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________________ is employed with resistive transducers which require an external source of excitation?

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________________  is employed with resistive transducers which require an external source of excitation?

(a) dc bridge amplifier

(b) ac coupled amplifier

(c) carrier amplifier

(d) differential amplifier

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This key question is from Single Channel Telemetry System topic in portion Biomedical Telemetry of Biomedical Instrumentation

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The correct answer is (a) dc bridge amplifier

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

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