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Among the following, which has CMRR is of an order of 100-120 dB?

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in Biomedical Instrumentation by (76.6k points)
Among the following, which has CMRR is of an order of 100-120 dB?

(a) VCG

(b) ECG

(c) PCG

(d) EEG

I got this question during a job interview.

Origin of the question is Biotelemetry Application on Wimax Networks in division Biomedical Telemetry of Biomedical Instrumentation

1 Answer

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Best answer
Right answer is (b) 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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