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Article

A Low Dark Current 160 dB Logarithmic Pixel with Low Voltage Photodiode Biasing

1
Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, UK
2
Analogue Circuits and Image Sensors, Universität Siegen, Hölderlinstr. 3, 57076 Siegen, Germany
3
Microelectronic Intelligence, Fraunhofer Institute of Microelectronics Circuits and Systems, 47057 Duisburg, Germany
*
Author to whom correspondence should be addressed.
Current Address: Absensing LTD., Oxford, UK.
Academic Editors: Marco Lanuzza, Raffaele De Rose and Sebastiano Strangio
Electronics 2021, 10(9), 1096; https://doi.org/10.3390/electronics10091096
Received: 31 March 2021 / Revised: 1 May 2021 / Accepted: 3 May 2021 / Published: 7 May 2021
(This article belongs to the Special Issue Design of Ultra-Low Voltage/Power Circuits and Systems)
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. View Full-Text
Keywords: CMOS; sub-threshold; pixel; image sensors; logarithmic; high dynamic range CMOS; sub-threshold; pixel; image sensors; logarithmic; high dynamic range
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MDPI and ACS Style

Brunetti, A.M.; Choubey, B. A Low Dark Current 160 dB Logarithmic Pixel with Low Voltage Photodiode Biasing. Electronics 2021, 10, 1096. https://doi.org/10.3390/electronics10091096

AMA Style

Brunetti AM, Choubey B. A Low Dark Current 160 dB Logarithmic Pixel with Low Voltage Photodiode Biasing. Electronics. 2021; 10(9):1096. https://doi.org/10.3390/electronics10091096

Chicago/Turabian Style

Brunetti, Alessandro M., and Bhaskar Choubey. 2021. "A Low Dark Current 160 dB Logarithmic Pixel with Low Voltage Photodiode Biasing" Electronics 10, no. 9: 1096. https://doi.org/10.3390/electronics10091096

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