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A novel hybrid active-passive pixel with correlated double sampling CMOS readout circuit for medical x-ray imaging

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4 Author(s)
N. Safavian ; Electrical and Computer Engineering Department, University of Waterloo, Ontario, N2L3G1, Canada ; G. R. Chaji ; K. S. Karim ; 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. The simulation results based on the measured characteristics of a- Si:H TFTs 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.

Published in:

2008 IEEE International Symposium on Circuits and Systems

Date of Conference:

18-21 May 2008