BJT参数测试仪中数控微电流源研究与实现  

Research and Realization of NC Micro-current Source in BJT Parametric Test System

作　　者：梁文海[1] 

机构地区：[1]四川师范大学物理与电子工程学院,四川成都610068

出　　处：《现代电子技术》2008年第14期18-20,24,共4页Modern Electronics Technique

摘　　要：对BJT参数测试仪中数控微电流源进行研究与设计。系统采用Howland电流泵构成高精度V/I转换器,V/I转换器输入为数/模转换器的输出电压,微控制器通过改变输入数/模转换器的数字量实现对电流源输出电流控制。对数控微电流源的工作原理做了定性和定量分析,并通过实验验证设计的正确性。该数控微电流源通过双电阻反馈网络构成闭环控制系统,其输出电流精度高、稳定性好,具有良好的负载特性。The NC micro- current source of BJT parametric test system is researched and designed. The system consists of a high- precision V/I converters based on Howland current pump,and the D/A output and the V/I input is connected,Therefore the MCU can control the current- sources＇ output by adjusting D/A data. Qualitative and the quantitative analysis to the NC micro - current source＇s principle are made,and the design accuracy through the experiment is confirmed. The NC micro - current source constituted the closed- loop control system through the double resistance feedback network. Therefore,its output current precision is higher, the stability is good,and has good load characteristics.

关 键 词：BJT 微控制器 数控微电流源 闭环控制 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]