本文分析了一般电桥电路产生非线性误差的原因,利用集成运算放大器的特点设计出了可以从电路上彻底消除非线性误差的电桥电路传感器。1 用一般电桥电路作为传感器所存在的问题如图1所示的单臂电桥,R_x的改变引起电桥的输出U。是非线性的,分析如下;利用基尔霍夫定律,可以求得流过负载的电流为: This paper analyzes the causes of non-linearity error of general bridge circuit, and uses the characteristics of integrated operational amplifier to design the bridge circuit sensor which can completely eliminate the nonlinear error from the circuit. 1 with the general bridge circuit as a sensor problems such as single-arm bridge shown in Figure 1, R_x change caused by the bridge output U. Is nonlinear and is analyzed as follows. Using Kirchhoff’s law, the current flowing through the load can be calculated as: