Feasibility of current mediated amorphous silicon active pixel sensor readout circuits for large area diagnostic medical imaging

K. S. Karim

doi:10.1117/12.2283926

29 August 2017 Feasibility of current mediated amorphous silicon active pixel sensor readout circuits for large area diagnostic medical imaging

K. S. Karim

Author Affiliations +

Proceedings Volume 10313, Opto-Canada: SPIE Regional Meeting on Optoelectronics, Photonics, and Imaging; 103133M (2017) https://doi.org/10.1117/12.2283926
Event: Opto-Canada: SPIE Regional Meeting on Optoelectronics, Photonics, and Imaging, 2002, Ottawa, Ontario, Canada

Abstract

The most widely used architecture in large area amorphous silicon (a-Si) flat panel imagers is a passive pixel sensor (PPS), which consists of a detector and a readout switch. While the PPS has the advantage of being compact and amenable towards high-resolution imaging, reading small PPS output signals requires external circuitry such as column charge amplifiers that produce additional noise and reduce the minimum readable sensor input signal. This work presents a current mode amorphous silicon active pixel that performs on-pixel amplification of noise-vulnerable sensor input signals to minimize the effect of external readout noise sources associated with "off-chip" charge amplifiers. Preliminary results [1] indicate excellent small signal linearity along with a high, and programmable, charge gain, which is promising for diagnostic medical imaging. This work examines low frequency a-Si TFT thermal and flicker noise, which contribute to the overall noise performance of the APS.

Citation Download Citation

K. S. Karim "Feasibility of current mediated amorphous silicon active pixel sensor readout circuits for large area diagnostic medical imaging", Proc. SPIE 10313, Opto-Canada: SPIE Regional Meeting on Optoelectronics, Photonics, and Imaging, 103133M (29 August 2017); https://doi.org/10.1117/12.2283926

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