Low-Noise, Interference-Resistant Amplifier Suitable for Biological Signals

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Science  02 Dec 1966:
Vol. 154, Issue 3753, pp. 1191-1192
DOI: 10.1126/science.154.3753.1191


Minor changes in conventional low-noise amplifier circuits decrease circuit noise and attenuate the unwanted effects of varying impedances and potentials which exist between commonly employed electrodes and the tissues of biological subjects. The resulting reduction of intrinsic amplifier noise and reduced susceptibility to external interference is helpful in the study of low-frequency signals of microvolt level.