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Analog ElectronicsOperational Amplifiers

An ideal inverting op-amp has Rin = 25 kOhm, Rf = 100 kOhm and Vin = -0.5 V. The output is?

  • A-2 V
  • B+2 V
  • C-0.125 V
  • D+0.125 V
Report an error
Correct Answer: B. +2 V
Explanation: Av = -Rf/Rin = -4. Therefore Vo = (-4)(-0.5 V) = +2 V.
Reference: Standard analog electronics: operational amplifiers
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