The impedance of the input should be ________ in order to obtain high CMRR in the differential amplifier.(a) low(b) High(c) Does not matter(d) Very lowThe question was posed to me in quiz.I want to ask this question from Sources of Noise in Low Level Measurements in portion Recording System of Biomedical Instrumentation

The impedance of the input should be ________ in order to obtain high

1.	The impedance of the input should be ________ in order to obtain high CMRR in the differential amplifier.(a) low(b) High(c) Does not matter(d) Very lowThe question was posed to me in quiz.I want to ask this question from Sources of Noise in Low Level Measurements in portion Recording System of Biomedical Instrumentation
Answer» The CORRECT option is (B) High Best explanation: This shows that high input impedance is very necessary in order to obtain a high CMRR. Also, the electrode skin resistance should be low and as nearly EQUAL as possible.In order to be able to MINIMIZE the effects of changes occurring in the electrode impedances, it is necessary to employ a preamplifier having a high input impedance.

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