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Which of the following amplifier is employed with resistive transducers which require an external source of excitation?

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Which of the following amplifier is employed with resistive transducers which require an external source of excitation?

(a) differential amplifier

(b) ac coupled amplifier

(c) carrier amplifier

(d) dc bridge amplifier

This question was addressed to me in semester exam.

I'd like to ask this question from Preamplifiers in chapter Recording System of Biomedical Instrumentation

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Right answer is (d) dc bridge amplifier

Best explanation: DC bridge amplifiersare employed with resistive transducers which require an external source of excitation. Essentially, the amplifier comprises of a stable dc excitation source, a bridge balance and calibration unit, a high gain differential dc amplifier and a dc output amplifier. They can be used as conventional dc high gain amplifiers and offer operating simplicity and high frequency response.

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