Consider the phase shift oscillator in Figure 15.15.

(a) For \(R=20 \mathrm{k} \Omega\) and \(C=0.001 \mu \mathrm{F}\), determine the frequency of oscillation. What is the required value of \(R_{2}\) ?

(b) Design the circuit such that the frequency of oscillation is \(f_{o}=25 \mathrm{kHz}\). Let \(R=20 \mathrm{k} \Omega\).

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C v (v) o HH ww R ww R A2 102 V3 A3 + + A1 V2 + www R Figure 15.15 Phase-shift oscillator circuit with voltage-follower buffer stages