基于Howland电流源的精密压控电流源  

Precision voltage controlled current source based on Howland

作　　者：陈笑风[1] 杜磊[1] 赵柏树[1] 

机构地区：[1]湖北大学物理学与电子技术学院,湖北武汉430062

出　　处：《电子技术应用》2012年第9期71-74,共4页Application of Electronic Technique

摘　　要：设计一种基于Howland电流源电路的精密压控电流源,论述了该精密压控电流源的原理。该电路以V/I转换电路作为核心,Howland电流源做为误差补偿电路,进一步提高了电流源的精度,使绝对误差仿真值达到nA级,实际电路测量值绝对误差达到μA级,得到高精度的压控电流源。仿真和实验测试均证明该方案是可行的。Based on the Howland current source circuit, this article designs one kind of the high precision voltage controlled current source and discusses the principle of it. Using the V/I conversion circuit as the core of the design circuit and Howland current source circuit as error compensation circuit, this circuit can get the high precision voltage controlled current source, which further improves the accuracy of current sources. The absolute error value of simulation can reach a nA level and the actual circuit reaches an μA level. The simulation and the experiment test prove this plan is feasible.

关 键 词：Howland电流源 正反馈 压控电流源 MULTISIM 

分 类 号：TM919[电气工程—电力电子与电力传动] TN710[电子电信—电路与系统]