A Radiofrequency-Coupled Input Stage for Biological Amplifiers

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Abstract
A description is given of an ungrounded input circuit consisting of a miniature radiofrequency transmitter, the carrier of which is modulated by the signal under investigation. After being transmitted to a receiver the carrier is demodulated, filtered, and the resulting signal used as the input to the standard amplifier. This method results in achievement of a high discrimination against interfering potentials without need to select closely matched components. An especially valuable feature is the elimination of the baseline shifts which often mask the recorded potentials when using a strong stimulus and recording with the differential amplifier.

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