增益可调通用高精度负载电流检测电路  

Universal high accuracy and gain-adjustable load current sensing circuit

作　　者：王泽宇[1] 来新泉[2] Wang Zeyu Lai Xinquan(Key Lab of High Speed Circuit Design and EMC, Ministry of Education of China Circuit CAD Institution, Xidian University, Xian 710071, China)

机构地区：[1]西安电子科技大学电子工程学院,陕西西安710071 [2]西安电子科技大学超高速电路与电磁兼容教育部重点实验室,陕西西安710071

出　　处：《华中科技大学学报（自然科学版）》2016年第9期6-10,共5页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(61106026);中央高校基本科研业务费专项资金资助项目(JB150222)

摘　　要：为了实现量化电流检测及提高检测精度,提出了一种负载电流检测电路.通过采用具有完全对称结构的共模负反馈以及差模正反馈检测架构,实现了对由制造工艺所引起失调的良好抑制,同时在电源轨范围内可对微小误差信号具有极其稳定且任意可调的放大倍数.该电路采用30V双极-CMOS-DMOS工艺实现,仿真及实测结果证明在各工艺角下,-40°-125°温度范围内检测误差均小于±3%.To quantify and improve the accuracy of load current detection,a load current sensing cir-cuit was proposed.By adopting a completely symmetrical common-mode negative feedback （CMNF） as well as the differential-mode positive feedback （DMPF）technique,the offset induced by process was greatly restrained.What′s more,the tiny sensing signal was able to be reliably amplified by an arbitrary time within the power rail.This proposed technique has been realized and verified in a 30 V bipolar-CMOS-DMOS （BCD）process,simulation as well as practical results show that the detection error can be less than ±3% with the temperature ranges from -40°to 125°.

关 键 词：电路 负载检测 电流采样 共模 差模 反馈 检测误差 

分 类 号：TN431.1[电子电信—微电子学与固体电子学]