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Electronic Devices & CircuitsInstrumentation Amplifiers

A three-op-amp instrumentation amplifier is widely used with bridge sensors because it can amplify?

  • AA small differential signal riding on a common-mode voltage
  • BOnly a pure DC supply voltage
  • COnly digital logic levels
  • DOnly oscillator noise
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Correct Answer: A. A small differential signal riding on a common-mode voltage
Explanation: Bridge sensors often produce a small differential output superimposed on a common-mode level; an instrumentation amplifier provides gain with strong common-mode rejection.
Reference: Standard analog electronics: bridge sensor interface
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