15 May 2001 CMOS smart pixel for free-space optical communication
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Abstract
Fully integrated imaging receivers present a method of low power free-space optical communication with advantages over radio frequency and single element optical communication for a variety of network scenarios. This paper discusses the theoretical performance of such receivers and the design of a single 'smart pixel' for use in a 2.5 Mbps integrated CMOS imaging receiver. The receiver has a simulated input referred noise power of -51 dBm and a dynamic range greater than 30 dB when operating at 2.5 Mbps. Power consumption is less than 50 (mu) W and the pixel fits on a 150 micrometers pitch in a standard 0.35 micrometers digital CMOS process, readily allowing fabrication of inexpensive imaging arrays as large as 64 by 64 pixels. Th receiver presented covers all aspects of reception from optical detection through A/D conversion. An asynchronous digital serial receiver could decode the resulting data stream from this receiver. A low overhead architecture for communicating decoded data packets form any pixel in the imaging array to the edge of the chip is briefly described.
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Brian S. Leibowitz, Bernhard E. Boser, Kristofer S. J. Pister, "CMOS smart pixel for free-space optical communication", Proc. SPIE 4306, Sensors and Camera Systems for Scientific, Industrial, and Digital Photography Applications II, (15 May 2001); doi: 10.1117/12.426966; https://doi.org/10.1117/12.426966
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