Journal article

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

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Author list: Abdalla, Munir A;Fröjdh, Christer;Petersson, Sture

Publication year: 2001

Start page: 232

End page: 236

Number of pages: 5

ISSN: 0168-9002

DOI: http://dx.doi.org/10.1016/S0168-9002(01)00850-6

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Abstract

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.


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