晶体三极管特性曲线测试仪设计..doc

PAGE PAGE III 晶体三极管特性曲线测试仪设计 摘 要 晶体管特性曲线测试仪广泛用于科研，实验教学和工业中，论文选题具有实际意义。本文在学习和查阅相关文件的基础上，介绍了实现一个简易晶体管伏安特性曲线测试仪基本原理和实现方案。 在系统硬件设计中，以MCS-51单片机最小系统为核心，扩展了人机对话接口、A/D转换接口；采用555振荡器实现了方波和三角波的输出信号，利用计数器74161和DAC0832产生梯形波，通过比较器LM311构成识别晶体管类型的判断。 系统的软件设计是在Keil51的平台上，使用C语言与汇编语言混合编程编写了系统应用软件；包括主程序模块、显示模块、数据采集模块和数据处理模块。 关键词：晶体管图示仪； 伏安特性； 单片机 Crystal three transistor characteristic cure tester ABSTRACT：Transistor curve tracers used in research, teaching and industrial experiments, the practical significance of topics. In this paper, learning and access to relevant documents, based on the realization of a simple transistor introduced voltammetric curve tracers basic theory and programs. In the system hardware design to MCS-51 microcomputer as the core, extending the man-machine dialogue interfaces, A / D conversion interface; Achieved by 555 square wave oscillator and triangle wave output signal, generated using counters 74161 and DAC0832 trapezoidal wave, Constitute recognition by the comparator LM311 transistor type judgments. The software design is the platform Keil51 using C language and assembly language programming prepared hybrid system application software; Including the main program module, display module, data acquisition module and data processing module KEY WORDS: Transistor Tracer , Volt-ampere characteristics, Single slice of machine 目录 TOC \o 1-3 \h \z \u HYPERLINK \l _Toc326568694 第1章 前 言 PAGEREF _Toc326568694 \h 1 HYPERLINK \l _Toc326568695 1.1 设计的背景及意义 PAGEREF _Toc326568695 \h 1 HYPERLINK \l _Toc326568696 1.2 晶体管及晶体管特性曲线测试仪历史及研究现状 PAGEREF _Toc326568696 \h 1 HYPERLINK \l _Toc326568697 第2章 晶体管特性曲线测试仪的系统设计 PAGEREF _Toc326568697 \h 3 HYPERLINK \l _Toc326568698 2.1 晶体三极管原理及工作状态分析 PAGEREF _Toc326568698 \h 3 HYPERLINK \l _Toc326568699 2.2 系统整体框图设计 PAGEREF _Toc326568699 \h 4 HYPERLINK \l _Toc326568700 2.3 各模块方案设计与选择 PAGEREF _Toc326568700 \h 5 HYPERLINK \l _Toc326568701 2.3.1 555振荡器方波和阶梯波发生模块 PAGEREF _Toc326568701 \h 5 HYPERLINK \l _Toc326568702 2.3.