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Consider the oscillator circuit shown in the figure. The function of the network (shown in dotted lines) consisting of the 100kΩ resistor in series with the two diodes connected back-to-back is to:
Introduce amplitude Stabilization by preventing the op amp from Saturating and thus producing sinusoidal oscillations affixed amplitude
Introduce amplitude stabilization by forcing the op-amp to swing between positive and negative saturation and thus producing square wave oscillations of fixed amplitude
Introduce frequency stabilization by forcing the circuit to oscillate at a single frequency
Enable the loop gain to take on a value that produces Square wave oscillations
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