Floating Source/Drain Enabled Linear-Linear-Logarithmic Self-Adaptive One-Transistor Active Pixel Sensor

In this work, a novel one-transistor active pixel sensor (1T-APS) with adjustable self-adaptive sensitivity enabled by floating source/drain (S/D) is demonstrated on 22-nm fully depleted Si-on-insulator (FD-SOI) platform. Additional control gates (CGs) with floating S/Ds are incorporated into the se...

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Bibliographic Details
Published in:IEEE transactions on electron devices 2022-09, Vol.69 (9), p.4976-4980
Main Authors: Liu, J., Wang, Xue-Jiao, Jiang, Yu-Long, Wan, J.
Format: Article
Language:English
Subjects:
Active control
Active pixel sensors
Capacitance
Capacitors
Fully depleted Si on insulator (FD-SOI)
high dynamic range (HDR)
Illumination
Image quality
Lighting
Logarithms
Logic gates
one-transistor active pixel sensor (1T-APS)
Photodiodes
Pixels
self-adaptive sensitivity
Semiconductor devices
Sensitivity
Sensors
Silicon
Substrates
Transistors
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Description
Summary:In this work, a novel one-transistor active pixel sensor (1T-APS) with adjustable self-adaptive sensitivity enabled by floating source/drain (S/D) is demonstrated on 22-nm fully depleted Si-on-insulator (FD-SOI) platform. Additional control gates (CGs) with floating S/Ds are incorporated into the sensor, which are parallel to the sensing gate (SG). For weak illumination, the CG channel keeps closed so that the photoresponse is only active for SG controlled region, resulting in high linear sensitivity, while the CG channel will automatically turn on when the illumination is strong enough. Correspondingly, the CG controlled region is connected with SG controlled region for photoresponse together, resulting in a relatively lower linear sensitivity. For very strong illumination, the 1T-APS will automatically switch to logarithmic response mode due to the activated virtual photodiode in the FD-SOI substrate. The sensitivity transition points in the linear-linear region and the linear-logarithmic region can be further adjusted by the bias of CG and back gate, respectively. The adjustable self-adaptive sensitivity indicates the great potential of the proposed 1T-APS for high-quality image sensing.
ISSN:0018-9383
1557-9646
DOI:10.1109/TED.2022.3191289