Electromagnetically shielded narrow band electroencephalographic

Details Electromagnetically shielded narrow band electroencephalographic Electromagnetically shielded narrow band electroencephalographic

1985-04-25

1987-07-07

Mullins, James B.

Amplifiers

Involving structure other than that of transformers per se

With printed circuits

128731, 330 68, 330 69, 330260, 330306, H03F 100, A61B 504

Patent

active

046790020

ABSTRACT:
A low noise, high gain differential amplifier suitable for EEG amplification is constructed in a shielded metal enclosure, preferably on a ground plane circuit board. The amplifier is battery powered to eliminate all possibility of noise from the power system. The amplifier utilizes a pair of operational amplifiers to provide high input impedance for each of two input signals. A differential amplifier generates an internal signal which is filtered and amplified by a pair of bandpass amplifiers and overlapping low pass and high pass amplifiers.

REFERENCES:
patent: 3901215 (1975-08-01), John
patent: 4202354 (1980-05-01), Smith et al.
patent: 4350164 (1982-09-01), Allain, Jr.
Smith et al., "Portable Device For Detection of Petit Mal Epilepsy", IEEE Transactions on Biomedical Engineering, vol. BME-26, No. 8, Aug. 1979, pp. 445-450.

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