Which of the following amplifiers are used with transducers which require an external source of excitation?(a) ac coupled amplifiers(b) dc amplifiers(c) carrier amplifiers(d) differential amplifierI got this question in an internship interview.My query is from Telemedicine System in chapter Telemedicine Technology of Biomedical Instrumentation

Which of the following amplifiers are used with transducers which requ

1.	Which of the following amplifiers are used with transducers which require an external source of excitation?(a) ac coupled amplifiers(b) dc amplifiers(c) carrier amplifiers(d) differential amplifierI got this question in an internship interview.My query is from Telemedicine System in chapter Telemedicine Technology of Biomedical Instrumentation
Answer» The correct choice is (c) carrier amplifiers For explanation I would SAY: Carrier amplifiers are used with transducers which require an external source of excitation. 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. They are characterized by high gain, negligible drift, extremely low noise and the ABILITY to operate with resistive, inductive or capacitive type transducers.

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