中圖分類號； TN432 文獻標識碼： A DOI：10.16157/j.issn.0258-7998.211542 中文引用格式： 楊朝龍,，劉斌,，張志浩，等. 一種新型高精度電流檢測電路的設(shè)計[J].電子技術(shù)應(yīng)用,，2021,，47(11)：39-43，46. 英文引用格式： Yang Chaolong,，Liu Bin,，Zhang Zhihao，et al. Design of a new high-accuracy current sense circuit[J]. Application of Electronic Technique,，2021,，47(11)：39-43,，46.
Design of a new high-accuracy current sense circuit
Yang Chaolong1，Liu Bin2,，Zhang Zhihao1,，3，Zhang Guohao1,，3
1.School of Information Engineering,，Guangdong University of Technology，Guangzhou 510006,，China,； 2.Foshan Zhenzhi Micro Chip Technology Company，Guangzhou 510006,，China,； 3.Heyuan Synergy Innovation Institute of GDUT，Heyuan 517000,，China
Abstract： 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 0.13 μm 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.
Key words : current sense,；sensing resistor；rail-to-rail transconductance amplifier,；high accuracy
