Title :
Study of Voltage Control Current Source in Electrical Impedance Tomography System
Author :
Li Zhangyong ; Xu Zhui ; Ren Chaoshi ; Wang Wei ; Zhao Dechun ; Zhang Huiquan
Author_Institution :
Biomed. Eng. Res. Center, Chongqing Univ. of Posts & Telecommun., Chongqing, China
Abstract :
A steady and efficient Voltage Control Current Source (VCCS ) with broad bandwidth plays a very important role in the quality of final images for Electrical Impedance Tomography (EIT) system. Therefore, two models of current source are proposed in the paper: Advanced Howland VCCS and Double Operational Amplifiers VCCS. Both of the two models are simulated through a software named Multisim, and the results of simulation show that both models can keep an output impedance higher than 1M Ω when the frequency changes from 10 kHz to 1 MHz and the load varies from 100 Ω to 1000 Ω .The results also show that both models meet the requirements of VCCS in EIT system, they are hoped to provide usefull approaches for the design of practical VCCS of EIT system.
Keywords :
active networks; biomedical electronics; biomedical imaging; electric impedance imaging; operational amplifiers; Howland VCCS; Multisim software; double operational amplifiers; electrical impedance tomography system; frequency 10 kHz to 1 MHz; resistance 100 ohm to 1000 ohm; voltage control current source; Biological system modeling; Biomedical engineering; Biomedical measurements; Feedback circuits; Humans; Impedance; Operational amplifiers; Tomography; Voltage control; Voltage measurement;
Conference_Titel :
Bioinformatics and Biomedical Engineering (iCBBE), 2010 4th International Conference on
Conference_Location :
Chengdu
Print_ISBN :
978-1-4244-4712-1
Electronic_ISBN :
2151-7614
DOI :
10.1109/ICBBE.2010.5515066
