基于Howland电流源的精密压控电流源

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。

Precision voltage controlled current source based on Howland

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.