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What is the CMRR of Foetal electrocardiogram?

What is the CMRR of Foetal electrocardiogram? Correct Answer 0-120 dB

Abdominal FECG processing circuit is used for computing foetal heart rate. After proper placement of the electrodes, the signals are amplified in a preamplifier which provides a very high input impedance (100 MW) and high sensitivity and good common mode rejection ratio (up to 120 dB).

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