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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-24 9:20 |
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Conference: Bucharest University Faculty of Physics 2011 Meeting
Section: Biophysics; Medical Physics
Title:
New Designed EEG Amplifier – Theoretical Calculations and Experimental Signal Recordings
Authors:
Cristian Donos, Aurel Popescu, Liviu C. Giurgiu
Affiliation:
University of Bucharest, Faculty of Physics, 405 Atomistilor Street, Bucharest - Magurele, Romania
E-mail
cristidonos@yahoo.com, aurel.popescu.46@gmail.com, liviu.giurgiu@g.unibuc.ro
Keywords:
instrumentation amplifier, EEG signals, evoked potentials
Abstract:
A very low noise amplifier, capable of recording signals in the nV range, over a very large frequency band (0.1 Hz – 0.4 MHz) was designed and built. The amplifier was conceived as a tool that will be used to record EEG signals and evoked potentials as well. The electronic design of the amplifier is based on differential cascodes (JFET - BJT transistors connected in a common source - common base configuration). The equivalent input noise of the amplifier is 7nV/sqrt(Hz) measured at 22 Hz, corresponding to 1/f corner frequency. The amplifier’s signal-to-noise ratio is 125 dB. An EEG signal, was recorded using the amplifier then filtered and compared to some EEG signals taken from the scientific literature.
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