Which amplifier has a limited frequency response?(a) differential amplifier(b) dc amplifiers(c) ac coupled amplifiers(d) carrier amplifiersI have been asked this question in an interview for internship.This is a very interesting question from Preamplifiers in section Recording System of Biomedical Instrumentation

Which amplifier has a limited frequency response?(a) differential ampl

1.	Which amplifier has a limited frequency response?(a) differential amplifier(b) dc amplifiers(c) ac coupled amplifiers(d) carrier amplifiersI have been asked this question in an interview for internship.This is a very interesting question from Preamplifiers in section Recording System of Biomedical Instrumentation
Answer» The correct choice is (b) dc amplifiers Easiest 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 a 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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