GATE Electronics and Communications (EC) 2016 Shift 1 Solved Paper

Question : 25 of 65

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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 kΩ 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 of fixed amplitude
introduce amplitude stabilization by forcing the opamp 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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