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Sensors 2018, 18(11), 3683; https://doi.org/10.3390/s18113683

Analysis and Design of a CMOS Ultra-High-Speed Burst Mode Imager with In-Situ Storage Topology Featuring In-Pixel CDS Amplification

1
Imec, 3001 Heverlee, Belgium
2
Department of Electronics and informatics (ETRO), Vrije Universiteit Brussel, 1050 Brussels, Belgium
*
Author to whom correspondence should be addressed.
Received: 23 September 2018 / Revised: 20 October 2018 / Accepted: 26 October 2018 / Published: 30 October 2018
(This article belongs to the Section Physical Sensors)
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Abstract

This paper presents an in-situ storage topology for ultra-high-speed burst mode imagers, enabling low noise operation while keeping a high frame depth. The proposed pixel architecture contains a 4T pinned photodiode, a correlated double sampling (CDS) amplification stage, and an in-situ memory bank. Focusing on the sampling noise, the system level trade-off of the proposed pixel architecture is discussed, showing its advantages on the noise, power, and scaling capability. Integrated with an AC coupling CDS stage, the amplification is obtained by exploiting the strong capacitance to the voltage relation of a single NMOS transistor. A comprehensive noise model is developed for optimizing the trade-off between the area and noise. As a proof-of-concept, a prototype imager with a 30 µm pixel pitch was fabricated in a CMOS 130 nm technology. A 108-cell memory bank is implemented allowing dense layout and parallel readout. Two types of CDS amplification stages were investigated. Despite the limited memory capacitance of 10 fF/cell, the photon transfer curves of both pixel types were measured over different operation speeds up to 20 Mfps showing a noise performance of 8.4 e. View Full-Text
Keywords: image sensors; in-situ storage; ultra-high-speed imaging; burst mode; million frames per second; in-pixel amplification image sensors; in-situ storage; ultra-high-speed imaging; burst mode; million frames per second; in-pixel amplification
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Wu, L.; San Segundo Bello, D.; Coppejans, P.; Craninckx, J.; Süss, A.; Rosmeulen, M.; Wambacq, P.; Borremans, J. Analysis and Design of a CMOS Ultra-High-Speed Burst Mode Imager with In-Situ Storage Topology Featuring In-Pixel CDS Amplification. Sensors 2018, 18, 3683.

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