A novel design of EEG signal amplifier

A novel high-performance EEG signal amplifier based on the driven-right-leg technology was designed in this paper, where the differential amplifier circuit, driven-right-leg circuit and pre-amplifying parts are applied to denoise the common-mode interference signals. The pre-amplifier and 2-stage post-amplifier realize the EEG signal amplified. The two low-pass filters and two 50Hz traps were arranged reasonably to reject the high/medium-frequency interference effectively from the EEG signal. In this way. the efficient EEG signal detection can be implemented under non-shielded room condition. Testing results showed that the performance of all parts of the EEG amplifier satisfies the requirement. The effectiveness of the design was proved by the real EEG signal sampled from the scalp of the detected person.