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The impedance of the input should be ________ in order to obtain high CMRR in the differential amplifier.

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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 low

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I want to ask this question from Sources of Noise in Low Level Measurements in portion Recording System of Biomedical Instrumentation

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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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