生物电放大器实验系统的构建与分析

摘要

Objective To design a small experiment system for bio- amplifier. Methods The core circuit for the system was constructed using AD8132、AD620 and TLP512-1. Results Input impedance was more than 10 GΩ, the common-code rejection ratio(CMRR) was more than 80 dB, the upper cut-off frequency was 55.3Hz and the upper cut-off frequency was 44.5Hz for the 50Hz trap filter. Conclusion The experiment system has the characters of high CMRR、high input impedance and being easy to measure, which is helpful for the students to study bio -amplifier. [Chinese Medical Equipment Journal, 2011,33(1):16-18,46]%目的:设计一种小型的生物电隔离放大器实验系统.方法:应用AD8132、AD620、TLP512-1等构成放大电路的核心部分.结果:输入阻抗大于10 GΩ;共模抑制比＞80 dB；50 Hz陷波电路的上限截止频率为55.3 Hz,下限截止频率为44.5 Hz.结论:实验系统具有高输入阻抗、高共模抑制比等特点,便于测量,有助于学生对生物电放大器的学习.