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Which machines CMRR is of order of 100-120 dB?

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in Biomedical Instrumentation by (76.6k points)
Which machines CMRR is of order of 100-120 dB?

(a) VCG

(b) PCG

(c) EEG

(d) ECG

The question was posed to me during an interview.

The above asked question is from System Concepts in section Patient Monitoring System of Biomedical Instrumentation

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Best answer
Right option is (d) ECG

The best I can explain: CMRR of the order of 100–120 dB with 5 kW unbalance in the leads is a desirable feature of ECG machines. In addition to this, under specially adverse circumstances, it becomes necessary to include a notch filter tuned to 50 Hz to reject hum due to power mains.

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