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A high dynamic range current-mode amplifier for computed tomography

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5 Author(s)
R. Steadman ; Philips Res. Lab., Aachen, Germany ; G. Vogtmeier ; A. Kemna ; S. E. I. Quossai
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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 4times4 pixel array is presented is this paper. Both photodiode and current mode amplifier have been integrated into the same CMOS standard process

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IEEE Journal of Solid-State Circuits  (Volume:41 ,  Issue: 7 )