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Optical Engineering

Characterization studies of two novel active pixel sensors
Author(s): Sarah E. Bohndiek; Costas D. Arvanitis; Gary J. Royle; Robert D. Speller; Andy Clark; Jamie Crooks; Mark Lyndon Prydderch; Renato A. D. Turchetta; Andrew Blue; Val O'Shea
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Paper Abstract

A United Kingdom consortium (MI3) is founded to develop advanced CMOS image sensors for scientific applications. "Vanilla," a 520×520 array of active pixels with 25-μm pitch is fabricated in the 0.35-μm 4M2P (4 metal, 2 poly) CMOS process and uses a 3.3-V supply. It has flushed reset circuitry to attain low reset noise and random pixel access for high-speed region-of-interest (ROI) readout. "OPIC" is a 64×72 test structure array of digital pixels with 30-µm pitch, fabricated in 0.25-μm 5M1P (5 metal 1 poly) CMOS process with a 3.3/2.5-V supply. It can perform thresholding via an in-pixel comparator for sparse readout at a high frame rate. Characterization of both sensors is performed under optical illumination and x-ray exposure. For x-ray characterization, both sensors were coupled to a structured thallium-doped cesium iodide (CsI:Tl) scintillator via a fiber optic plate. Vanilla has been found to exhibit 34±3e-; read noise and a spectral response of 225±5 mA/W at 500 nm and can read a 6×6 ROI at 24,395 frames/s. OPIC has 46±3e-; read noise and can perform sparse readout at up to 3700 frames/s. Based on these results, Vanilla could be employed for applications where only a small portion of the image contains relevant information, while OPIC is suited to high-speed imaging applications.

Paper Details

Date Published: 1 December 2007
PDF: 11 pages
Opt. Eng. 46(12) 124003 doi: 10.1117/1.2818224
Published in: Optical Engineering Volume 46, Issue 12
Show Author Affiliations
Sarah E. Bohndiek, Univ. College London (United Kingdom)
Costas D. Arvanitis, Univ. College London (United Kingdom)
Gary J. Royle, Univ. College London (United Kingdom)
Robert D. Speller, Univ. College London (United Kingdom)
Andy Clark, Science and Technology Facilities Council (United Kingdom)
Jamie Crooks, Science and Technology Facilities Council (United Kingdom)
Mark Lyndon Prydderch, Science and Technology Facilities Council (United Kingdom)
Renato A. D. Turchetta, Science and Technology Facilities Council (United Kingdom)
Andrew Blue, Univ. of Glasgow (United Kingdom)
Val O'Shea, Univ. of Glasgow (United Kingdom)


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