基于FPGA的电阻抗成像系统激励信号源  

FPGA Based Signal Generator in EIT System

作　　者：王化祥[1] 崔自强[1] 

机构地区：[1]天津大学自动化学院,天津300072

出　　处：《电子器件》2007年第1期90-92,96,共4页Chinese Journal of Electron Devices

基　　金：国家自然科学基金(60532020;60301008;50337020;60472077);国家高技术研究发展计划专项经费资助(20001AA413210)

摘　　要：针对人体电阻抗成像系统的要求，设计并实现了一种基于FPGA的激励信号源，输出频率范围为0～1．5MHz．通过对正弦波进行泰勒级数插值，使信号源的精度得到改进；其频率、相角及幅值可调；不需改动外部电路，即可工作在单频、多频和扫频模式下．实验结果表明，该信号源精度高，幅值稳定性好，调节方便，可满足不同激励模式下人体电阻抗成像系统的需要．A FPGA based signal generator is designed and implemented. The frequency covers from 0 to 1.5 MHa The precision of the signal generator is improved significantly with Taylor series corrected method. The frequency, phase and amplitude of the signal source can be controlled. Moreover, single frequency, multi-frequency and sweep frequency signals can also be generated without modifying external hardware_. Experimental results show that this signal generator is of high precision and stability, and is an ideal module for electrical impedance tomography system of different exciting modes.

关 键 词：电阻抗断层成像 泰勒级数插值 信号源FPGA 

分 类 号：TP911.73[自动化与计算机技术]