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An in-pixel current-mode amplifier for computed tomography

: Steadman, R.; Vogtmeier, G.; Kemna, A.; Eddine Ibnou Quossai, S.; Hosticka, B.J.


IEEE Sensors Journal 6 (2006), No.6, pp.1372-1373
ISSN: 1530-437X
Journal Article
Fraunhofer IMS ()

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 x 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.