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An integrating CMOS...
An integrating CMOS APS for X-ray imaging with an in-pixel preamplifier
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- Abdalla, Munir A (author)
- Mittuniversitetet,Institutionen för informationsteknologi och medier (-2013)
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- Fröjdh, Christer, 1952- (author)
- Mittuniversitetet,Institutionen för informationsteknologi och medier (-2013)
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- Petersson, C. Sture (author)
- Mittuniversitetet,KTH,Mikroelektronik och informationsteknik, IMIT,Institutionen för informationsteknologi och medier (-2013)
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(creator_code:org_t)
- 2001
- 2001
- English.
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In: Nuclear Instruments and Methods in Physics Research Section A. - 0168-9002 .- 1872-9576. ; 466:1, s. 232-236
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Abstract
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- We present in this paper an integrating CMOS Active Pixel Sensor (APS) circuit coated with scintillator type sensors for intra-oral dental X-ray imaging systems. The photosensing element in the pixel is formed by the p-diffusion on the n-well diode. The advantage of this photosensor is its very low direct absorption of X-rays compared to the other available photosensing elements in the CMOS pixel. The pixel features an integrating capacitor in the feedback loop of a preamplifier of a finite gain in order to increase the optical sensitivity. To verify the effectiveness of this in-pixel preamplification, a prototype 32 x 80 element CMOS active pixel array was implemented in a 0.8 mum CMOS double poly, n-well process with a pixel pitch of 50 mum. Measured results confirmed the improved optical sensitivity performance of the APS. Various measurements on device performance are presented.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)
Keyword
- X-ray imaging
- pixel detectors
- readout electronics
- CMOS APS
- radiation imaging
- photodiode
- integrating pixel
- Electrical engineering, electronics and photonics
Publication and Content Type
- ref (subject category)
- art (subject category)
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