21. Nota
22. Nota
23. The start-up gain of an oscillator must be ________ one.
(a) equal to
(b) less than
(c) greater than
(d) any of these
24. For frequencies up to 1 MHz, the ________ is the most widely used type of sinusoidal RC oscillator.
(a) Wien-bridge
(b) phase-shift
(c) twin-T
(d) none of these
25. The feedback signal in a(n) ________ oscillator is derived from a capacitive voltage divider in the LC circuit.
(a) Hartley
(b) Armstrong
(c) Colpitts
(d) Any of these
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5555555555 80. In the IC phase-shift oscillator, what should the ratio of feedback resistor Rf to R1 be? (a) Zero (b) Greater than –29 (c) Less than 29 (d) Any value- 555555555520. What is the total phase shift requirement, around the feedback loop, for a phase-shift oscillator? (a) 90° (b) 180° (c) 270° (d) 360°
- 5555555555 36. In order to start up, a feedback oscillator requires ________. (a) negative feedback less than 1. (b) positive feedback greater than 1. (c) unity feedback equal to 1. (d) no feedback.
- 5555555555 58. The attenuation of the three-section RC feedback phase-shift oscillator is ________. (a) 1/9. (b) 1/30. (c) 1/3. (d) 1/29.
- 5555555555 59. The feedback signal in a(n) ________ oscillator is derived from an inductive voltage divider in the LC circuit. (a) Hartley (b) Armstrong (c) Colpitts (d) Any of these