Wide Band frequency fixed current source for BIT and BIA

Ar-Rawi, A.H. and Moghavvemi, M. and Wan-Ibrahim, W.M.A. (2009) Wide Band frequency fixed current source for BIT and BIA. In: World Congress on Medical Physics and Biomedical Engineering,Diagnostic Imaging , 7 -12 September 2009, Munich, Germany.

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High frequency bioelectrical impedance analysis devices are mostly used in Bioimpedance tomography and blood analysis. Nowadays 50 - 100 KHz bioelectrical impedance devices are commonly used for body composition analysis. AD8130 or AD 8129 deferential op-amp is used in this paper. These two op-amps offer high output impedances at low frequencies because of the amplifiers' good low-frequency CMRR (common-mode-rejection ratios). At higher frequencies, decreasing CMRR, inherent output capacitances, and slew-rate limitations prevent realization of high-quality current sources. 170 mV sine wave signal is used as input voltage considering the current should be no more than 1 mA. Four frequencies of 100 KHz, 1 MHz, 2 MHz and 3.2 MHz are applied to the circuit and by changing the load resistor, the current is measured. The result shows the current stable during the load resistor changing.

Item Type: Conference or Workshop Item (Paper)
Additional Information: Volume 25 Issue 2 ISSN: 16800737 ISBN: 978-364203878 DOI: 10.1007/978-3-642-03879-2-146
Uncontrolled Keywords: Bio-impedance; Bioelectrical impedance; Bioelectrical impedance analysis; Blood analysis; Body composition analysis; Common-mode rejection ratios; Commonly used; Current sources; Fixed current; High frequency; High output; High quality; Higher frequencies; Input voltages; Load resistors; Low frequency; Sine-wave signals; Slew-rate; Wide band frequencies
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Engineering
Depositing User: Ms. Norhamizah Tamizi
Date Deposited: 27 Mar 2014 02:18
Last Modified: 23 Nov 2017 02:15
URI: http://eprints.um.edu.my/id/eprint/9745

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