What is responsible for most of the common-mode interfering signal?(a) Preamplifier(b) Notch Filter(c) Power Line Hum(d) Band Pass FilterI got this question by my college professor while I was bunking the class.Enquiry is from Ambulatory Monitoring Instruments topic in division Arrhythmia and Ambulatory Monitoring Instruments of Biomedical Instrumentation

What is responsible for most of the common-mode interfering signal?(a)

1.	What is responsible for most of the common-mode interfering signal?(a) Preamplifier(b) Notch Filter(c) Power Line Hum(d) Band Pass FilterI got this question by my college professor while I was bunking the class.Enquiry is from Ambulatory Monitoring Instruments topic in division Arrhythmia and Ambulatory Monitoring Instruments of Biomedical Instrumentation
Answer» Correct answer is (C) Power Line Hum Best explanation: A sizable common-mode signal manages to PASS through the input amplifier, a circumstance to be expected whenever electrodes spaced a few CENTIMETRES apart are ATTACHED to the human body in a hospital environment. Power line hum is responsible for most of the common-mode interfering signal. This is SUPPRESSED by a notch filter following the input amplifier.

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