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The amplifier from the following that has a limited frequency response is _________

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The amplifier from the following that has a limited frequency response is _________

(a) dc amplifiers

(b) differential amplifier

(c) ac coupled amplifiers

(d) carrier amplifiers

The question was posed to me by my school principal while I was bunking the class.

The question is from Telemedicine System topic in section Telemedicine Technology of Biomedical Instrumentation

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Correct option is (a) dc amplifiers

The best explanation: AC amplifiers have a limited frequency response and are, therefore, used only for special medical applications such as electrocardiograph machine. For electrocardiograms, an ac amplifier with sensitivity, giving 0.5 mV/cm, and frequency response up to 1 kHz and an input impedance of 2 to 5 MW is used. For such applications as retinography, EEG and EMG, more sensitive ac amplifiers are required, giving a chart sensitivity of say 50 mV/cm with a high input impedance of over 10 MW.

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