Circuit Techniques for Reducing the Effect of Analog Signal Conditioning Imperfections in EEG Measuring

New ideas are necessary to improve the quality of electroencephalogram (EEG) type bio-signal recordings, as a module of a brain computer interface (BCI). The EEG signals are a result of noninvasive recording technology. The recorded signals are usually of low amplitude (in μV domain) and noisy signals. To be able to extract technically usable information from these signals, it is necessary to amplify and filter them. To amplify and filter bio-signals, special and quality electronic concepts must be used. In this paper we are able to present the structure of an amplifier based on an original concept as a result of our NSRG research. The concept is implemented and tested. This amplifier should have a successful contribution to reduce the effect of imperfect conditioning of the analog channel of bio-signal recording.