Question

Which on the following is not a type of isolation amplifier?

(a) capactively coupled isolation amplifiers

(b) optically isolated isolation amplifiers

(c) resistive coupled isolation amplifiers

(d) transformer type isolation amplifiers

This question was addressed to me in exam.

My question is taken from Biomedical Signal Analysis and Processing Techniques in portion Recording System of Biomedical Instrumentation

Answer 1

The correct answer is (c) resistive coupled isolation amplifiers

Best explanation: There is nothing such as the resistive coupled isolation amplifiers. All the other three types are in common use, though the transformer isolation amplifier is more popular. Opto-coupled amplifier uses a minimum number of components and is cost effective, followed by the transformer coupled amplifier. The capacitor coupled amplifier is the most expensive.