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Title : 2-step Column-Parallel Delta-Sigma ADC
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2-step Column-Parallel Delta-Sigma ADC

CentraleSupelec, France, publishes a paper "A 14-b Two-step Inverter-based Σ∆ ADC for CMOS Image Sensor" by Pierre Bisiaux, Caroline Lelandais-Perrault, Anthony Kolar, Philippe Benabes, and Filipe Vinci dos Santos presented at IEEE International NEWCAS Conference, in June 2017 at Strasbourg, France.

"This paper presents a 14-bit Incremental Sigma Delta (IΣ∆) analog-to-digital converter (ADC) suitable for a column wise integration in a CMOS image sensor. A two-step conversion is performed to improve the conversion speed. As the same Σ∆ modulator is used for both steps, the overall complexity is reduced. Furthermore, the use of inverter-based amplifiers instead of operational transconductance amplifier (OTA) facilitates the integration within the column pitch and decreases power consumption. The proposed ADC is designed in 0.18 µm CMOS technology. The simulation shows that for a 1.8 V voltage supply, a 20 MHz clock frequency and an oversampling ratio (OSR) of 70, the power consumption is 460 µW, achieving an SNR of 83.7 dB."

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