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公开(公告)号：US09817048B2
公开(公告)日：2017-11-14
申请号：US14964159
申请日：2015-12-09
Applicant: OMNIVISION TECHNOLOGIES, INC.
Inventor： Yingkan Lin , Liang Zuo , Liping Deng
IPC: G01R29/26
Abstract: 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.
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2.发明申请公开(公告)号：US20190222780A1
公开(公告)日：2019-07-18
申请号：US15872741
申请日：2018-01-16
Applicant: OmniVision Technologies, Inc.
Inventor： Chun-Hsiang Chang , Yingkan Lin , Jingwei Lai , Zhe Gao
CPC classification number: H04N5/355 , H04N5/2355 , H04N5/3559 , H04N5/37452 , H04N5/378
Abstract: A readout circuit includes a comparator coupled to receive a ramp signal an output of a dual conversion gain pixel. A single counter is coupled to the output of the comparator. The counter is coupled to write to only one of a first or a second memory circuits at a time. A first multiplexor is coupled to load either an initial value or an initial memory value from the first memory circuit into the counter. A second multiplexor is coupled to load either a low conversion gain memory value from the first memory circuit or a high conversion gain memory value from the second memory circuit into a single data transmitter, which is coupled to transmit the received memory value to a digital processor.
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公开(公告)号：US10051225B2
公开(公告)日：2018-08-14
申请号：US15376352
申请日：2016-12-12
Applicant: OMNIVISION TECHNOLOGIES, INC.
Inventor： Fan Zhu , Yu-Shen Yang , Yingkan Lin , Zejian Wang , Liping Deng
Abstract: 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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公开(公告)号：US09961281B2
公开(公告)日：2018-05-01
申请号：US15179648
申请日：2016-06-10
Applicant: OMNIVISION TECHNOLOGIES, INC.
Inventor： Bi Yuan , Liping Deng , Yingkan Lin , Liang Zuo , Yuxin Wang
Abstract: 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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公开(公告)号：US20180324377A1
公开(公告)日：2018-11-08
申请号：US16034226
申请日：2018-07-12
Applicant: OmniVision Technologies, Inc.
Inventor： Fan Zhu , Yu-Shen Yang , Yingkan Lin , Zejian Wang , Liping Deng
Abstract: 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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Patent Agency Ranking
公开(公告)号：US09876979B1
公开(公告)日：2018-01-23
申请号：US15371009
申请日：2016-12-06
Applicant: OMNIVISION TECHNOLOGIES, INC.
Inventor： Chun-Hsiang Chang , Yu-Shen Yang , Yingkan Lin , Liping Deng
CPC classification number: H04N5/378 , G05F1/575 , H01L27/14643 , H03B5/1271 , H03B5/366 , H03B2201/0275 , H04N5/374 , H04N5/953
Abstract: 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.
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公开(公告)号：US09848152B1
公开(公告)日：2017-12-19
申请号：US15277859
申请日：2016-09-27
Applicant: OMNIVISION TECHNOLOGIES, INC.
Inventor： Yingkan Lin , Yu-Shen Yang , Liping Deng
CPC classification number: H04N5/378 , H03M1/0639 , H03M1/56 , H04N5/365
Abstract: 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.
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公开(公告)号：US09848140B2
公开(公告)日：2017-12-19
申请号：US15087253
申请日：2016-03-31
Applicant: OMNIVISION TECHNOLOGIES, INC.
Inventor： Liping Deng , Min Qu , Bi Yuan , Yingkan Lin
IPC: H04N5/357 , H04N5/378 , H04N5/376 , H04N5/369 , H04N5/3745
CPC classification number: H04N5/357 , H04N5/3698 , H04N5/37455 , H04N5/37457 , H04N5/3765 , H04N5/378
Abstract: 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.
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公开(公告)号：US20170168104A1
公开(公告)日：2017-06-15
申请号：US14964159
申请日：2015-12-09
Applicant: OMNIVISION TECHNOLOGIES, INC.
Inventor： Yingkan Lin , Liang Zuo , Liping Deng
IPC: G01R29/26
Abstract: 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.
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公开(公告)号：US10187602B2
公开(公告)日：2019-01-22
申请号：US16034226
申请日：2018-07-12
Applicant: OmniVision Technologies, Inc.
Inventor： Fan Zhu , Yu-Shen Yang , Yingkan Lin , Zejian Wang , Liping Deng
Abstract: 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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