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11. 发明授权

US09876979B1 Current generator 有权
公开(公告)号：US09876979B1
公开(公告)日：2018-01-23
申请号：US15371009
申请日：2016-12-06
申请人： OMNIVISION TECHNOLOGIES, INC.
发明人： Chun-Hsiang Chang , Yu-Shen Yang , Yingkan Lin , Liping Deng
IPC分类号： H01L27/146 , H03B5/12 , H03B5/36 , H04N5/378 , G05F1/575 , H04N5/374 , H04N5/953
CPC分类号： H04N5/378 , G05F1/575 , H01L27/14643 , H03B5/1271 , H03B5/366 , H03B2201/0275 , H04N5/374 , H04N5/953
摘要： An example current generator may include a low dropout regulator (LDO) coupled to receive a reference voltage and provide a reference current in response, where the LDO adjusts a current level of the current reference in response to a calibration signal. A current controlled oscillator coupled to receive a reference current copy from the LDO and generate an oscillating signal in response, where a period of the oscillating signal is based at least in part on a level of the reference current copy. A pulse generator coupled to provide an adjustable pulse signal. A counter coupled to determine a number of periods of the oscillating signal occurring during a duration of the pulse signal, and provide a control signal indicative of such, and a digital calibration circuit coupled to receive the control signal and provide the calibration signal to the LDO in response.

12. 发明授权

US09848152B1 Analog dithering to reduce vertical fixed pattern noise in image sensors 有权
公开(公告)号：US09848152B1
公开(公告)日：2017-12-19
申请号：US15277859
申请日：2016-09-27
申请人： OMNIVISION TECHNOLOGIES, INC.
发明人： Yingkan Lin , Yu-Shen Yang , Liping Deng
IPC分类号： H04N5/378 , H03K4/50 , H03M1/06 , H03K4/502
CPC分类号： H04N5/378 , H03M1/0639 , H03M1/56 , H04N5/365
摘要： Apparatuses and methods for reducing vertical fixed pattern noise in imaging systems are disclosed herein. An example apparatus may include an analog dithering circuit coupled to randomly add an offset voltage to a first reference voltage in response to a random binary signal during an analog to digital conversion operation, and a ramp generator circuit coupled to receive the first reference voltage, and provide a second reference voltage in response, wherein the randomly added offset voltage to the first reference is also present in the second reference voltage.

13. 发明授权

US09848140B2 Horizontal banding reduction with ramp generator isolation in an image sensor 有权
公开(公告)号：US09848140B2
公开(公告)日：2017-12-19
申请号：US15087253
申请日：2016-03-31
申请人： OMNIVISION TECHNOLOGIES, INC.
发明人： Liping Deng , Min Qu , Bi Yuan , Yingkan Lin
IPC分类号： H04N5/357 , H04N5/378 , H04N5/376 , H04N5/369 , H04N5/3745
CPC分类号： H04N5/357 , H04N5/3698 , H04N5/37455 , H04N5/37457 , H04N5/3765 , H04N5/378
摘要： A readout circuit for use in an image sensor includes a system ramp generator coupled to generate a system ramp signal. A plurality of analog-to-digital converters is coupled to a plurality of column bitlines from a pixel array to receive corresponding analog column image signals. An isolation ramp buffer is coupled between the system ramp generator and the analog-to-digital converters. The isolation ramp buffer includes a single input to receive the system ramp signal, and a plurality of isolated outputs. Each of the isolated outputs is coupled to provide an isolated column ramp signal to a corresponding analog-to-digital converter. Each of the of analog-to-digital converters is coupled to generate a corresponding digital column image signal in response to the corresponding analog column image signal and corresponding isolated column ramp signal.

14. 发明申请

US20170168104A1 IMAGE SENSOR POWER SUPPLY NOISE DETECTION 有权
公开(公告)号：US20170168104A1
公开(公告)日：2017-06-15
申请号：US14964159
申请日：2015-12-09
申请人： OMNIVISION TECHNOLOGIES, INC.
发明人： Yingkan Lin , Liang Zuo , Liping Deng
IPC分类号： G01R29/26
CPC分类号： G01R29/26 , G01R31/40
摘要： A power supply noise measurement circuit includes a multiphase filter coupled to receive a power supply signal. The multiphase filter is coupled to output a first filtered power supply signal for a first phase, and a second filtered power supply signal for a second phase. A multiphase amplifier is coupled to the multiphase filter to sample offset voltages in response to the first filter power supply signal during the first phase to set up DC operation points in the multiphase amplifier, and generate an amplified power supply noise signal during the second phase. An overshoot detector is coupled to the multiphase amplifier to detect overshoot events in the amplified power supply noise signal, and an undershoot detector is coupled to the multiphase amplifier to detect undershoot events in the amplified power supply noise signal.

15. 发明申请

US20170142355A1 GLOBAL SHUTTER CONTROL SIGNAL GENERATOR WITH REDUCED DRIVING REQUIREMENTS 有权
公开(公告)号：US20170142355A1
公开(公告)日：2017-05-18
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.

16. 发明授权

US09571775B1 Image sensor power supply rejection ratio improvement through ramp generator in continuous time readout circuitry 有权
标题翻译：通过连续时间读出电路中的斜坡发生器改善图像传感器电源抑制比
公开(公告)号：US09571775B1
公开(公告)日：2017-02-14
申请号：US14942622
申请日：2015-11-16
申请人： OMNIVISION TECHNOLOGIES, INC.
发明人： Liang Zuo , Zhihao Xu , Bi Yuan , Liping Deng , Yuxin Wang
IPC分类号： H04N5/335 , H04N3/14 , H04N5/378 , H04N5/369 , H04N5/376 , H04N5/225
CPC分类号： H04N5/378 , H04N5/3698
摘要： A ramp generator for use in readout circuitry includes an integrator coupled to receive a ramp generator input reference signal to generate a reference ramp signal coupled to be received by an analog to digital converter. A power supply compensation circuit that is coupled to generate the ramp generator input reference signal includes a delay circuit including a variable resistor and a filter capacitor coupled to receive a power supply signal. The variable resistor is tuned to match a delay ripple from the power supply to a bitline output. A capacitive voltage divider is coupled to the delay circuit to generate the ramp generator input reference signal. The capacitive voltage divider includes a first variable capacitor coupled to a second variable capacitor that are tuned to provide a capacitance ratio that matches a coupling ratio from the power supply to the bitline output.
摘要翻译：用于读出电路的斜坡发生器包括一个积分器，该积分器被耦合以接收斜坡发生器输入参考信号，以产生耦合以由模数转换器接收的参考斜坡信号。耦合以产生斜坡发生器输入参考信号的电源补偿电路包括延迟电路，该延迟电路包括耦合以接收电源信号的可变电阻器和滤波电容器。调整可变电阻以匹配从电源到位线输出的延迟纹波。电容分压器耦合到延迟电路以产生斜坡发生器输入参考信号。电容分压器包括耦合到第二可变电容器的第一可变电容器，其被调谐以提供与从电源到位线输出的耦合比匹配的电容比。

17. 发明授权

US09148596B1 Feed-forward technique for power supply rejection ratio improvement of bit line 有权
标题翻译：前馈技术的电源抑制比提高了位线
公开(公告)号：US09148596B1
公开(公告)日：2015-09-29
申请号：US14247855
申请日：2014-04-08
申请人： OMNIVISION TECHNOLOGIES, INC.
发明人： Tianjia Sun , Rui Wang , Liping Deng , Tiejun Dai
IPC分类号： H04N5/369 , H04N5/357
CPC分类号： H04N5/3698 , H04N5/357 , H04N5/378
摘要： An image sensor read out circuit includes a first current mirror circuit in which a second current conducted through a second current path is controlled in response to a first current conducted through the first current path. The second current is conducted through an amplifier transistor of a pixel circuit. A first current source is coupled to the first current path to provide a substantially constant current component of the first current. A second current source is coupled to a power supply rail of the pixel circuit and coupled to the first current path to provide a ripple current component of the first current. The ripple current component provided by the second current source is responsive to a ripple in the power supply rail. The first current is responsive to a sum of the currents from the first and second current sources.
摘要翻译：图像传感器读出电路包括第一电流镜电路，其中响应于通过第一电流路径传导的第一电流来控制通过第二电流路径传导的第二电流。第二电流通过像素电路的放大器晶体管导通。第一电流源耦合到第一电流路径以提供第一电流的基本上恒定的电流分量。第二电流源耦合到像素电路的电源轨，并耦合到第一电流路径以提供第一电流的纹波电流分量。由第二电流源提供的纹波电流分量响应于电源轨道中的纹波。第一电流响应于来自第一和第二电流源的电流的总和。

18. 发明授权

US09817048B2 Image sensor power supply noise detection 有权
公开(公告)号：US09817048B2
公开(公告)日：2017-11-14
申请号：US14964159
申请日：2015-12-09
申请人： OMNIVISION TECHNOLOGIES, INC.
发明人： Yingkan Lin , Liang Zuo , Liping Deng
IPC分类号： G01R29/26
CPC分类号： G01R29/26 , G01R31/40
摘要： A power supply noise measurement circuit includes a multiphase filter coupled to receive a power supply signal. The multiphase filter is coupled to output a first filtered power supply signal for a first phase, and a second filtered power supply signal for a second phase. A multiphase amplifier is coupled to the multiphase filter to sample offset voltages in response to the first filter power supply signal during the first phase to set up DC operation points in the multiphase amplifier, and generate an amplified power supply noise signal during the second phase. An overshoot detector is coupled to the multiphase amplifier to detect overshoot events in the amplified power supply noise signal, and an undershoot detector is coupled to the multiphase amplifier to detect undershoot events in the amplified power supply noise signal.

19. 发明授权

US09554074B2 Ramp generator for low noise image sensor 有权
标题翻译：用于低噪声图像传感器的斜坡发生器
公开(公告)号：US09554074B2
公开(公告)日：2017-01-24
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。

20. 发明申请

US20170359532A1 IMAGE SENSOR PIXEL NOISE MEASUREMENT 有权
公开(公告)号：US20170359532A1
公开(公告)日：2017-12-14
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.

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