FPGA Based Excitation Source in Biomedical Electrical Impedance Tomography System
An excitation source for biomedical electrical impedance tomography system based on FPGA is designed and implemented with 33 KHz bandwidth and adjustable phases. Codes are programmed with PicoBlaze instructions by Notepad++, and compiled to user programs by KCPSM3 assembler. Digital-analog conversion is carried out in interruption subroutine, the output digital signals are sampled at the setting frequency and filtered by a second-order Butterworth low-pass filter. The proposed method offers a novel effective and feasible approach to satisfy the requirements of excitation source in bioelectrical impedance tomography system.
X. Y. Chen and J. N. Wu, "FPGA Based Excitation Source in Biomedical Electrical Impedance Tomography System", Applied Mechanics and Materials, Vols. 48-49, pp. 537-540, 2011