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A high dynamic range current-mode amplifier for computed tomography

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


IEEE journal of solid-state circuits 41 (2006), Nr.7, S.1615-1619
ISSN: 0018-9200
Fraunhofer IMS ()
integrated circuit; image sensor; x-ray; photodiode; computed tomography; monolithic integrated circuit; CMOS; Photodiode; Bildsensor; integrierte Schaltung

In this paper, we show a high dynamic range current-mode detector for computed tomography application. A regulated current mirror structure has been implemented at pixel level that provides with 17 bits dynamic range and a noise floor below 3 pArms. Nonlinearity 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.