Title: A Gain-Adaptive Column Amplifier for Wide-Dynamic-Range CMOS Image Sensors
Authors: Le, Thai Ha ×
Xhakoni, Adi
Gielen, Georges #
Issue Date: Oct-2013
Publisher: Institute of Electrical and Electronics Engineers
Series Title: IEEE Transactions on Electron Devices vol:60 issue:10 pages:3601-3604
Article number: 0018-9383
Abstract: A robust gain-adaptive column amplifier scheme,
which is friendly to the digital correlated multiple sampling(DCMS) A/D conversion is proposed to extend the dynamic range of CMOS image sensors. It lowers the noise at low light levels and relaxes the gain to prevent saturation at high light levels,while a low-noise readout circuit is not necessary because of the dominance of photon shot noise. Since the difference between the reset and the signal levels at a 4-T pixel output is compared with reference voltages to detect the suitable gain values, the
fixed pattern noise (FPN) caused by this gain-detection scheme is estimated to be 20 times lower than that of the work in which only the pixel signal level is compared. Operation analysis and Monte Carlo simulations show the immunity of the circuit to unwanted offsets. Noise analysis and SNR calculation show that the FPN by the gain-detection scheme is more suppressed with either more gain options or the DCMS conversion applied at the amplifier output. A column-level design with a size of 9×500 μm and a current consumption of 12μA is discussed to demonstrate the feasibility of the idea.
ISSN: 0018-9383
Publication status: published
KU Leuven publication type: IT
Appears in Collections:ESAT - MICAS, Microelectronics and Sensors
× corresponding author
# (joint) last author

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