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The range of CMRR of Foetal electrocardiogram is ______________

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The range of CMRR of Foetal electrocardiogram is ______________

(a) 0-120 dB

(b) 0-200 dB

(c) 0-150 dB

(d) 0- 130 dB

This question was addressed to me in an interview for internship.

This intriguing question originated from Measurement of Hearing in chapter Audiometry of Biomedical Instrumentation

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Correct option is (a) 0-120 dB

The best I can explain: The range of CMRR of Foetal electrocardiogram is 0-120 dB. After proper placement of the electrodes, the signals are amplified in a preamplifier which provides a very high input impedance (100 MW) and a high sensitivity and good common mode rejection ratio (up to 120 dB). Abdominal FECG processing circuit is used for computing foetal heart rate.

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