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Among the following, which has CMRR is of an order of 100-120 dB?(a) VCG(b) ECG(c) PCG(d) EEGI got this question during a job interview.Origin of the question is Biotelemetry Application on Wimax Networks in division Biomedical Telemetry of Biomedical Instrumentation

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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