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A high dynamic range, high linearity CMOS current-mode image sensor for computed tomography

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


Fesquet, L.:
ESSCIRC 2005, 31st European Solid-State Circuits Conference. Proceedings
Piscataway, NJ: IEEE Operations Center, 2005
ISBN: 0-7803-9205-1
European Solid State Circuits Conference (ESSCIRC) <31, 2005, Grenoble>
Fraunhofer IMS ()
image sensor; computed tomography; high dynamic range; current mode detector; Detektor; Computer-Tomographie; CMOS; Photodiode

In this work we show a high dynamic range current-mode detector for computer tomography applications. A regulated current mirror structure has been implemented at pixel level that provides with 17 bits dynamic range and a noise floor below 3 pA[RMS]. Non-linearity is kept below 2% and signal bandwidth is higher than 10 kHz. A test structure with 4x4 pixel array is presented in this paper. Both photodiode and current mode amplifier have been integrated into the same CMOS standard process.