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# Electronic Devices - Oscillator Circuits

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### Exercise

"I do not seek. I find."
- Pablo Picasso
1.

Calculate the value of C1 = C2 for the Wien bridge oscillator to operate at a frequency of 20 kHz. Assume R1 = R2 = 50 k and R3 = 3R4 = 600?

 A. 1.59 pF B. 15.9 pF C. 159 pF D. 1.59 nF

2.

Only the condition A = ________ must be satisfied for self-sustained oscillations to result.

 A. 0 B. –1 C. 1 D. None of the above

3.

At what phase shift is the magnitude of A at its maximum in the Nyquist plot?

 A. 90º B. 180º C. 270º D. 0º

4.

Which of the following improvements is (are) a result of the negative feedback in a circuit?

 A. Lower output impedance B. Reduced noise C. More linear operation D. All of the above

5.

This circuit is a ________ oscillator.

 A. phase-shift B. Wien bridge C. Colpitts D. Hartley