An integrating CMOS APS for X-ray imaging with an in-pixel preamplifier

Abdalla, Munir AMittuniversitetet,Institutionen för informationsteknologi och medier (-2013) (författare)

QC 20100525
2nd International Workshop on Radiation Imaging Detectors, Jul 02-06, 2000, Freiburg, Germany
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.

TEKNIK OCH TEKNOLOGIER Elektroteknik och elektronik hsv//swe
ENGINEERING AND TECHNOLOGY Electrical Engineering, Electronic Engineering, Information Engineering hsv//eng
X-ray imaging
pixel detectors
readout electronics
CMOS APS
radiation imaging
photodiode
integrating pixel
Electrical engineering, electronics and photonics

Fröjdh, Christer,1952-Mittuniversitetet,Institutionen för informationsteknologi och medier (-2013)(Swepub:miun)chrfro (författare)
Petersson, C. StureMittuniversitetet,KTH,Mikroelektronik och informationsteknik, IMIT,Institutionen för informationsteknologi och medier (-2013)(Swepub:miun)stupet (författare)
MittuniversitetetInstitutionen för informationsteknologi och medier (-2013) (creator_code:org_t)

Ingår i:Nuclear Instruments and Methods in Physics Research Section A466:1, s. 232-2360168-90021872-9576

Av författaren/redakt...: Abdalla, Munir A; Fröjdh, Christer ...; Petersson, C. St ...

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