1. Refer to the given figure. The resonant frequency is controlled by
2. Refer to this figure. Determine the resonant frequency.
3. The feedback signal in a(n) ________ oscillator is derived from an inductive voltage divider in the LC circuit.
4. Given gm = 5000 S, rd = 40 k, R = 10 k, and A = 35. Determine the value of RD for oscillator operation at 1 kHz.
5. The attenuation of the three-section RC feedback phase-shift oscillator is
6. Referring to this figure, calculate the voltage gain without feedback for the following circuit values: RD = 4 k, RS = 1 k, RF = 15 k, and gm = 5000 μS.
7. For a phase-shift oscillator, the gain of the amplifier stage must be greater than ________.
8. Which of the following is (are) the determining factor(s) of the stability of a feedback amplifier?
9. What is the minimum frequency at which a crystal will oscillate?
10. An amplifier with a gain of –500 and a feedback of = –0.1 has a gain change of 15% due to temperature. Calculate the change in gain of the feedback amplifier.
11. The feedback signal in a(n) ________ oscillator is derived from a capacitive voltage divider in the LC circuit.
12. Refer to this figure. This circuit is
13. This circuit is a ________ oscillator.
14. Sinusoidal oscillators operate with ________ feedback.
15. Referring to this figure, calculate the voltage gain with the feedback for the following circuit values: RD = 4 k, RS = 1 k, RF = 15 k, and gm = 5000 μS.
16. Refer to this figure. Calculate the resonant frequency.
17. Which of the following is required for oscillation?
18. A circuit that can change the frequency of oscillation with an application of a dc voltage is sometimes called
19. In order to start up, a feedback oscillator requires
20. Refer to this figure. If C1 increases in value, the resonant frequency will
21. What is the ratio of the input impedance with series feedback to that without feedback?
22. The amplifier is unstable if the Nyquist curve plotted encloses (encircles) the –1 point, and it is stable otherwise.
23. Which of the following oscillators is (are) tuned oscillators?
24. What is the ratio of the output impedance with series feedback to that without feedback?
25. Refer to the given figure. This circuit is known as