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GATE 2024 BM – Question 58

Sensors and Bioinstrumentation · Biopotentials and Electrodes · 2 marks · Numerical answer

An ECG channel has bandwidth 0.5–100 Hz. A single ADC digitizes eight channels. Find the minimum aggregate sampling rate in Hz, nearest integer.

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Correct answer: 1600 to 1600

Explanation

Nyquist sampling requires at least twice the highest frequency, or two hundred samples per second per channel. Time-sharing the ADC across eight channels requires an aggregate 8×200=1600 samples per second. Therefore the requested minimum is 1600 Hz under the ideal sampling assumption.

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