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This paper presents two low-light-level CMOS image sensors with capacitive transimpedance amplifier (CTIA) and digital correlated double sampling (CDS). In order to achieve high sensitivity for low-light-level CMOS image sensor, the CTIA pixel circuit with a small integration capacitor is used. In order to remove the noise of the low-light-level CMOS image sensor, a digital CDS is designed, which...
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