测量放大器课程设计报告书

测量放大器_课程设计

目录

摘要 ................................................................................................... - 2 - Abstact .................................................................................................. - 3 - 1．引言 ................................................................................................ - 3 - 2测量放大器2.1任务............................................................................. - 4 -

2.1.1基本要求.................................................................................. - 4 -

2.1.2 发挥部分 ................................................................................. - 5 - 2.2测试说明： ....................................................................................... - 6 - 3方案设计与论证：................................................................................. - 7 -

3.4电源电路的设计： ...................................................................... - 11 -

3.4.1降压部分：............................................................................. - 12 -

3.4.2整流部分：............................................................................. - 12 -

3.4.3滤波部分：............................................................................. - 12 -

3.4.4稳压部分：............................................................................. - 13 -

3.5信号变换电路：.......................................................................... - 14 -

3.6单片机控制部分： ...................................................................... - 14 - 4主要的电路参数计算............................................................................ - 15 -

4.2电源参数的计算： ...................................................................... - 17 - 5电路调试： ........................................................................................ - 17 -

5.1调试所用仪器：.......................................................................... - 18 -

5.2电源参数测试：.......................................................................... - 18 -

5.3放大器放大性能的测试：............................................................. - 18 -

5.4测量放大器的频率响应测试：....................................................... - 19 - 6元器件清单：..................................................................................... - 20 - 7设计感想及总结：............................................................................... - 21 -

8参考文献： ........................................................................................ - 23 -

摘要

本设计主要由测量放大器、信号变换器、稳压电源三部分组成，测量放大器主要是实现对微信号的测量，主要通过运用集成运放组成测量放大电路实现对微弱电压信号的放大，要求有较高的共模抑制能力及较高的输入电阻，从而减少测量的误差及对被测电路的影响，并要求放大器的放大倍数可调以实现对比较大的围的被测信号的测量，因而测量放大器的前级主要采用差分输入的方式，然后经过双端信号到单端信号的转换，最终经比例放大器进行放大，比例放大器的反馈电阻可以由D/A组成的电阻网络代替，通过单片机对其阻值进行控制，从而实现对放大倍数的控制，放大倍数可以由单片机控制键盘进行输入，控制液晶或数码管进行显示。信号变换电路主要实现一端信号输出到两端输出的转变，主要采用的是经过改进的差分式放大电路，信号变换在本设计中的用途主要是用于对测量放大电路的频率响应进行测试。稳压电源电路主要用于为运放及电桥供电，包括测量放大电路及信号变换器中的运放。

Abstact

The design is mainly maded of three parts of measuring amplifiers, signal converters, power supply. Measuring amplifier is mainly to achieve micro-signal measurements, primarily through the use of integrated operational amplifier circuit to enlarge the composition of measurement of weak voltage signal amplification, requiring a higher common mode rejection capability and high input resistance, thereby reducing error of measurement and the impact of the circuit under test and it requires magnification adjustable amplifier in order to achieve greater contrast to the scope of the measured signal measurement. So