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Wien Bridge Oscillator

Wien Bridge Oscillator

Wien Bridge Oscillator

  • A basic wien bridge and an amplifier
  • The output of the amplifier is applied between the teriminals 1 and 3, which is the input to the feedback network
  • While the amplifier input is supplied from the diagonal terminals 2 and 4, which is the output from the feedback network
  • Thus amplifier supplies its own input through the wien bridge as a feedback network
  • The 2 arms of the bridge, namely R1,C1 in series and R2,C2 in parallel are called frequency sensitive arms. This is because the camponents of these two ars deside the frequency of the oscillator. Such a feedback network is called lead-lag network. This is because at very low frequencies it acts like a lead while at very high frequencies it acts like lag network

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