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Electronic Devices - Oscillator Circuits

@ : Home > Electronic Devices > Oscillator Circuits > General Questions

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. 90ºB. 180º
C. 270ºD.

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




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