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1.发明申请公开(公告)号：US20170054931A1
公开(公告)日：2017-02-23
申请号：US14828404
申请日：2015-08-17
Applicant: OMNIVISION TECHNOLOGIES, INC.
Inventor： Rui Wang , Le Huang , Tianjia Sun , Tiejun Dai
Abstract: Techniques and mechanisms to mitigate fixed pattern noise in image sensor data. In an embodiment, readout circuitry includes an adaptive analog-to-digital converter (ADC) comprising a differential amplifier and a feedback path coupled across the differential amplifier, where the ADC is to receive a ramp signal, a control signal associated with a transition rate of the ramp signal, and an analog signal generated by one or more pixels. In another embodiment, the feedback path and/or one or more other circuit elements coupled to the differential amplifier are configured, based on the control signal, to provide one of multiple loop gains with the differential amplifier. The ADC provides a digital output to determine a comparison based on the ramp signal and the analog signal.
Abstract translation: 降低图像传感器数据中固定模式噪声的技术和机制。 在一个实施例中，读出电路包括自适应模数转换器（ADC），该自适应模数转换器（ADC）包括差分放大器和耦合在差分放大器两端的反馈路径，其中ADC将接收斜坡信号，与转换速率相关的控制信号 的斜坡信号，以及由一个或多个像素产生的模拟信号。 在另一个实施例中，耦合到差分放大器的反馈路径和/或一个或多个其他电路元件基于控制信号被配置为提供差分放大器的多个环路增益之一。 ADC提供数字输出，以确定基于斜坡信号和模拟信号的比较。
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公开(公告)号：US09819890B2
公开(公告)日：2017-11-14
申请号：US14828404
申请日：2015-08-17
Applicant: OMNIVISION TECHNOLOGIES, INC.
Inventor： Rui Wang , Le Huang , Tianjia Sun , Tiejun Dai
Abstract: Techniques and mechanisms to mitigate fixed pattern noise in image sensor data. In an embodiment, readout circuitry includes an adaptive analog-to-digital converter (ADC) comprising a differential amplifier and a feedback path coupled across the differential amplifier, where the ADC is to receive a ramp signal, a control signal associated with a transition rate of the ramp signal, and an analog signal generated by one or more pixels. In another embodiment, the feedback path and/or one or more other circuit elements coupled to the differential amplifier are configured, based on the control signal, to provide one of multiple loop gains with the differential amplifier. The ADC provides a digital output to determine a comparison based on the ramp signal and the analog signal.
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