论文编号:TX075        论文字数:8873,页数:23

摘要
本系统利用高精度通用运算放大器INA128对输入的心电信号进行放大，再进行滤波，滤去频率较高生物电信号，同时采用右脚屏蔽驱动电路，消除50Hz干扰信号，然后通过信号变换，经过3KHz低通滤波器（仿真普通电话信道），最后在医院站通过信号接收和变换，实现医院监护站实时显示。在普通示波器上得到清晰的心电波形，并可看出采样率。
经放大处理后的心电信号通过A/D转换器AD7701转换成数字信号，然后XRR2206调制电路对数字心电信号进行调制；在医院接收端先经过解调电路解调，再通过D/A转换器DAC0808转换成模拟信号，最后在示波器上显示心电信号波形。
关键词：心电信号  仪表放大器  有源滤波  调制解调

Abstract:
This system makes use of the high accuracy  in general use operation  enlarger INA128 to carry on enlarge to the heart telecommunication number of the importation, then carry on the wave of  , the  goes to the frequency  higher living creature  telecommunication number, adopting the right foot to shield to drive the electric circuit at the same time, remove the 50 Hz  interference signal, then pass the signal transformation, through a filter( imitate the true common telephone  letter way) of 3 KHz, the end stands to receive through a signal at the hospital and transformation, carry out the hospital guardianship station to show for solid hour.Show a machine in the commonness up get the clear heart  electric wave form, and can see a sample rate.
Pass through enlarge the heart telecommunication number of handle the empress the A/ D  conversion machine  AD7701 conversion become the numerical signal, then the XRR2206 make the electric circuit logarithms  word heart  telecommunication number to carry on make;Receive to carry at the hospital to adjust the electric circuit solution to adjust through solution first, then pass the D/ A  conversion machine DAC0808 conversion to become the emulation signal, the end shows the heart telecommunication  number a form in showing a machine.
Keyword:  The heart electricity  signal appearance enlarger contain the source  wave make the solution to adjust

目录
1 摘要………………………………………………………………………………8
Abstract……………………………………………………………………………8
2 设计分析与方案论证……………………………………………………………10
  2.1 原理分析和说明……………………………………………………………10
      2.1.1 心电信号放大电路基本原理………………………………………10
      2.1.2 心电图原理说明……………………………………………………10
      2.1.3 心电信号特点分析…………………………………………………11
  2.2 数据采集部分………………………………………………………………12
      2.2.1 前置放大部分………………………………………………………12
3 心电信号处理部分………………………………………………………………15
  3.1 屏蔽电路……………………………………………………………………15
  3.2 滤波器………………………………………………………………………15
  3.3 A/D、D/A转换电路…………………………………………………………18
  3.4 调制与解调电路……………………………………………………………22
      3.4.1 调制器………………………………………………………………22
      3.4.2 解调器………………………………………………………………22
  3.5 3KHZ低通滤波………………………………………………………………24
      3.5.1 有源滤波……………………………………………………………24
      3.5.2 数字滤波方案………………………………………………………24
4 稳压电源…………………………………………………………………………25
  4.1 保护功能……………………………………………………………………26
  4.2 瞬变电压的防护……………………………………………………………26
总结…………………………………………………………………………………28
参考文献……………………………………………………………………………29

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