Title :
A near-infrared non-invasive imager using correlated double sampling
Author :
Wong, Alex ; Gangavarapu, Kiran ; Newcomer, Mitch ; Chance, Britton
Author_Institution :
Dept. of Electron. Eng., Chinese Univ. of Hong Kong, Shatin
Abstract :
In this paper, a NIR non-invasive imager prototype using discrete components (all CMOS integrated circuits) was built which incorporates correlated double sampling (CDS) technique. Low frequency noise and offsets of amplifiers are removed by subtracting it from signal through CDS. The imager is comprised of a current-to-voltage preamp (I-V), post-gain amplifier and the CDS system, which consists of several sample & hold and subtracter circuits. The system is being used to quantify the change of oxy- and deoxy-hemoglobin. The circuit operates at 3 V. The I-V has achieved an output dynamic range of 58 dB. Later on, a transmitter will be included and the entire system will be integrated into an IC
Keywords :
CMOS integrated circuits; biomedical optical imaging; infrared imaging; molecular biophysics; preamplifiers; proteins; 3 V; CMOS integrated circuits; correlated double sampling; current-to-voltage preamp; deoxyhemoglobin; low frequency noise; near-infrared noninvasive imager; oxyhemoglobin; post-gain amplifier; sample & hold circuits; subtracter circuits; Band pass filters; Detectors; Image sampling; Light emitting diodes; Low-frequency noise; Magnetic resonance imaging; Photodiodes; Photonic integrated circuits; Positron emission tomography; Switches; CDS; NIR; correlated double sampling; non-invasive technique;
Conference_Titel :
Computer Architectures for Machine Perception, 2003 IEEE International Workshop on
Conference_Location :
Hong Kong
Print_ISBN :
0-7803-8612-4
DOI :
10.1109/ISSMD.2004.1689557
