傳感器前端電路靈敏度研究

傳感器前端電路靈敏度研究
 
摘要：由于傳感器的輸出信號1般都很微弱，因此需要專門的信號測量電路將其放大或者變換為易傳輸、處理、記錄和顯示的形式。本文中所討論前端電路就是指這種信號測量電路。常見的信號測量電路有電橋、運算放大器、電荷放大器等，它們根據(jù)需要，分別與相應(yīng)的傳感器相配合。本文通過建立各種前端電路的輸出方程，并進1步求出靈敏度表達式，運用Mathematica求出前端電路的最高靈敏度，然后對比各種前端電路，找出最佳方案。

關(guān)鍵詞：測量電路，靈敏度，電橋，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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