【摘要】 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。更多还原

【Abstract】 This paper designs a multi-frequency current source for electrical impendance tomography system based on the microcon-troller and the AD7008. 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.更多还原