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______________ are used with transducers which require an external source of excitation.

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______________ are used with transducers which require an external source of excitation.

(a) carrier amplifiers

(b) dc amplifiers

(c) ac coupled amplifiers

(d) differential amplifier

I had been asked this question in an online interview.

Origin of the question is Preamplifiers topic in chapter Recording System of Biomedical Instrumentation

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Right answer is (a) carrier amplifiers

The best explanation: Carrier amplifiers are used with transducers which require an external source of excitation. They are characterized by high gain, negligible drift, extremely low noise and the ability to operate with resistive, inductive or capacitive type transducers. They essentially contain a carrier oscillator, a bridge balance and calibration circuit, a high gain ac amplifier, a phase-sensitive detector and a dc output amplifier.

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