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体表心电放大器的研究与设计,页数：29字数：9425摘 要本文主要介绍了心电信号的放大、滤波和光电耦合。鉴于心电信号的幅度仅为微伏、毫伏量级；人体携带有工频干扰以及所测量的参数外的其他生理作用的干扰；心电信号源本身是高内阻的微弱信号源，通过电极提取又呈现出不稳定的高内阻性质等因素,电路采用了具有...
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体表心电放大器的研究与设计
页数：29 字数：9425
体表心电放大器的研究与设计
摘 要
本文主要介绍了心电信号的放大、滤波和光电耦合。
鉴于心电信号的幅度仅为微伏、毫伏量级；人体携带有工频干扰以及所测量的参数外的其他生理作用的干扰；心电信号源本身是高内阻的微弱信号源，通过电极提取又呈现出不稳定的高内阻性质等因素,电路采用了具有高输入阻抗、高共模抑制比、低噪声、低温漂的差动放大电路。
造成生物电信号提取过程的主要干扰,是近场50Hz干扰源，因为各种生物电信号中大都包含有50Hz的频率成分，而且生物电信号的强度远远小于50Hz的干扰。近场50Hz干扰不仅直接影响心电信号的提取，而且它存在于所有的测量环境中。因此本电路采用了双T滤波器来抑制近场50Hz干扰。
为了人体的安全，本电路采用了浮地形式互补式光电耦合电路，光电耦合器件具有重量轻,应用电路结构简单,成本低等突出的优点。在生物医学电子学中得到广泛应用,它具有良好的线性和一定的转换速度。既可以作为模拟信号的转换,也可以作为数字信号的转换。光电器件受到欢迎的另一个原因是它能实现与TTL电路的兼容。互补形式的耦合级电路，它利用两个光电器件特性的对称性提高耦合级电路的线性度。以便实现人体与电器的隔离。
关键词： 心电信号,放大,滤波器,光电耦合
RESEARCH AND DESIGN OF THE ELECTRIC AMPLIFIER OF THE HEART FROM THE SURFACE OF BODY
ABSTRACT
This text introduces the amplifying of the heart electric signal, strain waves and photoelectric coupling mainly。
Seeing that the range of heart electric signal is only in quantity grade of microvolt, millivolt。The body of human carries interfering of frequently engineer and interference on other physiological function outside the parameters measured; The hearts electric signal source itself is a faint signal source with high hinder inside, Draw it through the electrode and demonstrate unstable factors such as high hindering inside nature ,etc。There are high input impedance, high suppress mould altogether, low in noise, low temperature float differential to enlarge in this circuit。
The main interference source to draw heart electric signal course is50Hz ,Because various kinds of living beings’ electric signal include 50Hz frequency, and the intensity of living beings’ electric signal is far smaller than the interference of 50Hz。 50Hz interference influent the abstraction of heart electric signal directly 。And there are 50Hz interference in all measurement environment 。This circuit adopt pairs of T wave filter to suppress 50Hz interference。
For security of human body, this circuit adopt gro
页数：29 字数：9425
体表心电放大器的研究与设计
摘 要
本文主要介绍了心电信号的放大、滤波和光电耦合。
鉴于心电信号的幅度仅为微伏、毫伏量级；人体携带有工频干扰以及所测量的参数外的其他生理作用的干扰；心电信号源本身是高内阻的微弱信号源，通过电极提取又呈现出不稳定的高内阻性质等因素,电路采用了具有高输入阻抗、高共模抑制比、低噪声、低温漂的差动放大电路。
造成生物电信号提取过程的主要干扰,是近场50Hz干扰源，因为各种生物电信号中大都包含有50Hz的频率成分，而且生物电信号的强度远远小于50Hz的干扰。近场50Hz干扰不仅直接影响心电信号的提取，而且它存在于所有的测量环境中。因此本电路采用了双T滤波器来抑制近场50Hz干扰。
为了人体的安全，本电路采用了浮地形式互补式光电耦合电路，光电耦合器件具有重量轻,应用电路结构简单,成本低等突出的优点。在生物医学电子学中得到广泛应用,它具有良好的线性和一定的转换速度。既可以作为模拟信号的转换,也可以作为数字信号的转换。光电器件受到欢迎的另一个原因是它能实现与TTL电路的兼容。互补形式的耦合级电路，它利用两个光电器件特性的对称性提高耦合级电路的线性度。以便实现人体与电器的隔离。
关键词： 心电信号,放大,滤波器,光电耦合
RESEARCH AND DESIGN OF THE ELECTRIC AMPLIFIER OF THE HEART FROM THE SURFACE OF BODY
ABSTRACT
This text introduces the amplifying of the heart electric signal, strain waves and photoelectric coupling mainly。
Seeing that the range of heart electric signal is only in quantity grade of microvolt, millivolt。The body of human carries interfering of frequently engineer and interference on other physiological function outside the parameters measured; The hearts electric signal source itself is a faint signal source with high hinder inside, Draw it through the electrode and demonstrate unstable factors such as high hindering inside nature ,etc。There are high input impedance, high suppress mould altogether, low in noise, low temperature float differential to enlarge in this circuit。
The main interference source to draw heart electric signal course is50Hz ,Because various kinds of living beings’ electric signal include 50Hz frequency, and the intensity of living beings’ electric signal is far smaller than the interference of 50Hz。 50Hz interference influent the abstraction of heart electric signal directly 。And there are 50Hz interference in all measurement environment 。This circuit adopt pairs of T wave filter to suppress 50Hz interference。
For security of human body, this circuit adopt gro
