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Analog ElectronicsOperational Amplifiers

An ideal op-amp difference amplifier has matched resistor ratios equal to 5. If V2 = 1.2 V and V1 = 0.4 V, the output is?

  • A-4 V
  • B+4 V
  • C+0.8 V
  • D+8 V
Report an error
Correct Answer: B. +4 V
Explanation: For matched ratios, Vo = 5(V2-V1) = 5(1.2-0.4) = 4 V.
Reference: Standard analog electronics: operational amplifiers
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