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A 3-TFT hybrid active-passive pixel with correlated double sampling CMOS readout circuit for real-time medical x-ray imaging

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4 Author(s)
N. Safavian ; Electrical and Computer Engineering Department, University of Waterloo, Ontario, N2L3G1, Canada ; K. S. Karim ; A. Nathan ; J. A. Rowlands

This paper presents a new hybrid current-programmed, current-output active pixel sensor (APS) suitable for real time X-ray imaging (fluoroscopy) and an off-panel CMOS readout circuit. The pixel circuit is designed using hydrogenated amorphous silicon (a-Si:H) thin film transistor (TFT) technology. Measurements show that the proposed pixel circuit can successfully compensate for characteristic variations (e.g. mobility and threshold voltage shift) in a-Si:H TFTs under prolonged gate voltage stress. The readout circuit exploits correlated double sampling (CDS) technique to reduce the offset current, low frequency noise and fixed-pattern noise (FPN) on the array operation. Measurements show less than 5% change in the output current of the APS for 3 V shift in the threshold voltage.

Published in:

Solid-State Circuits Conference, 2008. ESSCIRC 2008. 34th European

Date of Conference:

15-19 Sept. 2008