BAND-PASS FILTER CIRCUIT DESIGN FOR MULTI-FREQUENCY ELECTRICAL IMPEDACE TOMOGRAPHY SYSTEM. Electrical Impedance Tomography (EIT) is one of the emerging imaging technologies recently. The principle of EIT system is inject electric current into impedance object and measure the voltage based on the electrodes array. The current source that precise, stable, and wide-bandwidth is required to obtain voltage measurements accurately. The current source used for this EIT system is Voltage-Controlled Current Source (VCCS). The VCCS block circuit consists of several circuits, one of them is a filter circuit. The suitable filter for multi-frequency EIT system is band-pass filter. This research has been designed and fabricated a band-pass filter with cut-off frequency 1 and 250 kHz, which is using Butterworth coefficient, unity gain, and Sallen-Key topology.

V. Sarode, P. M. Chimurkar, and A. N. Cheeran, “ELECTRICAL IMPEDANCE TOMOGRAPHY (EIT) BASED MEDICAL IMAGING USING FINITE ELEMENT METHOD (FEM),” Int. J. Eng. Sci. Emerg. Technol., vol. 1, no. 2, pp. 83–89, Feb. 2012.

Z. Shuai, X. Guizhi, G. Duyan, and Y. Weili, “Multi-frequency EIT Hardware System Based on DSP,” Eng. Med. Biol. Soc. 2006 EMBS 06 28th Annu. Int. Conf. IEEE, vol. Supplement, pp. 6677–6680, 2006.

M. Khalighi, B. V. Vahdat, M. Mortazavi, and M. Mikaeili, “Design and Implementation of Precise Hardware For Electrical Impedance Tomography (EIT),” IJST Trans. Electr. Eng., vol. 38, no. E1, pp. 1–20, 2014.

T. R. Qureshi, C. R. Chatwin, and W. Wang, “Design of Wideband Voltage Source Having Low Output Impedance, Flexible Gain and Controllable Feedback Current for EIT Systems,” 2012 2nd Int. Conf. Biomed. Eng. Technol., vol. 34, pp. 45–50, 2012.

Z. Li, Z. Xu, C. Ren, W. Wang, D. Zhao, and H. Zhang, “Study of Voltage Control Current Source in Electrical Impedance Tomography System,” 2010 4th Int. Conf. Bioinforma. Biomed. Eng. ICBBE, pp. 1–4, 2010.

S. M. M. Islam, M. A. R. Reza, and M. A. Kiber, “Performances of Multi-Frequency Voltage to Current Coverters for Bioimpedance

D. L. Terrell, Op Amps: Design, Applications, and Troubleshooting. Newnes, 1996.

R. Mancini, Op Amps For Everyone. Texas: Texas Instruments Incorporated, 2002.