TY - GEN
T1 - A 1.2-V reconfigurable resolution CMOS image sensor with energy harvesting capability
AU - Shi, Chao
AU - Bermak, Amine
PY - 2010
Y1 - 2010
N2 - In this paper, we propose a low voltage, low power, reconfigurable resolution CMOS image sensor with energy harvesting capability for wireless image sensor networks. Logarithmic type pixel is adopted to provide a wide dynamic range for image capturing. Semi-pixel level single slope analog- to-digital conversion is realized by employing in-pixel transistors as a part of the column comparator. A correlated double sampling (CDS) control transistor is introduced to remove fixed pattern noise (FPN) due to transistor threshold voltage variations. Energy/power scalability is achieved through reconfiguring the spatial resolution of the imager. The photodiode in the proposed pixel can be used as an energy harvesting device to scavenge energy from the ambient light after photo-sensing. The proposed 64 × 66 imager is designed with AMIS CMOS digital process, and operates at a supply voltage of 1.2V. It can achieve a dynamic range of 108.6dB with an energy efficiency of 10.74nJ/pixel/frame in simulation. A comparison with other reported designs reveals that the proposed imager is one of the most energy efficient imagers of wide dynamic range. Moreover, the energy harvesting capability of the proposed imager could lead to further improved energy efficiency.
AB - In this paper, we propose a low voltage, low power, reconfigurable resolution CMOS image sensor with energy harvesting capability for wireless image sensor networks. Logarithmic type pixel is adopted to provide a wide dynamic range for image capturing. Semi-pixel level single slope analog- to-digital conversion is realized by employing in-pixel transistors as a part of the column comparator. A correlated double sampling (CDS) control transistor is introduced to remove fixed pattern noise (FPN) due to transistor threshold voltage variations. Energy/power scalability is achieved through reconfiguring the spatial resolution of the imager. The photodiode in the proposed pixel can be used as an energy harvesting device to scavenge energy from the ambient light after photo-sensing. The proposed 64 × 66 imager is designed with AMIS CMOS digital process, and operates at a supply voltage of 1.2V. It can achieve a dynamic range of 108.6dB with an energy efficiency of 10.74nJ/pixel/frame in simulation. A comparison with other reported designs reveals that the proposed imager is one of the most energy efficient imagers of wide dynamic range. Moreover, the energy harvesting capability of the proposed imager could lead to further improved energy efficiency.
UR - http://www.scopus.com/inward/record.url?scp=77956509706&partnerID=8YFLogxK
U2 - 10.1109/ASQED.2010.5548240
DO - 10.1109/ASQED.2010.5548240
M3 - Conference contribution
AN - SCOPUS:77956509706
SN - 9781424478088
T3 - Proceedings of the 2nd Asia Symposium on Quality Electronic Design, ASQED 2010
SP - 208
EP - 211
BT - Proceedings of the 2nd Asia Symposium on Quality Electronic Design, ASQED 2010
T2 - 2nd Asia Symposium on Quality Electronic Design, ASQED 2010
Y2 - 3 August 2010 through 4 August 2010
ER -