高性能生物电放大器的研制  

DESIGN OF A BIOELECTRIC AMPLIFIER WITH HIGH PERFORMANCE

作　　者：孙光启[1] 吴焕英[1] 何瑞荣[1] 

机构地区：[1]河北医学院基础医学研究所生理室

出　　处：《中国应用生理学杂志》1994年第4期363-366,共4页Chinese Journal of Applied Physiology

摘　　要：本室研制了以ＡＤ５２４芯片作前级放大器和有源高通－低通滤波器为主要部件的高性能生物电放大器。其共模抑制比为１１０ｄＢ，输入阻抗１０９Ω，内部噪声低于２．０μｖｐ－ｐ。其滤波器特性为：低通滤波器在其通带截止频率的３倍频处，衰减２０ｄＢ；高通滤波器在其通带截止频率的１／３倍频处，衰减３ｏｄＢ，在１／２倍频处衰减１５６Ｂ以上。该放大器与常用的两种生物电放大器ＡＢ－６２０Ｇ和ＡＶＢ－１０相比较，性能有大幅度提高。对家兔减压神经放电的对照记录说明，本放大器的结果优于其余两种放大器。By using a preamplifier of IC chip AD 524and an active highpass-lowpass fiter as the mainparts,a bioelectric amplifier with high performance was designed in this laboratory.Its commonmode reject ratio(CMRR)was 110 dB,input impedance was 109Ω,and internal noise level wasless than 2μVP-P. The characteristics of the filters were that the decay of amplitude was greaterthan 20 dB at the point of 3 × critical passband frequency for the lowpass filter, greater than 30dB at the point of 1 / 3 × critical passband frequency and greater than 15 dB at the point of 1 / 2×that frequency for the highpass filter.In comparison with two common kinds of bioelectricamplifiers(AB-620G,AVB-10),the performance of the amplifier reported was improvedsignificantly.In the experiment recording the afferent discharges of depressor nerve in the rabbit,the performance of this amplifier was superior to those of AB-620G and AVB-10.

关 键 词：生物电放大器 仪器 医疗医械 

分 类 号：R33－33[医药卫生—人体生理学] R197.39[医药卫生—基础医学]