HKIE Professional Assessment - Biomedical Discipline Practice Questions - HKIE Professional Assessment - Biomedical Discipline (Hong Kong Institution Of Engineers) Exam

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An electrocardiogram (ECG) biopotential amplifier records a differential cardiac signal of 1.0 mV alongside a common-mode power-line interference voltage of 2.0 V. If the differential gain is 1,000 and the Common Mode Rejection Ratio (CMRR) is 80 dB, what is the amplitude of the common-mode interference appearing at the amplifier output?

0.20 V 0.02 V 2.00 V 0.002 V

Correct Answer:

0.20 V

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