Abstract
This paper surveys recent research on CMOS silicon avalanche photodiodes (SiAPD) and presents the design of a SiAPD based photoreceiver dedicated to near-infrared spectroscopy (NIRS) application. Near-infrared spectroscopy provides an inexpensive, non-invasive, and portable means to image brain function, and is one of the most efficient diagnostic techniques of different neurological diseases. In NIRS system, brain tissue is penetrated by near-infrared (NIR) radiation and the reflected signal is captured by a photodiode. Since the reflected NIR signal has very low amplitude, SiAPD is a better choice than regular photodiode for NIR signal detection due to SiAPD`s ability to amplify the photo generated signal by avalanche multiplication. Design requirements of using CMOS SiAPDs for NIR light detection are discussed, and the challenges of fabricating SiAPDs using standard CMOS process are addressed. Performances of state-of-the-art CMOS SiAPDs with different device structures are summarized and compared. The efficacy of the proposed SiAPD based photoreceiver is confirmed by post layout simulation. Finally, the SiAPD and its associated circuits has been implemented in one chip using 0.35 μm standard CMOS technology for an integrated NIRS system.
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We gratefully acknowledge financial support from the Heart and Stroke Foundation of Canada (HSFC) and the Canadian Institutes of Health Research (CIHR).
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Sultana, A., Kamrani, E. & Sawan, M. CMOS silicon avalanche photodiodes for NIR light detection: a survey. Analog Integr Circ Sig Process 70, 1–13 (2012). https://doi.org/10.1007/s10470-011-9641-6
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DOI: https://doi.org/10.1007/s10470-011-9641-6