一种线性负反馈可编程电流源的设计  

A Programmable Current Source Using Linear Negative Feedback

作　　者：黄剑平[1] 沈汉鑫[1] 

机构地区：[1]厦门理工学院光电与通信工程学院,福建厦门361024

出　　处：《厦门理工学院学报》2015年第1期67-72,共6页Journal of Xiamen University of Technology

基　　金：福建省科技厅科研计划项目(2012J01238);福建省教育厅科技项目(JA11231);厦门理工学院教改项目(JGQ201210)

摘　　要：设计了采用线性负反馈结构的可编程电流源,并详细阐述电路的工作原理、设计思路和具体电路参数的计算过程.充分利用各关键元器件的精密、稳定、低噪声、低温漂等良好特性,实现对输出电流的精确控制,输出电流范围为0~1.024 A.该电路在反馈部分采用精密运算放大器对取样电阻的电压进行精准放大,增加系统设计上的灵活性.测试结果表明,该电路性能稳定可靠,电流的输出线性度良好,输出电流误差小,负载调整率低.A programmable current source using linear negative feedback structure was designed with detailed description of working principle of the circuit, thoughts of the designer and process of the parameters calculation. The circuit is able to give a precise control of the output current owing to precision, stability; low noise and low temperature drift of the key components and its output current ranges from 0 to 1. 024 A. The feedback has an innovative design to use precision operation amplifier in amplifying the voltage of sampling resistor accurately that adds to the flexibility of the circuit. Test result shows that the circuit is stable and reliable with good linear output, low error and low load regulation performance.

关 键 词：电流源 运算放大器 电流取样 负反馈 

分 类 号：TN722.77[电子电信—电路与系统]