PTC Inspired Column Level Compression in Low Power CMOS Imagers
نویسنده
چکیده
The overall power consumption of CMOS imagers is dominated by the communication layer. A number of compression techniques have been introduced in the processing layer to reduce the power consumption of the communication layer. These compression techniques use redundancy present in the spatial or temporal domain. This work presents an algorithm to compress the depth of the pixel in the digital domain. The compression scheme remains loss-less due to the presence of photon shot noise which dominates at high light intensities. Photon-transfer-curve (PTC) inspired analog-to-digital (ADC) converters, realized using bandwidth-limited micro-power comparators have an inherent non-linearity problem. This paper analyzes the said non-linearity, and proposes a solution to eliminate the non-linearity. The improved linearity results in increased conversion speed of two-step slope ADCs.
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تاریخ انتشار 2015