1 December 2007 Characterization studies of two novel active pixel sensors
Author Affiliations +
Optical Engineering, 46(12), 124003 (2007). doi:10.1117/1.2818224
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.
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, "Characterization studies of two novel active pixel sensors," Optical Engineering 46(12), 124003 (1 December 2007). http://dx.doi.org/10.1117/1.2818224
JOURNAL ARTICLE
11 PAGES


SHARE
KEYWORDS
Sensors

CMOS sensors

Scintillators

X-rays

Active sensors

Image segmentation

Image sensors

RELATED CONTENT

Use Of The OTF In The Cost Performance Evaluation Of...
Proceedings of SPIE (June 01 1974)
ASTRO-H Soft X-ray Telescope (SXT)
Proceedings of SPIE (September 30 2011)
Proposal for a source size and source position monitor for...
Proceedings of SPIE (September 17 2014)
Imager onboard INTEGRAL
Proceedings of SPIE (October 18 1996)

Back to Top