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A wide dynamic range CMOS image sensor (CIS) based on the synthesis of long and short exposure signals is proposed. To achieve the high-speed readout, a high speed, 12-bit column-parallel incremental sigma-delta (ΣΔ) ADC including digital correlated double sampling (CDS) is developed to implement the synthesis of dual-exposure data on chip. Since the use of ΣΔADC, it does not require huge frame memory...
A 60frames/s CMOS image sensor with column-parallel inverter-based sigma–delta (ΣΔ) ADCs is proposed in this paper. In order to improve the robustness of the inverter, instead of constant power supply, two buffers are designed to provide power supply for inverters. Instead of using of an operational amplifier, an inverter-based switch-capacitor (SC) circuit is adopted to low-voltage low-power ΣΔ modulator...
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