一种新型高精度电流检测电路的设计  

Design of a new high-accuracy current sense circuit

作　　者：杨朝龙 刘斌 张志浩[1,3] 章国豪 Yang Chaolong;Liu Bin;Zhang Zhihao;Zhang Guohao(School of Information Engineering,Guangdong University of Technology,Guangzhou 510006,China;Foshan Zhenzhi Micro Chip Technology Company,Guangzhou 510006,China;Heyuan Synergy Innovation Institute of GDUT,Heyuan 517000,China)

机构地区：[1]广东工业大学信息工程学院,广东广州510006 [2]佛山臻智微芯科技有限公司,广东广州510006 [3]河源广工大协同创新研究院,广东河源517000

出　　处：《电子技术应用》2021年第11期39-43,46,共6页Application of Electronic Technique

基　　金：广东省重点领域研发计划(2018B010115001);国家自然科学基金(61974035);广东省“珠江人才计划”本土创新科研团队(2017BT01X168)。

摘　　要：针对待检测的负载电阻在实际电路中存在偏差问题,提出新型轨到轨电流检测电路。利用对称的轨到轨跨导运放电路,将输入电压转化成电流,通过两级运放组成的负反馈电路,将电流输出。该电流检测电路增加了输入电压范围,也没有了传统串联电阻检测结构的采样保持支路,并且对待检测电阻进行步进设计来减小误差,进一步提高检测电路的精度。该电路采用GLOBALFOUNDRIES 0.13μm RF SOI-CMOS工艺实现,工作电压为5 V,启动时间为27 ns,静态功耗为1.17 mW,电流检测电路检测精度高达99.43%。This paper presents a novel rail-to-rail current-sensing circuit to solve the deviation of the load resistance.The input voltage is converted into current by a symmetrical rail-to-rail transconductance operational amplifier,while the output is generated by a negative feedback circuit composed of two stages operational amplifier.The current-sensing circuit increases the input voltage range without the employment of the sampler holding branch in the traditional series resistance sensing structure.The step-control design of the sensing-resistor is carried out to reduce the deviation and further improve the accuracy.The presented current-sensing circuit implemented in the GLOBALFOUNDRIES 0.13μm RF SOI-CMOS technology,exhibits the strat-up time of 27 ns,the static consumption of 1.17 mW,and the sensing accuracy of 99.43%under an operating voltage of 5 V.

关 键 词：电流检测 检测电阻 轨到轨跨导运放 高精度 

分 类 号：TN432[电子电信—微电子学与固体电子学]