METHOD AND SYSTEM FOR REDUCING NOISE IN AN IMAGE SENSOR USING A PARALLEL MULTI-RAMPS MERGED COMPARATOR ANALOG-TO-DIGITAL CONVERTER
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United States of America Patent
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Dec 30, 2015
filing date -
Dec 30, 2015
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Abstract
A method of reducing noise in an image sensor using a parallel multi-ramps merged comparator analog-to-digital converter (ADC) starts with a pixel array capturing image data. The pixel array includes pixels to generate pixel data signals, respectively. An ADC circuitry acquires the pixel data signals. The ADC circuitry includes ADC circuits. Each of the ADC circuits includes a comparator and ADC counters. The comparator includes a multi-input first stage. The comparator in each ADC circuit compares one of the pixel data signals to ramp signals received from a logic circuitry to generate comparator output signals. The ADC counters in each ADC circuit counting based on the comparator output signals, respectively, to generate ADC outputs. Other embodiments are described.
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