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Preamplifiers used in electroencephalograph have high gain and low noise characteristics.

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Preamplifiers used in electroencephalograph have high gain and low noise characteristics.

(a) True

(b) False

I had been asked this question by my college director while I was bunking the class.

This key question is from Measurement of Heart Rate in chapter Patient Monitoring System of Biomedical Instrumentation

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Right choice is (a) True

Easiest explanation: Yes, preamplifier used in electroencephalographs must have high gain and low noise characteristics because the EEG potentials are small in amplitude. In addition, the amplifier must have very high common-mode rejection to minimize stray interference signals from power lines and other electrical equipment.

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