Title :
The Simulation of Current Generator Design for Multi-Frequency Electrical Impedance Tomograph
Author :
Chen, Cheng-Yu ; Lu, Yi-Yu ; Huang, Wen-Lung ; Cheng, Kuo-Shang
Author_Institution :
Inst. of Biomed. Eng., Nat. Cheng Kung Univ., Tainan
fDate :
Aug. 30 2006-Sept. 3 2006
Abstract :
In the development of new generation EIT systems, the design of a steady current generator with broad bandwidth is an important consideration. In this paper, the current generator is constructed by enhanced Rowland circuit with high-speed operational amplifier. The electronic models of current generator built on Oreadreg PSpice 9.2 software are simulated to observe the output current stability at multi-frequencies. As results, the THS4021 model provides stable output current at the frequency ranging from 10 k to 1 MHz with the load for 200-2 kOmega. Furthermore, it also offers higher output impedance that equal to 2.1 MOmega at 1 MHz. The results of simulations provide useful approaches of current generator design for EIT system
Keywords :
biomedical electronics; biomedical equipment; biomedical imaging; constant current sources; electric impedance imaging; operational amplifiers; 10 kHz to 1 MHz; 2.1 Mohm; 200 ohm to 2 kohm; EIT systems; Oread PSpice 9.2 software; THS4021 model; current generator simulation design; current stability; electronic models; enhanced Rowland circuit; high-speed operational amplifier; multifrequency electrical impedance tomograph; Biomedical imaging; Cities and towns; Conductivity; Electrodes; Feedback circuits; Frequency; Impedance; Operational amplifiers; Tomography; Voltage measurement; Electrical Impedance Tomography (EIT); current generator; current source;
Conference_Titel :
Engineering in Medicine and Biology Society, 2006. EMBS '06. 28th Annual International Conference of the IEEE
Conference_Location :
New York, NY
Print_ISBN :
1-4244-0032-5
Electronic_ISBN :
1557-170X
DOI :
10.1109/IEMBS.2006.259576
