一种基于MOSFET镜像结构的电流模式惠斯通电桥  

A Current Mode Wheatstone Bridge Based on MOSFET Mirror Configuration

作　　者：简榕杰 赵芳琦 Jian RongJie;Zhao Fangqi(College of Engineering and Technology,Yangen University,Quanzhou Fujian 362014;Electrical Engineering College,Northeast Electric Power University,Jilin Jilin 132012)

机构地区：[1]仰恩大学工程技术学院,福建泉州362014 [2]东北电力大学电气工程学院,吉林吉林132012

出　　处：《东北电力大学学报》2020年第3期68-74,共7页Journal of Northeast Electric Power University

基　　金：2017年福建省中青年教师教育科研项目(JAT170717)。

摘　　要：为了实现惠斯通电桥更好的输出线性特性和响应的稳定性,文中基于MOSFET管的镜像结构提出了一种新的电流模式驱动的惠斯通电桥电路设计.采用CMOS技术和具有共模反馈的简化电路设计,仅由2个敏感电阻器、1个恒定的激励电流、1个运算放大器和3个电流镜像构成,使得电路更加灵活,减少了电路元器件和有效面积,单电源电压工作,可适用于低压集成电路的实现.仿真结果表明,文中提出的惠斯通电桥电路结构相比于其他惠斯通电桥电路结构,不仅具有更好的线性特性,而且对频率和温度的响应特性也更稳定,从而使得整体电路具有较低的功耗.In order to achieve the better the output characteristics of linearity and the stability of response for Wheatstone bridge,a new current mode-driven Wheatstone bridge circuit design is proposed basing on the mirror configuration of MOSFETs.The simplified circuit design is implemented in CMOS technology and Common Mode FeedBack and it consists of only two sensitive resistors,a constant excitation current,an operational amplifier and three current mirrors.This circuit design leads to more flexibility of the circuit and the circuit components and the effective area are reduced.It operates in single supply voltage and is suitable for the realization of the low-voltage integrated circuits.The simulation results show that the Wheatstone bridge circuit configuration proposed in this paper,compared with other Wheatstone bridge circuit configurations,not only has better characteristics of linearity,but also more stable response characteristics for frequency and temperature,which makes the whole circuit with low power consumption.

关 键 词：惠斯通电桥 电流模式驱动 镜像结构 CMOS技术 线性稳定性 

分 类 号：TP212.13[自动化与计算机技术—检测技术与自动化装置]