Bohndiek, S. E., Arvanitis, C. D., Royle, G. J., Speller, R. D., Clark, A. T., Crooks, J. P., Prydderch, M. L., Turchetta, R., Blue, A. and O'Shea, V. (2007) Characterization studies of two novel active pixel sensors. Optical Engineering, 46(12), p. 124003. (doi: 10.1117/1.2818224)
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Abstract
A United Kingdom consortium (MI3) is founded to develop advanced CMOS image sensors for scientific applications. “Vanilla,” a 520×520520×520 array of active pixels with 25-μm25-μm pitch is fabricated in the 0.35-μm0.35-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 64×7264×72 test structure array of digital pixels with 30-μm30-μm pitch, fabricated in 0.25-μm0.25-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)(CsI:Tl) scintillator via a fiber optic plate. Vanilla has been found to exhibit 34±3e−34±3e− read noise and a spectral response of 225±5mA∕W225±5mA∕W at 500nm500nm and can read a 6×66×6 ROI at 24,395frames∕s24,395frames∕s. OPIC has 46±3e−46±3e− read noise and can perform sparse readout at up to 3700frames∕s3700frames∕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.
Item Type: | Articles |
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Status: | Published |
Refereed: | Yes |
Glasgow Author(s) Enlighten ID: | O'Shea, Professor Val and Blue, Dr Andrew |
Authors: | Bohndiek, S. E., Arvanitis, C. D., Royle, G. J., Speller, R. D., Clark, A. T., Crooks, J. P., Prydderch, M. L., Turchetta, R., Blue, A., and O'Shea, V. |
College/School: | College of Science and Engineering > School of Physics and Astronomy |
Journal Name: | Optical Engineering |
Publisher: | SPIE |
ISSN: | 0091-3286 |
ISSN (Online): | 1560-2303 |
Published Online: | 11 December 2007 |
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