A FPGA-based sweep-frequency voltage source for EIT system

2010 International Conference on Electronics and Information Engineering Pub Date : 2010-09-02 DOI:10.1109/ICEIE.2010.5559778

Dechun Zhao, C. Ren, H. Sha, Zhangyong Li, Wei Wang

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引用次数: 2

Abstract

A FPGA-based sweep-frequency voltage source for EIT is designed in this paper. There are three methods for generating sine signal for EIT, including the special function generator, the general purpose chip, and the ordinary oscillator circuit. The special function generator has some inherent characteristics of wide-band frequency and stable output. But the range of frequency is so broad that it is difficult to be changed into suitable output signal for acquiring the tissue characteristic in a very narrow band. The oscillator circuit possesses simple structure and low cost, but with the fatal flaw of an unstable output signal and a lot of inconvenience for adjusting frequency. The general purpose chip such as field programmable gate array is an excellent product in stability and adjustability for sweep-frequency EIT system. In EIT system, the range of frequency is between 1 KHz and 1 MHz. And in order to ensure the phase resolution and the up-limit frequency, a new method to expand the frequency was introduced. Then, a sweep-frequency digital voltage source was designed with the new method to acquire a broad-band output. Finally, it analyzed the frequency spectrum of output signal.

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一种基于fpga的EIT系统扫频电压源

本文设计了一种基于fpga的扫描频率电压源。产生EIT正弦信号的方法有三种:专用函数发生器、通用芯片和普通振荡器电路。该特殊函数发生器具有宽带频率和稳定输出的固有特性。但频率范围太宽，很难在很窄的频带内转换成合适的输出信号来获取组织特性。该振荡器电路结构简单，成本低，但存在输出信号不稳定和调频不方便的致命缺陷。现场可编程门阵列等通用芯片是扫频EIT系统稳定性和可调性较好的产品。在EIT系统中，频率范围在1khz到1mhz之间。为了保证相位分辨率和上限频率，提出了一种新的扩频方法。然后，利用该方法设计了一种扫描频率数字电压源，以获得宽带输出。最后，对输出信号的频谱进行了分析。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2010 International Conference on Electronics and Information Engineering

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