Title :
An In-Pixel Current-Mode Amplifier for Computed Tomography
Author :
Steadman, Roger ; Vogtmeier, Gereon ; Kemna, Armin ; Quossai, Salah Eddine Ibnou ; Hosticka, Bedrich J.
Author_Institution :
Philips Res. Lab., Aachen
Abstract :
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 pArms 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
Keywords :
CMOS image sensors; amplifiers; computerised tomography; current mirrors; current-mode circuits; photodiodes; 17 bit; CMOS standard process; computed tomography; current-mode detector; image sensor; in-pixel current-mode amplifier; monolithic integrated circuit; photodiode; regulated current-mirror structure; Bandwidth; Circuit noise; Computed tomography; Dynamic range; Image converters; Linearity; Mirrors; Optical amplifiers; Photodiodes; X-ray imaging; CMOS; X-ray; computed tomography (CT); image sensor; monolithic integrated circuit; photodiodes;
Journal_Title :
Sensors Journal, IEEE
DOI :
10.1109/JSEN.2006.884450
