集成电路与嵌入式系统2026，Vol.26Issue(5)：83-88,6.DOI:10.20193/j.ices2097-4191.2025.0132
一种高精度压控电流源电路的设计与实现
Design and implementation of a high-precision voltage-controlled current source circuit
陈涛 1罗凡 2刘合卫 1李巍1
作者信息
- 1. 中国电子科技集团公司 第五十八研究所,无锡 214035
- 2. 武汉第二船舶设计研究所,武汉 430300
- 折叠
摘要
Abstract
This paper introduces the working principle of a voltage-controlled current source circuit,which is an improved version of the traditional Howland current source circuit.It employs a differential operational amplifier(op-amp)circuit structure to construct a volt-age-to-current conversion circuit.By using an FPGA to control the DAC output to generate different voltages,the circuit achieves cur-rent output ranging from 4 mA to 24 mA.The paper analyzes the impact of factors such as the op-amp,DAC,and resistor network on current output accuracy,providing guidance for component selection and circuit design.A compensation method using linear fitting is proposed,effectively improving current output accuracy.The constant current source circuit built using the SGM8249 operational ampli-fier was tested under temperature conditions ranging from-30℃to 70℃.Within the current output range of 4 mA to 24 mA,the maximum error did not exceed 0.03 mA,and the relative full-scale error was less than 0.15%,meeting the requirement of current out-put accuracy less than 0.3%in actual engineering applications.关键词
压控恒流源/运算放大器/线性拟合/DACKey words
voltage-controlled constant current source/operational amplifier/linear fitting/DAC分类
信息技术与安全科学引用本文复制引用
陈涛,罗凡,刘合卫,李巍..一种高精度压控电流源电路的设计与实现[J].集成电路与嵌入式系统,2026,26(5):83-88,6.
