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Consider the oscillator circuit shown in the figure. The function of the network (shown in dotted lines) consisting of the $100 \: k \Omega$ resistor in series with the two diodes connected back-to-back is to:

 

  1. introduce amplitude stabilization by preventing the op amp from saturating and thus producing sinusoidal oscillations of fixed amplitude.
  2. introduce amplitude stabilization by forcing the opamp to swing between positive and negative saturation and thus producing square wave oscillation of fixed amplitude.
  3. introduce frequency stabilization by forcing the circuit to oscillate at a single frequency.
  4. enable the loop gain to take on a value that produces square wave oscillations.
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