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公开(公告)号：US10044948B2
公开(公告)日：2018-08-07
申请号：US14939868
申请日：2015-11-12
Applicant: OMNIVISION TECHNOLOGIES, INC.
Inventor： Liping Deng , Zhiqiang Song , Pengting Zhang , Yi Liu
IPC: H04N5/225 , H04N5/353 , H04N5/378 , H04N5/357 , H04N5/3745
Abstract: A pixel cell includes a photodiode to accumulate image charge. A global shutter transistor is coupled to the photodiode to reset the image charge in the photodiode in response to a global shutter control signal. A global shutter control signal generator circuit generates the global shutter control signal to have a first value signal or a second value signal. The first value signal is coupled to turn on the global shutter transistor to reset the photodiode. The second value signal controls the global shutter transistor to be in a low leakage off mode. A supply circuit is coupled to provide the second value signal to the global shutter control signal generator circuit. The supply circuit includes a variable filter circuit coupled to an output of the supply circuit to selectively vary a bandwidth of the second value signal in response to a bandwidth select signal.
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Patent Agency Ranking
公开(公告)号：US09838623B2
公开(公告)日：2017-12-05
申请号：US14939862
申请日：2015-11-12
Applicant: OMNIVISION TECHNOLOGIES, INC.
Inventor： Liping Deng , Zhiqiang Song , Pengting Zhang , Yi Liu
CPC classification number: H04N5/3532 , H04N5/353 , H04N5/37452 , H04N5/378
Abstract: A pixel cell includes a photodiode disposed in a semiconductor material to accumulate image charge in response to light. A global shutter transistor is disposed in the semiconductor material and is selectively resets the image charge in the photodiode in response to a global shutter control signal. A global shutter control signal generator circuit is coupled to generate the global shutter control signal to have a first value, a second value, and a third value. The first value of the global shutter control signal is coupled to turn on the global shutter transistor to reset the photodiode. The third value of the global shutter control signal is coupled to control the global shutter transistor to be in a low leakage off mode. The second value of the global shutter control signal is between the first and third values and is turns off the global shutter transistor.
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公开(公告)号：US20170142356A1
公开(公告)日：2017-05-18
申请号：US14939868
申请日：2015-11-12
Applicant: OMNIVISION TECHNOLOGIES, INC.
Inventor： Liping Deng , Zhiqiang Song , Pengting Zhang , Yi Liu
CPC classification number: H04N5/3532 , H04N5/353 , H04N5/3577 , H04N5/37452 , H04N5/378
Abstract: A pixel cell includes a photodiode to accumulate image charge. A global shutter transistor is coupled to the photodiode to reset the image charge in the photodiode in response to a global shutter control signal. A global shutter control signal generator circuit generates the global shutter control signal to have a first value signal or a second value signal. The first value signal is coupled to turn on the global shutter transistor to reset the photodiode. The second value signal controls the global shutter transistor to be in a low leakage off mode. A supply circuit is coupled to provide the second value signal to the global shutter control signal generator circuit. The supply circuit includes a variable filter circuit coupled to an output of the supply circuit to selectively vary a bandwidth of the second value signal in response to a bandwidth select signal.
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公开(公告)号：US11770634B1
公开(公告)日：2023-09-26
申请号：US17719602
申请日：2022-04-13
Applicant: OMNIVISION TECHNOLOGIES, INC.
Inventor： Zhenfu Tian , Hiroaki Ebihara , Tao Sun , Yi Liu , Shan Chen
Abstract: A ramp generator includes an operational amplifier having an output to generate a ramp signal. An integration current source is coupled to a first input and a reference voltage is coupled to a second input of the operational amplifier. A feedback capacitor is coupled between the first input and the output of the operational amplifier. A monitor circuit is coupled to the first and second inputs of the operational amplifier to generate an output flag in response to a comparison of the first and second inputs. A trimming control circuit is configured to generate a trimming signal in response to the output flag. An assist current source is configured to conduct an assist current from the output of the operational amplifier to ground in response the trimming signal generated by the trimming control circuit.
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公开(公告)号：US20170142355A1
公开(公告)日：2017-05-18
申请号：US14939862
申请日：2015-11-12
Applicant: OMNIVISION TECHNOLOGIES, INC.
Inventor： Liping Deng , Zhiqiang Song , Pengting Zhang , Yi Liu
CPC classification number: H04N5/3532 , H04N5/353 , H04N5/37452 , H04N5/378
Abstract: A pixel cell includes a photodiode disposed in a semiconductor material to accumulate image charge in response to light. A global shutter transistor is disposed in the semiconductor material and is selectively resets the image charge in the photodiode in response to a global shutter control signal. A global shutter control signal generator circuit is coupled to generate the global shutter control signal to have a first value, a second value, and a third value. The first value of the global shutter control signal is coupled to turn on the global shutter transistor to reset the photodiode. The third value of the global shutter control signal is coupled to control the global shutter transistor to be in a low leakage off mode. The second value of the global shutter control signal is between the first and third values and is turns off the global shutter transistor.
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公开(公告)号：US20230336889A1
公开(公告)日：2023-10-19
申请号：US17719602
申请日：2022-04-13
Applicant: OMNIVISION TECHNOLOGIES, INC.
Inventor： Zhenfu Tian , Hiroaki Ebihara , Tao Sun , Yi Liu , Shan Chen
CPC classification number: H04N5/378 , H03K4/08 , H04N5/3765
Abstract: A ramp generator includes an operational amplifier having an output to generate a ramp signal. An integration current source is coupled to a first input and a reference voltage is coupled to a second input of the operational amplifier. A feedback capacitor is coupled between the first input and the output of the operational amplifier. A monitor circuit is coupled to the first and second inputs of the operational amplifier to generate an output flag in response to a comparison of the first and second inputs. A trimming control circuit is configured to generate a trimming signal in response to the output flag. An assist current source is configured to conduct an assist current from the output of the operational amplifier to ground in response the trimming signal generated by the trimming control circuit.
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