Op-Amp as Inverting Amplifier

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Inverting amplifier using op-amp

Inverting Amplifier

  • An amplifire which gives 180' phase different between input and output is called inverting amplifier
  • The block diagram of inverting amplifier
  • By the virtual ground concept the two input terminals are always at the same potential
  • As node B is grounded and also node A is at ground potential, from virtual ground concept
    • I=Vin-Va/R1=Vin/R1 (as Va=0)....................equation (1)
  • The op-amp input current is always zero hence entire current flows through the feedback resister Rf
  • from output side
    • I=Va-V0/Rf=-V0/Rf (as Va=0)..........................equation (2)
  • from equation 1 and 2
    • Vin/R1=-V0/Rf Av=-Rf/R1
  • -Rf/R1 is the gain of the amplitude while negative sine indicates that the polarity of the output is opposite of the input hence this called inverting amplifier
  • inverting amplifier waveforms

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