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常规的桥路借助于微调电阻和电容的机械变动来达到平衡。众所周知，在多数情况下是很困难的，而且通常的交流桥路对容性传感元件变化的响应是非线性的。而利用标准运算放大器就可以容易地获得线性的桥路输出。本文推出了一种线性桥路的理论模型，并用实验证明了由理论预测的线性桥路的优良特性；给出了一种用于桥路平衡的自动化方法。
Conventional bridges are balanced by fine tuning the mechanical changes in resistance and capacitance. It is well known that in most cases it is difficult and the usual AC bridge’s response to capacitive sensing element changes is non-linear. A linear bridge output can be easily obtained using standard op amps. In this paper, a theoretical model of a linear bridge is introduced, and the excellent characteristics of the linear bridge predicted by the theory are proved by experiments. An automatic method for bridge balancing is given.