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In ion analysers, which of the following serve the dual purpose of controlling the operating current of FET and providing current gain?

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In ion analysers, which of the following serve the dual purpose of controlling the operating current of FET and providing current gain?

(a) FET itself does it

(b) SCR

(c) Op-amp

(d) Diode

I have been asked this question in a national level competition.

My question comes from Ion Analyser topic in portion pH Meters and Ion Analysers of Analytical Instrumentation

1 Answer

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Correct answer is (c) Op-amp

Explanation: In ion analysers, op-amp serves the dual purpose of controlling the operating current of FET and providing current gain. Two FETs are operated as source followers.

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