Solid-state image sensor and image sensing system with readout unit including current source
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United States of America Patent
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Jan 23, 2018
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app pub date -
Mar 19, 2015
filing date -
Mar 27, 2014
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Abstract
A sensor has an image sensing unit including pixel blocks, and a readout unit for reading out a signal from the image sensing unit. The pixel block includes a photoelectric converter, first and second transistors, and a current source. First main electrodes of the first and second transistors are connected to a common node, and the current source is provided between the common node and a predetermined voltage. A signal readout operation includes an operation in which a voltage corresponding to charges in the photoelectric converter is supplied to a control electrode of the first transistor, and a temporally changing reference voltage is supplied to a control electrode of the second transistor. The readout unit reads out a signal from the image sensing unit via a second main electrode of the first transistor.
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