IV转换电路课设---本文章只为学习用途,未经同意不得用作其他用途------文丽君_new详解.doc

编号： 基础工程设计说明书 I/V转换电路设计 电子工程与自动化学院 光电信息科学与工程 讲师 题 目： 院 （系）： 专 业： 学生姓名： 学 号： 指导教师： 职 称： 2015年 9 月18日摘 要 本课题目的为采用LM358集成运算放大器设计并实现一个将4~20mA的输入直流电流转换为0~10V的输出直流电压的电流/电压（I/V）转换电路，误差控制在5%以内。设计方法为通过伏安法产生毫伏电压，使用同相比例运放电路放大电压，加反相比例电路抵消得零伏电压。本文利用上述设计方法设计了I/V转换电路，并对电路的分析，元器件的选择以及电路参数的计算都做了详细的介绍，经试验，设计方法得证，目的部分达到即输入微电流，输出放大电压，电压随电流有曲线变化，但输出电压出现跳变，实验结果误差很大。 关键词：同相比例放大；电流转电压；反相比例抵消；LM358集成放大器 Abstract This purpose of this article is the integrated operational amplifier of LM358 was designed and implemented an I/V converting circuit of converts the input current of 4~20mA to 0~10V voltage, error control within 5%. This circuit voltage by voltammeters in phase feedback amplifier ,and reverse phase offset 0V.In this paper , using the design method designed the I/V transformation circuit, the analysis of the circuit ,the selection of components and circuit parameter calculation are made detailed introduction. Design method is proved achieve some goal：Input litter current, output amplification voltage .Give the relative curve with the different scan voltage and current, but sometimes the output voltage in great changes, the result of the experiment error is very large. Key words: Noninverting input scaling circuit；current-voltage converter(I/V)；inverting scaling circuit offset；LM358 integrated amplifier. 目 录 摘要 ABSTRACT 引言 ························································4 系统方案论证 ··············································4 简单变阻器实现I/V转换 ··································4 LM358运算放大实现I/V转换 ·······························4 OP07运算放大I/V转换电路 ································5 系统组成及分析 ············································6 同相比例放大电路 ······································· 6 反相比例放大电路 ·······································7 其他单元电路 ·········································7 硬件设计及参数计算 ········································8 运放LM358 ·············································8 其他元件设