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A novel type of CMOS image sensor (CIS) leveraging two types of analog-to-digital converters (ADCs) is presented in this work. Contrary to conventional ΣΔ image sensors, which implement ΣΔ ADCs at the column or pixel array level, this work utilizes the pixel structure as part of the ΣΔ modulator to enhance the noise shaping capabilities of the readout scheme. The overall speed performance of this...
A novel architecture for a CMOS image sensor that incorporates a column-level sigma-delta (ΣΔ) analog-to-digital converter is presented. An indirect-feedback readout architecture where the digital output of the ΣΔ modulator is accumulated by a digital counter and converted to an analog voltage that serves as the reference voltage in the modulator's comparator is employed. A time-domain pixel simulator...
A novel architecture for a CMOS image sensor that incorporates a column-level sigma-delta (ΣΔ) analog-to-digital converter is presented. An indirect-feedback readout architecture where the digital output of the ΣΔ modulator is accumulated by a digital counter and converted to an analog voltage that serves as the reference voltage to which the buffered photodiode voltage is compared is shown. A time-domain...
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