IMAGE CAPTURING APPARATUS HAVING COMPARATOR CIRCUIT TO COMPARE CURRENT WITH REFERENCE CURRENT
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United States of America Patent
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Jul 21, 2017
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Jul 29, 2016
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Abstract
A plurality of pixels includes a photoelectric conversion unit and the first transistor. A signal line is connected to the plurality of pixels. A second transistor includes a source or a drain electrically connected to the first transistor and includes a gate supplied with a signal corresponding to a reference signal of which a potential changes at a predetermined gradient with time. A first current source is configured to supply a current to the first and second transistors. A control unit is configured to control a voltage between a gate and a source of a third transistor to be a voltage corresponding to a voltage between the gate and the source of the second transistor. A comparator circuit is configured to compare a first current flowing through the third transistor with a reference current.
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