INTERFERENCE REJECTION CHARACTERISTICS OF BIOPOTENTIAL AMPLIFIERS - A COMPARATIVE-ANALYSIS
INTERFERENCE REJECTION CHARACTERISTICS OF BIOPOTENTIAL AMPLIFIERS - A COMPARATIVE-ANALYSIS
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DOI：
10.1109/10.8676
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发表时间：
1988-11-01
影响因子：
4.6
通讯作者：
PALLASARENY, R
中科院分区：
文献类型：
--
作者：
PALLASARENY, R
综述了隔离和非隔离地基准型、双电极和三电极生物电势放大器中影响电力线干扰的电路参数。利用有效耦合阻抗的概念，比较了外部干扰对不同放大器的影响。其次，分析了输入阻抗不平衡的影响。结论是：隔离放大器中的干扰并不总是比非隔离放大器中的低，必须通过在共模抑制比(CMRR)和隔离模抑制比(IMRR)之间充分分担来减小干扰；增加共模输入阻抗总是减少三电极放大器中的干扰，而不是双电极放大器中的干扰；对于双电极放大器，不仅输入运算放大器的匹配很重要，而且第一级电路中元件的容差也很重要。
The circuit parameters contributing to power line interference in ground-referenced, two- and three-electrode biopotential amplifiers, both isolated and nonisolated, are reviewed. The effects of external interference on different amplifiers are compared by using the 'effective coupling impedance' concept. Next, an analysis of the effect of imbalanced input impedances is carried out. It is concluded that the interference in an isolated amplifier is not always lower than in a nonisolated one, and that it must be reduced by an adequate sharing between the CMRR (common mode rejection ratio) and the IMRR (isolation mode rejection ratio); that an increase in common mode input impedance always reduces interferences in three-electrode amplifiers but not in two-electrode amplifiers; and that in two-electrode amplifiers, not only is the matching of input op amps important, but also the tolerance of components in first-stage circuits.<>