A Sub- $\mu\hbox {W}$ Fully Tunable CMOS DPS for Uncooled Infrared Fast Imaging

This paper presents a very low-power and fully programmable CMOS digital active pixel sensor for uncooled IR fast imaging. The proposed circuit topology includes self-biasing, built-in input capacitance compensation, predictive A/D conversion, and a truly digital I/O interface, all at pixel level. Furthermore, full fixed pattern noise cancellation is also supplied by the external digital tuning of both offset and gain for each individual pixel at no speed costs. Two DPS circuit implementations for IR PbSe sensors have been integrated in standard 0.35-mum 2-polySi 4-metal CMOS technology. Finally, exhaustive experimental results from their electrical tests are reported to validate the proposed DPS design techniques.