基于电流传输器的宽频带电流驱动的电阻抗断层成像系统。

Current-conveyor-based wide-band current driver for electrical impedance tomography.

机构信息

Thayer School of Engineering, Dartmouth College, Hanover, NH, United States of America.

出版信息

Physiol Meas. 2019 Apr 3;40(3):034005. doi: 10.1088/1361-6579/ab0c3c.

DOI:10.1088/1361-6579/ab0c3c

PMID:30831568

Abstract

OBJECTIVE

In this paper a wide-band integrated current driver for electrical impedance tomography (EIT) is presented. The application is primarily for prostate and breast cancer detection which require the tissue to be interrogated at frequencies up to 10 MHz while achieving low harmonic distortion and high accuracy.

APPROACH

The current driver is based on current conveyor architecture and can deliver 1.2 mA of peak to peak ac current between frequencies of 100 Hz-10 MHz. It is fabricated in CMOS 0.18 [Formula: see text]m technology with a power supply of 3.3 V, and occupies a core area of 0.26 [Formula: see text].

MAIN RESULTS

The measured harmonic distortion for a peak current of 1.2 mA is <[Formula: see text] for frequencies less than 100 kHz, and increases to [Formula: see text] at 10 MHz. The measured output impedance of the current driver is 101 k[Formula: see text] at 1 MHz and 19.5 k[Formula: see text] at 10 MHz.

SIGNIFICANCE

The circuit is suitable for high frequency active electrode applications.

摘要

目的

本文提出了一种用于电阻抗断层成像（EIT）的宽带集成电流驱动器。该应用主要用于前列腺和乳腺癌检测，需要在 10MHz 以下的频率下对组织进行探测，同时实现低谐波失真和高精度。

方法

电流驱动器基于电流传输器架构，可在 100Hz-10MHz 的频率范围内提供 1.2mA 的峰峰值交流电流。它采用 0.18μm CMOS 工艺制造，电源为 3.3V，核心面积为 0.26mm²。

主要结果

对于 1.2mA 的峰值电流，在低于 100kHz 的频率下，测量的谐波失真小于[Formula: see text]，在 10MHz 时增加到[Formula: see text]。电流驱动器的测量输出阻抗在 1MHz 时为 101k[Formula: see text]，在 10MHz 时为 19.5k[Formula: see text]。