感測器前端電路靈敏度研究
摘要：由於感測器的輸出訊號1般都很微弱，因此需要專門的訊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訊號測量電路。常見的訊號測量電路有電橋、運算放大器、電荷放大器等，它們根據需要，分別與相應的感測器相配合。本文通過建立各種前端電路的輸出方程，並進1步求出靈敏度表示式，運用Mathematica求出前端電路的最高靈敏度，然後對比各種前端電路，找出最佳方案。
關鍵詞：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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