Title :
A design of programmable wide bandwidth current source for an impedance tomography system
Author :
Wang, W. ; Cheng, Z. ; McCormick, M.
Author_Institution :
Dept. of Electron. & Electr. Eng., De Montfort Univ., Leicester, UK
fDate :
31 Oct-3 Nov 1996
Abstract :
We have developed a wide frequency bandwidth current source based on phase-locked-loop (PLL) technique for an electrical impedance tomography spectroscopy (EITS) system up to 4 MHz in which the frequency range and gaps between frequencies can be easily programmed. This design is particularly useful in a clinical investigation where the multi-frequency covers a wide range with selectable intervals. The current design of frequency range is between 500 Hz to 4 MHz. The minimum frequency interval between any two frequencies is 6.25% of the frequencies
Keywords :
biomedical electronics; biomedical equipment; electric impedance imaging; frequency synthesizers; phase locked loops; phase locked oscillators; voltage-controlled oscillators; 500 Hz to 4 MHz; electrical impedance tomography system; frequency synthesiser; impedance tomography spectroscopy system; minimum frequency interval; phase-locked-loop technique; programmable wide bandwidth current source; voltage-current converter; walking ring counter; Bandwidth; Counting circuits; Frequency conversion; Frequency synthesizers; Impedance; Legged locomotion; Phase locked loops; Tomography; Voltage; Voltage-controlled oscillators;
Conference_Titel :
Engineering in Medicine and Biology Society, 1996. Bridging Disciplines for Biomedicine. Proceedings of the 18th Annual International Conference of the IEEE
Conference_Location :
Amsterdam
Print_ISBN :
0-7803-3811-1
DOI :
10.1109/IEMBS.1996.651983
