测力传感器放大器设计

论文编号:DQ173   论文字数:14450,页数:47

摘  要

 运算放大器广泛应用于各种模拟电路、数模混合电路中，而由于各自所用的目标电路不同，侧重的指标也有所差别。对国内外相关的研究动态进行了仔细的调研，分析了运算放大器的一些性能指标，仔细比较了各种实现电路的优缺点。在文献综述的基础上，设计了一种运用集成运放组成的放大电路，实现对测力传感器等的微弱电压信号的放大。并要求放大器的放大倍数可调，以实现对比较大的范围的被测信号的测量。测量放大器的前级采用差分放大，然后经过双端信号到单端信号的转换，并经比例放大器进行放大，从而实现对放大倍数的控制。
 结果表明，所设计的测力传感器放大器基本满足指标要求。测试后的电路已应用于测力传感器放大电路中。

关键词：传感器、运算放大器、集成电路、高增益

Abstract

Operational amplifier is widely used in all kinds of analog and mixed-signal circuit. There are many differences of focused performance because it is applied for differential circuit. According to the most recent research of relative field,the specification of the operational amplifier are discussed. All kinds of structure of low-votage op-amp were compared and analyzed. On the base of the structure of other papers, a circuit was designed, which primarily through the use of integrated operational amplifier circuit to enlarge the composition of measurement of the sensors weak voltage signal amplification, requiring a higher common mode rejection capability. So differential input is the measurement of the pre-amplifier, and then after a two-terminal signal to the single-ended signal conversion,and ultimated by the ratio of the amplifer amplification.
The results demonstrate that the sensor amplifier satisfies the parameters set beforehand. After slight modification, this circuit has been successfully applied to capacitor accelemeter.

Keywords：sensors、operational amplifier、integrated circuit、high gain

目 录
摘  要 I
Abstract II
1  绪论 1
1.1 研究背景及意义 1
1.2 本设计的要求和安排 2
2  传感器 3
2.1 传感器分类 3
2.2 传感器的静态特性 4
2.3 传感器的动态特性 4
2.4 传感器的线性度 4
2.5 传感器的灵敏度 5
3 运算放大器 6
3.1 运算放大器的发展概况 6
3.2 运算放大器发展的特点 6
3.3 运算放大器发展的几个主要方向 7
3.4 运算放大器的特点 7
3.5 运算放大器的结构 11
3.6 运算放大器的应用 23
4 MOS管的基本特性 26
4.1  MOSFET的结构 26
4.2  MOSFET的工作状态 27
4.3  MOS管的小信号模型 28
4.4  MOS管的噪声及对精度的影响 31
5  测力传感器放大器设计 33
5.1 稳压电源设计 33
 5.2 放大电路设计 35
 5.3电路板安装与调试  38
6  结论 41
致谢 42
参考文献 43