An In-Pixel Current-Mode Amplifier for Computed Tomography

A high-dynamic-range current-mode detector for a computed-tomography application is shown. A regulated current-mirror structure that provides a 17-bit dynamic range and a noise floor below 3 pA rms has been implemented at pixel level. Nonlinearity is kept below 2%, and the signal bandwidth is higher...

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Bibliographic Details
Published in:IEEE sensors journal 2006-12, Vol.6 (6), p.1372-1373
Main Authors: Steadman, R., Vogtmeier, G., Kemna, A., Quossai, S.E.I., Hosticka, B.J.
Format: Article
Language:English
Subjects:
Bandwidth
Circuit noise
CMOS
Computed tomography
computed tomography (CT)
Dynamic range
Image converters
image sensor
Linearity
Mirrors
monolithic integrated circuit
Optical amplifiers
Photodiodes
X-ray
X-ray imaging
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Summary:A high-dynamic-range current-mode detector for a computed-tomography application is shown. A regulated current-mirror structure that provides a 17-bit dynamic range and a noise floor below 3 pA rms has been implemented at pixel level. Nonlinearity is kept below 2%, and the signal bandwidth is higher than 10 kHz. A test structure with a 4 times 4 pixel array is presented in this paper. Both the photodiode and the current-mode amplifier have been integrated into the same CMOS standard process
ISSN:1530-437X
1558-1748
DOI:10.1109/JSEN.2006.884450