Analog and electronic circuits

Which amplifier, typically built from three op-amps, is used to amplify tiny differential signals from sensors with high precision?

  1. APower amplifier
  2. BInstrumentation amplifier
  3. CIntegrator
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Answer: B. Instrumentation amplifier

An instrumentation amplifier has high input impedance and a very large common-mode rejection ratio (CMRR), so it can accurately amplify small differential signals from sensors such as bridge circuits without being buried in common-mode noise. Its gain is commonly set with a single resistor.

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