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Digital Pixel Sensor Array with Logarithmic Delta-Sigma Architecture
AbstractLike the human eye, logarithmic image sensors achieve wide dynamic range easily at video rates, but, unlike the human eye, they suffer from low peak signal-to-noise-and-distortion ratios (PSNDRs). To improve the PSNDR, we propose integrating a delta-sigma analog-to-digital converter (ADC) in each pixel. An image sensor employing this architecture is designed, built and tested in 0.18 micron complementary metal-oxide-semiconductor (CMOS) technology. It achieves a PSNDR better than state-of-the-art logarithmic sensors and comparable to the human eye. As the approach concerns an array of many ADCs, we use a small-area low-power delta-sigma design. For scalability, each pixel has its own decimator. The prototype is compared to a variety of other image sensors, linear and nonlinear, from industry and academia.
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Mahmoodi, A.; Li, J.; Joseph, D. Digital Pixel Sensor Array with Logarithmic Delta-Sigma Architecture. Sensors 2013, 13, 10765-10782.View more citation formats
Mahmoodi A, Li J, Joseph D. Digital Pixel Sensor Array with Logarithmic Delta-Sigma Architecture. Sensors. 2013; 13(8):10765-10782.Chicago/Turabian Style
Mahmoodi, Alireza; Li, Jing; Joseph, Dileepan. 2013. "Digital Pixel Sensor Array with Logarithmic Delta-Sigma Architecture." Sensors 13, no. 8: 10765-10782.
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