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A low dark current 160 dB logarithmic pixel with low voltage photodiode biasing

 
: Brunetti, Alessandro Michel; Choubey, Bhaskar

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Volltext ()

Electronics. Online journal 10 (2021), Nr.9, Art. 1096, 10 S.
http://www.mdpi.com/journal/electronics
ISSN: 2079-9292
Englisch
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IMS ()
CMOS (complementary metal oxide semiconductor); sub-threshold; pixel; image sensors; logarithmic; high dynamic range

Abstract
Extending CMOS Image Sensors’ dynamic range is of fundamental importance in applications, such as automotive, scientific, or X-ray, where a broad variation of incoming light should be measured. The typical logarithmic pixels suffer from poor performance under low light conditions due to a leakage current, usually referred to as the dark current. In this paper, we propose a logarithmic pixel design capable of reducing the dark current through low-voltage photodiode biasing, without introducing any process modifications. The proposed pixel combines a high dynamic range with a significant improvement in the dark response compared to a standard logarithmic pixel. The reported experimental results show this architecture to achieve an almost 35 dB improvement at the expense of three additional transistors, thereby achieving an unprecedented dynamic range higher than 160 dB.

: http://publica.fraunhofer.de/dokumente/N-635171.html