By Topic

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

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

4 Author(s)
Safavian, N. ; Electr. & Comput. Eng. Dept., Univ. of Waterloo, Waterloo, ON ; Karim, K.S. ; Nathan, A. ; Rowlands, J.A.

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