We propose an AC-coupled amplifier that offers a high in-put impedance, thus making it suitable for bioelectric signal amplifi-
cation. We also present the necessary formulas for calculating its input impedance and transfer function in order to facilitate its adaptation to different applications.
Pallas, R; Colominas, J;Rosell, J. An improved buffer for bioelectric signals. IEEE Transactions on Biomedical Engineering ,1989, vol. 36, núm.4 p. 490-493