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 amplifierThis question was addressed to me in semester exam.I'd like to ask this question from Preamplifiers in chapter Recording System of Biomedical Instrumentation

Which of the following amplifier is employed with resistive transducer

1.	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 amplifierThis question was addressed to me in semester exam.I'd like to ask this question from Preamplifiers in chapter Recording System of Biomedical Instrumentation
Answer» 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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