1.

The amplifier from the following that has a limited frequency response is _________(a) dc amplifiers(b) differential amplifier(c) ac coupled amplifiers(d) carrier amplifiersThe 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

Answer»

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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