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R-C Phase Shift Oscillator

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 introduces the phase shift of 180* between input and output.
  • The feedback network consists of 3 RC sections each producing 60* phase shift.

    • Such a RC phase shift oscillator using op-amp

  • the output of amplifier is given to feedback network
  • The output of feedback network drives the amplifer.
  • The total phase shift around a loop is 180* of amplifier and due to 3 RC section, thus 360*
  • this satisfies the required condition for positive feedback and circuits works as an oscillator
  • The gain of the op-amp|A|>=29 to satisfy the magnitude condition hence gain of feedback network is β=1/29 so that |Aβ|=1
  • Thus Barkhausen criteron is satisfied and the circuit works as an oscillator
  • the frequency of oscillator f=1/2π√6 RC Hz

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