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.
Full text not available from this repository.Abstract
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) |
|---|---|
| Funders: | UNSPECIFIED |
| 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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