Analog-to-digital converter with redundancy for image sensor readout
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United States of America Patent
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Jan 17, 2017
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Jan 8, 2015
app pub date -
Jul 3, 2014
filing date -
Jul 3, 2013
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Abstract
Methods and systems for analog-to-digital conversion applicable to an image sensor, such as a CMOS image sensor, in which an ADC comprises built-in redundancy such that the ADC can start its conversion cycle before the ADC input settles to a desired resolution and the ADC can yet accurately convert the ADC input to a digital value with the desired resolution. In a CMOS image sensor, such an ADC configuration enables the pixel readout time to overlap with the ADC conversion time, reducing the total time needed to convert the pixel signal value to a digital value with the desired resolution.
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