Physiological signal amplifier circuitry

Details Physiological signal amplifier circuitry Physiological signal amplifier circuitry

1983-07-26

1985-07-23

Kamm, William E.

Surgery

Truss

Pad

128902, A61B 504

Patent

active

045303657

ABSTRACT:
The purpose of the present invention is to provide a physiological signal amplifier circuitry exhibiting higher common mode rejection ratio with no necessity of adjustment. To realize this, outputs of the differential amplifiers are average to produce reference potential which is supplied, through a high gain amplifier, to invert terminals of the same differential amplifier as well as to invert terminals of other differential amplifiers connected to other electrodes. In the embodiment employed for the electrocardiograph, the reference potential is produced by the differential amplifier connected to extremity electrodes, and other differential amplifiers are connected to the chest electrodes.

REFERENCES:
patent: 3757778 (1973-09-01), Graham
patent: 3868948 (1975-03-01), Graetz
patent: 3880146 (1975-04-01), Everett et al.
patent: 3991748 (1976-11-01), Ohlsson

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