电阻抗成像系统中的多频恒流源设计

Design of Multi-frequency Current Source for Electrical Impendance Tomography System

设计了一种基于单片机与AD7008的应用于电阻抗成像系统中的多频恒流源,给出了恒流源的系统组成结构、硬件电路设计、程序流程图,并用PSpice软件对椭圆低通滤波器电路和V/I转换(电压转换为电流)电路进行了仿真和优化设计,实验结果表明所设计的多频恒流源满足电阻抗成像系统的要求。

This paper designs a multi-frequency current source for electrical impendance tomography system based on the microcontroller and the ADT008. And then it introduces the system components of the current source, hardware circuit design, process flow chart and simulates and optimizates the ellipse low-pass elliptic filter and voltage to current conversion circuit by the Pspice soft- ware. The experimental result shows the design of multi-frequency current source satisfies the request of electricity impedance tomography system.