The LC oscillator in Fig P1828 is based on connecting a posi

The LC oscillator in Fig. P18.28 is based on connecting a positive-gain amplifier (formed by Q_1, Q_2, and R_c) with a bandpass RLC circuit in a feedback loop. Replace the BJTs with their small-signal models while neglecting r_z and r_D (to simplify matters). By inspection of the circuit found in, find the frequency of oscillation and the condition required for oscillations to start. Express the latter as the minimum required value of (IR_C). If IR_C is selected equal to 1 V, show that oscillations will start. If oscillations grow to the point that V_o is large enough to turn the BJTs on and off, show that the signal at the collector of Q_2 will be a square wave of 1 V peak-to-peak. Estimate the peak-to-peak amplitude of the output sine wave V_o.

Solution

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