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A variety of smart imaging and neuromorphic applications perform time-domain image acquisition in order to imitate biological systems and reduce the growing transmission bandwidth of the modern imaging devices. Because they operate in time-domain, they require the highest possible pixel responsivity and response speed. This work provides a comparative experimental study of different unconventional...
Several on-chip photodetecting device structures are designed using a low-cost standard 0.18µm CMOS process. The comparison in terms of measured light responsivity and the response speed is presented between conventional and comb-shaped Nwell-Psubstrate photodiodes, conventional and comb-shaped, vertical and lateral bipolar-junction phototransistors and a Darlington pair of bipolar-junction phototransistors...
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