Signal processing apparatus, signal processing method, image pickup element, and imaging apparatus
First Claim
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1. A signal processing apparatus, comprising:
- an A/D conversion unit configured to performA/D conversion of a first signal that is read out from unit pixels under a state in which reset signals of the unit pixels have been set to be high by a shutter operation of resetting floating diffusions of the unit pixels, the unit pixels being configured to perform photoelectric conversion of incident light under a state in which full depletion is prevented,A/D conversion of a second signal that is read out from the unit pixels under a state in which the reset signals of the unit pixels have been set to be low by the shutter operation,A/D conversion of a third signal that is read out from the unit pixels under a state in which the reset signals of the unit pixels have been set to be low by a read operation of reading out electric charge from the floating diffusions of the unit pixels, the electric charge being obtained through the photoelectric conversion, andA/D conversion of a fourth signal that is read out from the unit pixels under a state in which the reset signals of the unit pixels have been set to be high by the read operation; and
a correlated double sampling processing unit configured to generatea first output signal by performing correlated double sampling usinga first digital data item obtained through the A/D conversion of the first signal by the A/D conversion unit, anda second digital data item obtained through the A/D conversion of the second signal by the A/D conversion unit,a second output signal by performing correlated double sampling usinga third digital data item obtained through the A/D conversion of the third signal by the A/D conversion unit, anda fourth digital data item obtained through the A/D conversion of the fourth signal by the A/D conversion unit, anda third output signal by performing correlated double sampling usingthe first output signal, andthe second output signal.
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Abstract
Provided is a signal processing apparatus, including: an A/D conversion unit configured to perform A/D conversion of a first signal, A/D conversion of a second signal, A/D conversion of a third signal, and A/D conversion of a fourth signal; and a correlated double sampling processing unit configured to generate a first output signal by performing correlated double sampling using a first digital data item obtained through the A/D conversion of the first signal, and a second digital data item obtained through the A/D conversion of the second signal, a second output signal by performing correlated double sampling using a third digital data item obtained through the A/D conversion of the third signal, and a fourth digital data item obtained through the A/D conversion of the fourth signal, and a third output signal by performing correlated double sampling using the first output signal and the second output signal.
3 Citations
10 Claims
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1. A signal processing apparatus, comprising:
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an A/D conversion unit configured to perform A/D conversion of a first signal that is read out from unit pixels under a state in which reset signals of the unit pixels have been set to be high by a shutter operation of resetting floating diffusions of the unit pixels, the unit pixels being configured to perform photoelectric conversion of incident light under a state in which full depletion is prevented, A/D conversion of a second signal that is read out from the unit pixels under a state in which the reset signals of the unit pixels have been set to be low by the shutter operation, A/D conversion of a third signal that is read out from the unit pixels under a state in which the reset signals of the unit pixels have been set to be low by a read operation of reading out electric charge from the floating diffusions of the unit pixels, the electric charge being obtained through the photoelectric conversion, and A/D conversion of a fourth signal that is read out from the unit pixels under a state in which the reset signals of the unit pixels have been set to be high by the read operation; and a correlated double sampling processing unit configured to generate a first output signal by performing correlated double sampling using a first digital data item obtained through the A/D conversion of the first signal by the A/D conversion unit, and a second digital data item obtained through the A/D conversion of the second signal by the A/D conversion unit, a second output signal by performing correlated double sampling using a third digital data item obtained through the A/D conversion of the third signal by the A/D conversion unit, and a fourth digital data item obtained through the A/D conversion of the fourth signal by the A/D conversion unit, and a third output signal by performing correlated double sampling using the first output signal, and the second output signal. - View Dependent Claims (2, 3, 4)
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5. An image pickup element, comprising:
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unit pixels configured to perform photoelectric conversion of incident light under a state in which full depletion is prevented; an A/D conversion unit configured to perform A/D conversion of a first signal that is read out from the unit pixels under a state in which reset signals of the unit pixels have been set to be high by a shutter operation of resetting floating diffusions of the unit pixels, A/D conversion of a second signal that is read out from the unit pixels under a state in which the reset signals of the unit pixels have been set to be low by the shutter operation, A/D conversion of a third signal that is read out from the unit pixels under a state in which the reset signals of the unit pixels have been set to be low by a read operation of reading out electric charge from the floating diffusions of the unit pixels, the electric charge being obtained through the photoelectric conversion, and A/D conversion of a fourth signal that is read out from the unit pixels under a state in which the reset signals of the unit pixels have been set to be high by the read operation; and a correlated double sampling processing unit configured to generate a first output signal by performing correlated double sampling using a first digital data item obtained through the A/D conversion of the first signal by the A/D conversion unit, and a second digital data item obtained through the A/D conversion of the second signal by the A/D conversion unit, a second output signal by performing correlated double sampling using a third digital data item obtained through the A/D conversion of the third signal by the A/D conversion unit, and a fourth digital data item obtained through the A/D conversion of the fourth signal by the A/D conversion unit, and a third output signal by performing correlated double sampling using the first output signal, and the second output signal. - View Dependent Claims (6, 7, 8, 9)
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10. An imaging apparatus, comprising:
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an imaging unit configured to image a photographic subject; and an image processing unit configured to execute image processes on captured image data obtained by the imaging unit, the imaging unit including unit pixels configured to perform photoelectric conversion of incident light under a state in which full depletion is prevented, an A/D conversion unit configured to perform A/D conversion of a first signal that is read out from the unit pixels under a state in which reset signals of the unit pixels have been set to be high by a shutter operation of resetting floating diffusions of the unit pixels, A/D conversion of a second signal that is read out from the unit pixels under a state in which the reset signals of the unit pixels have been set to be low by the shutter operation, A/D conversion of a third signal that is read out from the unit pixels under a state in which the reset signals of the unit pixels have been set to be low by a read operation of reading out electric charge from the floating diffusions of the unit pixels, the electric charge being obtained through the photoelectric conversion, and A/D conversion of a fourth signal that is read out from the unit pixels under a state in which the reset signals of the unit pixels have been set to be high by the read operation, and a correlated double sampling processing unit configured to generate a first output signal by performing correlated double sampling using a first digital data item obtained through the A/D conversion of the first signal by the A/D conversion unit, and a second digital data item obtained through the A/D conversion of the second signal by the A/D conversion unit, a second output signal by performing correlated double sampling using a third digital data item obtained through the A/D conversion of the third signal by the A/D conversion unit, and a fourth digital data item obtained through the A/D conversion of the fourth signal by the A/D conversion unit, and a third output signal by performing correlated double sampling using the first output signal, and the second output signal.
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Specification
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Current AssigneeSony Semiconductor Solutions Corporation (Sony Group Corp.)
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Original AssigneeSony Corporation (Sony Group Corp.)
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InventorsIchikawa, Tatsuya, Shimamura, Nobutaka, Suzuki, Atsushi, Oike, Yusuke, Honda, Katsumi, Nakamura, Masahiro
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Primary Examiner(s)Monk, Mark T
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Assistant Examiner(s)MONK, MARK T
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Application NumberUS14/615,197Publication NumberTime in Patent Office628 DaysField of SearchNoneUS Class Current1/1CPC Class CodesH03M 3/342 by double sampling, e.g. co...H04N 25/616 involving a correlated samp...H04N 25/65 applied to reset noise, e.g...H04N 25/75 Circuitry for providing, mo...H04N 25/76 Addressed sensors, e.g. MOS...
