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1. 发明授权

US10051225B2 Current injection for fast ramp start-up during analog-to-digital operations 有权
公开(公告)号：US10051225B2
公开(公告)日：2018-08-14
申请号：US15376352
申请日：2016-12-12
申请人： OMNIVISION TECHNOLOGIES, INC.
发明人： Fan Zhu , Yu-Shen Yang , Yingkan Lin , Zejian Wang , Liping Deng
IPC分类号： H04N5/378 , H03M1/34 , H03M1/66 , H03K4/90
CPC分类号： H04N5/378 , H03K4/90 , H03M1/34 , H03M1/56 , H03M1/66
摘要： An example method for fast ramp start-up during analog to digital conversion (ADC) includes opening a feedback bypass switch coupled to an amplifier to initiate an ADC operation, providing an injection current pulse to an inverting input of the amplifier, where the non-inverting input is coupled to a feedback bypass switch, integrating a first reference current coupled to the inverting input of the amplifier, where the integrating of the first reference current occurs due to the opening of the feedback bypass switch, and providing a reference voltage in response to the injection current pulse, the integrating of the first reference current, and a reference voltage coupled to a non-inverting input of the amplifier, where a level of the reference voltage is increased at least at initiation of the ADC operation in response to the injection current pulse.

2. 发明授权

US09961292B1 Imaging sensor with amplifier having variable bias and increased output signal range 有权
公开(公告)号：US09961292B1
公开(公告)日：2018-05-01
申请号：US15420531
申请日：2017-01-31
申请人： OMNIVISION TECHNOLOGIES, INC.
发明人： Liping Deng , Zheng Yang , Chun-Ming Tang , Tiejun Dai
IPC分类号： H04N5/378 , H03F3/08
CPC分类号： H03F3/082 , H03F1/0261 , H03F1/223 , H04N5/355 , H04N5/3745
摘要： A pixel circuit includes a photodiode, and a transfer transistor coupled to the photodiode. A floating diffusion is coupled to the transfer transistor coupled to transfer image charge from the photodiode to the floating diffusion. An amplifier circuit includes an input coupled to the floating diffusion, an output coupled to generate an image data signal of the pixel circuit, and a variable bias terminal coupled to receive a variable bias signal. A reset switch is coupled between the output and input of the amplifier circuit to reset the amplifier circuit in response to a reset signal. A variable bias generator circuit is coupled to generate the variable bias signal in response to a reset signal to transition the variable bias signal from a first bias signal value to a second bias signal value in response to a transition of the reset signal from an active state to an inactive state.

3. 发明授权

US09961281B2 Image sensor pixel noise measurement 有权
公开(公告)号：US09961281B2
公开(公告)日：2018-05-01
申请号：US15179648
申请日：2016-06-10
申请人： OMNIVISION TECHNOLOGIES, INC.
发明人： Bi Yuan , Liping Deng , Yingkan Lin , Liang Zuo , Yuxin Wang
IPC分类号： H04N5/357 , H04N5/378
CPC分类号： H04N5/357 , H04N5/378
摘要： An image sensor pixel noise measurement circuit includes a pixel array on an integrated circuit chip. The pixel array includes a plurality of pixels including a first pixel to output a first image data signal, and a second pixel to output a second image data signal. A noise amplification circuit on the integrated circuit chip is coupled to receive the first and second image data signals from the pixel array. The noise amplification circuit is coupled to output an amplified differential noise signal in response to the first and second image data signals received from the pixel array. A fast Fourier transform (FFT) analysis circuit on the integrated circuit chip is coupled to transform the amplified differential noise signal output by the noise amplification circuit from a time domain to a frequency domain to analyze a pixel noise characteristic of the pixel array.

4. 发明授权

US10187602B2 Current injection for fast ramp start-up during analog-to-digital operations 有权
公开(公告)号：US10187602B2
公开(公告)日：2019-01-22
申请号：US16034226
申请日：2018-07-12
申请人： OmniVision Technologies, Inc.
发明人： Fan Zhu , Yu-Shen Yang , Yingkan Lin , Zejian Wang , Liping Deng
IPC分类号： H04N5/378 , H03M1/34 , H03K4/90 , H03M1/56
摘要： An example method for fast ramp start-up during analog to digital conversion (ADC) includes opening a feedback bypass switch coupled to an amplifier to initiate an ADC operation, providing an injection current pulse to an inverting input of the amplifier, where the non-inverting input is coupled to a feedback bypass switch, integrating a first reference current coupled to the inverting input of the amplifier, where the integrating of the first reference current occurs due to the opening of the feedback bypass switch, and providing a reference voltage in response to the injection current pulse, the integrating of the first reference current, and a reference voltage coupled to a non-inverting input of the amplifier, where a level of the reference voltage is increased at least at initiation of the ADC operation in response to the injection current pulse.

5. 发明授权

US10044948B2 Image sensor global shutter supply circuit with variable bandwidth 有权
公开(公告)号：US10044948B2
公开(公告)日：2018-08-07
申请号：US14939868
申请日：2015-11-12
申请人： OMNIVISION TECHNOLOGIES, INC.
发明人： Liping Deng , Zhiqiang Song , Pengting Zhang , Yi Liu
IPC分类号： H04N5/225 , H04N5/353 , H04N5/378 , H04N5/357 , H04N5/3745
摘要： 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.

6. 发明申请

US20180167573A1 CURRENT INJECTION FOR FAST RAMP START-UP DURING ANALOG-TO-DIGITAL OPERATIONS 审中-公开
公开(公告)号：US20180167573A1
公开(公告)日：2018-06-14
申请号：US15376352
申请日：2016-12-12
申请人： OMNIVISION TECHNOLOGIES, INC.
发明人： Fan Zhu , Yu-Shen Yang , Yingkan Lin , Zejian Wang , Liping Deng
IPC分类号： H04N5/378 , H03M1/34 , H03M1/66 , H03K4/90
CPC分类号： H04N5/378 , H03K4/90 , H03M1/34 , H03M1/56 , H03M1/66
摘要： An example method for fast ramp start-up during analog to digital conversion (ADC) includes opening a feedback bypass switch coupled to an amplifier to initiate an ADC operation, providing an injection current pulse to an inverting input of the amplifier, where the non-inverting input is coupled to a feedback bypass switch, integrating a first reference current coupled to the inverting input of the amplifier, where the integrating of the first reference current occurs due to the opening of the feedback bypass switch, and providing a reference voltage in response to the injection current pulse, the integrating of the first reference current, and a reference voltage coupled to a non-inverting input of the amplifier, where a level of the reference voltage is increased at least at initiation of the ADC operation in response to the injection current pulse.

7. 发明授权

US09838623B2 Global shutter control signal generator with reduced driving requirements 有权
公开(公告)号：US09838623B2
公开(公告)日：2017-12-05
申请号：US14939862
申请日：2015-11-12
申请人： OMNIVISION TECHNOLOGIES, INC.
发明人： Liping Deng , Zhiqiang Song , Pengting Zhang , Yi Liu
IPC分类号： H04N5/353 , H04N5/378
CPC分类号： H04N5/3532 , H04N5/353 , H04N5/37452 , H04N5/378
摘要： 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.

8. 发明申请

US20160309106A1 RAMP GENERATOR FOR LOW NOISE IMAGE SENSOR 有权
标题翻译：低噪声图像传感器的RAMP发生器
公开(公告)号：US20160309106A1
公开(公告)日：2016-10-20
申请号：US14688260
申请日：2015-04-16
申请人： OMNIVISION TECHNOLOGIES, INC.
发明人： Liang Zuo , Zhiqiang Song , Liping Deng
IPC分类号： H04N5/378 , H04N5/357
CPC分类号： H04N5/378 , H04N5/357 , H04N5/3745
摘要： A readout circuit for use in an image sensor includes a sense amplifier circuit coupled to a bitline to sense analog image data from a pixel cell of the image sensor. An analog to digital converter is coupled to the sense amplifier circuit to convert the analog image data to digital image data. A ramp generator circuit is coupled to generate a first ramp signal. The analog to digital converter is coupled to generate the digital image data in response to the analog image data and the first ramp signal. A first capacitive voltage divider is coupled to the ramp generator. The first capacitive voltage divider is coupled to reduce an output voltage swing of the first ramp signal coupled to be received by the analog to digital converter to reduce noise in the first ramp signal.
摘要翻译：用于图像传感器的读出电路包括耦合到位线的读出放大器电路，以检测来自图像传感器的像素单元的模拟图像数据。模数转换器耦合到读出放大器电路，以将模拟图像数据转换为数字图像数据。斜坡发生器电路被耦合以产生第一斜坡信号。模拟数字转换器被耦合以响应于模拟图像数据和第一斜坡信号而生成数字图像数据。第一电容分压器耦合到斜坡发生器。第一电容性分压器被耦合以减少耦合以由模数转换器接收的第一斜坡信号的输出电压摆幅，以减少第一斜坡信号中的噪声。

9. 发明授权

US09380208B1 Image sensor power supply rejection ratio noise reduction through ramp generator 有权
标题翻译：图像传感器电源抑制比通过斜坡发生器降噪
公开(公告)号：US09380208B1
公开(公告)日：2016-06-28
申请号：US14685151
申请日：2015-04-13
申请人： OMNIVISION TECHNOLOGIES, INC.
发明人： Bi Yuan , Quifeng Jin , Liping Deng , Liang Zuo
IPC分类号： H04N5/232 , H04N5/357 , H04N5/378 , H04N5/374
CPC分类号： H04N5/23241 , H04N5/357 , H04N5/3577 , H04N5/378
摘要： A ramp generator includes a supply voltage sampling circuit coupled to sample a black signal supply voltage during a black signal readout, and an image signal supply voltage of the pixel cell during an image signal readout of a pixel cell. A first integrator circuit receives a buffered reference voltage, and an output of the supply voltage sampling circuit. First and second switches are coupled between the first integrator circuit and a first capacitor to transfer a signal representative of a difference between the image signal supply voltage and the black signal supply voltage to the first capacitor. A second integrator circuit is coupled to the first capacitor to generate an output ramp signal coupled to be received by an analog to digital converter. A starting value of the output ramp signal is adjusted in response to the difference between the image signal and the black signal supply voltage.
摘要翻译：斜坡发生器包括在黑色信号读出期间耦合以对黑色信号电源电压进行采样的电源电压采样电路，以及在像素单元的图像信号读出期间像素单元的图像信号供应电压。第一积分器电路接收缓冲的参考电压和电源电压采样电路的输出。第一和第二开关耦合在第一积分器电路和第一电容器之间，以将表示图像信号电源电压和黑色信号电源电压之间的差异的信号传送到第一电容器。第二积分器电路耦合到第一电容器以产生耦合以由模数转换器接收的输出斜坡信号。响应于图像信号和黑色信号电源电压之间的差异来调整输出斜坡信号的起始值。

10. 发明申请

US20180324377A1 CURRENT INJECTION FOR FAST RAMP START-UP DURING ANALOG-TO-DIGITAL OPERATIONS 审中-公开
公开(公告)号：US20180324377A1
公开(公告)日：2018-11-08
申请号：US16034226
申请日：2018-07-12
申请人： OmniVision Technologies, Inc.
发明人： Fan Zhu , Yu-Shen Yang , Yingkan Lin , Zejian Wang , Liping Deng
IPC分类号： H04N5/378 , H03M1/34 , H03K4/90 , H03M1/56
CPC分类号： H04N5/378 , H03K4/90 , H03M1/34 , H03M1/56 , H03M1/66
摘要： An example method for fast ramp start-up during analog to digital conversion (ADC) includes opening a feedback bypass switch coupled to an amplifier to initiate an ADC operation, providing an injection current pulse to an inverting input of the amplifier, where the non-inverting input is coupled to a feedback bypass switch, integrating a first reference current coupled to the inverting input of the amplifier, where the integrating of the first reference current occurs due to the opening of the feedback bypass switch, and providing a reference voltage in response to the injection current pulse, the integrating of the first reference current, and a reference voltage coupled to a non-inverting input of the amplifier, where a level of the reference voltage is increased at least at initiation of the ADC operation in response to the injection current pulse.

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