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A CMOS Image Sensor with a Buried-Channel Source Follower

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5 Author(s)
Xinyang Wang ; Delft Univ. of Technol., Delft ; Snoeij, M.F. ; Rao, P.R. ; Mierop, A.
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This paper presents a CMOS image sensor with a pinned-photodiode 4T active-pixel design (APS) that uses a buried-channel source follower (BSF) as the in-pixel amplifier. A prototype of the image sensor has been fabricated in a 0.18mum CMOS process. Measurements show that compared to a regular imager with a standard nMOS transistor surface-mode source follower (SSF), the new pixel structure reduces dark random noise by more than 50% and improves output swing by almost 100%.

Published in:

Solid-State Circuits Conference, 2008. ISSCC 2008. Digest of Technical Papers. IEEE International

Date of Conference:

3-7 Feb. 2008

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