基于FPGA的生物电阻抗成像系统激励源设计与实现  

FPGA Based Excitation Source in Biomedical Electrical Impedance Tomography System

作　　者：陈晓艳[1] 吴佳妮[1] 

机构地区：[1]天津科技大学电子信息与自动化学院,天津300222

出　　处：《微计算机应用》2011年第1期20-25,共6页Microcomputer Applications

基　　金：天津市科委自然科学基金(08JCYBJC03500);天津科技大学人才启动基金(20090411)

摘　　要：设计并实现一种基于FPGA的生物电阻抗断层成像系统的激励源,带宽为33KHz且相位可调。在Notepad++中根据P icoB laze指令系统编写控制代码,经KCPSM3编译生成用户程序,采用中断方式控制数模转换并按设定频率对输出信号进行采样,经巴特沃斯二阶低通滤波输出。结果:仿真与实验结果证明了该方法有效、可行。本文为生物电阻抗断层成像系统激励源的设计实现提供了一种新方法,具有编程量小、开发时间短及出错概率低的优势。Subject：An excitation source for biomedical electrical impedance tomography system based on FPGA is designed and imple- mented with 33 KHz bandwidth and adjustable phases. Method：Codes are programmed by PicoBlaze instructions by Notepad ＋ ＋ , and compiled to user programs by KCPSM3 assembler. Digital - analog conversion is carried out in interruption subroutine, and the output digital signals are sampled at the setting frequency, and filtered by a second - order Butterworth low - pass filter. Results ： the proposed method offer a novel effective and feasible approach to satisfy the requirements of excitation source in bioelectrical impedance tomography system

关 键 词：电阻抗成像系统 激励源 FPGA 巴特沃斯滤波器 

分 类 号：TN791[电子电信—电路与系统]