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

fYear

0

fDate

0-0 0

Firstpage

43

Lastpage

46

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Computer Architectures for Machine Perception, 2003 IEEE International Workshop on

Conference_Location

Hong Kong

Print_ISBN

0-7803-8612-4

Type

conf

DOI

10.1109/ISSMD.2004.1689557

Filename

1689557