传感器前端电路灵敏度研究
 
摘要：由于传感器的输出信号一般都很微弱，因此需要专门的信号测量电路将其放大或者变换为易传输、处理、记录和显示的形式。本文中所讨论前端电路就是指这种信号测量电路。常见的信号测量电路有电桥、运算放大器、电荷放大器等，它们根据需要，分别与相应的传感器相配合。本文通过建立各种前端电路的输出方程，并进一步求出灵敏度表达式，运用Mathematica求出前端电路的最高灵敏度，然后对比各种前端电路，找出最佳方案。

关键词：测量电路，灵敏度，电桥，放大器

Research on sensitivity of sensor front-end circuit
 
Abstract ：As the sensor output signal are generally weak, so we should transform or enlarge it to easier transmission, processing, recording and display form by using specialized signal metering circuit. The front-end circuit discussed in this paper means that specialized signal metering circuit. Usually it includes bridge circuit, operational amplifiers, charge amplifier, they go with the corresponding sensor according to their needs. In this paper, we establish the output equations of various front-end circuit, then deduce sensitivity expression, obtained the maximum sensitivity by using Mathematica, and then contrast the various front-end circuit, to identify the best option.

Keywords ：Metering circuit ; Sensitivity ;Electric bridge ;Amplifier
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