8. For the Wien bridge oscillator circuit using op-amp amplifier shown in Fig. 6 with
the circuit values:
a) Determine the resonant frequency of the Wien bridge oscillator with values: R1
= 22 [k?], R2 = 11 [k?], R3 = R4 = 22 [k?], C1 = C1 =0,002 [µF], ±VCC = 12
[V].
b) Give the need for amplitude stabilization of this oscillator.