R-C Phase Shift Oscillator using Op-Amp

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R-C Phase Shift Oscillator using Op-Amp

R-C Phase Shift Oscillator Using Op-Amp

  • R-C phase shift oscillator using op-amp uses in inverting amplifier mode. Thus it introduce the phase shift of 180* between input and output
  • The feedback network consists of 3 RC sections each producing 60* phase shift

    • RC Phase Shift oscillator using op-amp

  • The output of amplifer is given to feedback network.
  • The output of feedback network drives the amplifier and 180* due to 3 RC section, thus 360*.
  • This satisfies the required condition for positive feedback and circuit works as an oscillator.
  • The gain of the op-amp |A|=> to satisfy the magnitude condition hence gain of the feedback network is β=1/29 so that |Aβ|=1
  • Thus Barkhausen criterion is satisfied and the circuit works as an oscillator.
  • The frequency of oscillations is given by,
    • f = 1/2π∠6 RC Hz
Location: India

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