High dynamic range pixel architecture with smart light intensity decision unit/
Yazıcı, Melik (2016) High dynamic range pixel architecture with smart light intensity decision unit/. [Thesis]
In this thesis, a novel pixel architecture for third generation infrared detectors is proposed. This smart design introduces ﬂux detection mechanism for the broad spectrum short wave infrared detector and dual/multicolor detectors. This archi-tecture achieves very high dynamic range for analog ROICs. DR for ROIC means very dark and very bright signal levels is processed at the same time. In practical terms, HDR enables high contrast and accuracy which ﬁnds itself many applications from security to industry. The typical unit cell of a ROIC consists of the pre-ampliﬁer, gain switches, multiplexer, output ampliﬁer and some control switches. For a standard single band detector array, a ROIC uses only a single pre-ampliﬁer which optimized for average performance. In the proposed architecture, instead of using a single preampliﬁer, two pre-ampliﬁers, which are optimized for diﬀerent light levels, are placed inside each pixel. A smart circuit mechanism, which decides the best input circuit according to the incoming light level, is also designed for the pixel. In short, the smart pixel selects the best input ampliﬁer circuit that performs the best SNR for the incoming signal level. A 32x32 prototype chip is designed in 0.18 µm CMOS technology. Chip achieves minimum 8.6 e− input referred noise and 98.9 dB dynamic range. Operating temperature is 300 K and power consumption is 2.8 µW per pixel.
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