capacitance, and receive an input signal at another input terminal of the Gm amplifier via the second input sampling capacitance, and subject the slope signal and the input signal to comparing operation; and an isolator configured to hold a voltage of an output section of the Gm amplifier constant, the isolator being disposed between the output section of the Gm amplifier and the output node.
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