心电信号浮地放大器的设计.doc

心电信号浮地放大器的设计 摘 要 心电现象是人体生命活动的基本属性之一，它是反映人体生理状态的一种重要信息，心电图在医学上被广泛运用。心电信号属于低频的微弱信号，为了对其进行处理和显示，必须将其放大到适当的幅度。该论文分析了心电信号放大器的安全性、共模抑制比、输入阻抗、抗干扰能力与输入噪声等性能指标，讨论了心电信号放大器的发展趋势，以光电耦合方式作为本课题的研究方向，提出了一个心电信号浮地放大器的设计方案。 在该课题中，完成了心电信号浮地放大器的单元电路设计，包括前置放大电路、高通滤波器、50Hz陷波器、光电耦合隔离电路、低通滤波器、后级放大电路与浮地电源，并制作成一个实验装置。通过对电路的仿真和实验装置的测试，检测了所设计的心电放大器的通频带、50Hz陷波、共模抑制比、输入阻抗与增益等主要性能指标，根据检测结果对所设计的电路进行了分析评价。 关键词：心电信号，浮地放大器，隔离，光电耦合  ABSTRACT Electrocardio one of the basic attributes of human life, it reflects an important information of the physiological state. ECG has been widely used in medicine. Electrocardiosignal is a weak low-frequency signal, in order to process and display, it must be enlarged to the appropriate rate. This article analyzes performance indicators of electrocardiosignal amplifier, included safety, common mode rejection ratio, input impedance, anti-interference ability input noise etc. It discusses the development trend of electrocardiosignal amplifier, and with photocoupling for the subject of this research, gives a design of electrocardiosignal isolation amplifier. In this task, it has completed the design of unit circuits for electrocardiosignal isolation amplifier, including the pre-amplifier, high-pass filter, 50Hz notch filter, photocoupling isolation circuits, low-pass filter, after-class amplifier circuit and floating power supply, and an experimental device has been made. With simulation for the circuit and test for the experimental device, it detects the major performance indicators of the electrocardiosignal isolation amplifier designed in this task, including pass band, 50Hz Notch, common mode rejection ratio, input impedance, gain etc. According to test results, it gives analysis and evaluation to the circuit. Key words： electrocardiosignal, isolation amplifier, isolation, photocoupling   目 录 中文摘要 Ⅰ ABSTRACT Ⅱ 1绪论 1 1.1 心电介绍 1 1.2 心电图仪发展简史 2 1.3心电图与心电图机的应用 3 1.4心电图与心电图机的发展趋势 4 1.5 心电信号放大器 5 1.5.1 心电放大器的意义 5 1.5.2 心电信号放大器的发展 5 1.5.3 心电信号浮地放大器 5