CHAPTER 16
OSCILLATORS
1. A circuit that produces a periodic waveform on its output with only the dc supply voltage as an input
Oscillator
2. The two major classifications for oscillators are feedback oscillators and _______________.
Relaxation oscillators
3. Characterized by the condition wherein a portion of the output voltage of an amplifier is fed back to the input with no net phase shift resulting in a reinforcement of the output signal
Positive signal
4. An amplifier gain of greater than ________ will cause the oscillator to limit both peaks of the waveform
100
5. The most widely used type of RC feedback oscillator for frequencies up to about 1 MHz
Wien-bridge
6. Quarts is one type of crystalline substance found in nature that exhibits a property called ________
Piezolelectric effect
7. This type of LC feedback oscillator uses transformer coupling to feed back a portion of the signal voltage. It is sometimes called a “tickler” oscillator
Armstrong Oscillator
8. Devices that produce more than one output function
Function generators
9. A relaxation oscillator whose frequency can be changed by a variable dc control voltage
Voltage-controlled oscillator (VCO)
10. ___________ oscillators include the Colpitts, Clapp, Hartley, Armstrong, and crystal-controlled
Sinusoidal LC
11. ___________ oscillators include the Wien-bridge, phase-shift, and twin-T
Sinusoidal RC
12. This type of oscillator used an LC circuit in the feedback loop to provide the necessary phase shift and to act as a resonant filter that passes only the desired frequency of oscillation
Colpitts Oscillator
13. It is a variation of the Colpitts but with an additional capacitor in series with the inductor in the resonant feedback circuit
Clapp Oscillator
14. He invented the Hartley oscillator and the Hartley transform, a mathematical analysis method , which contributed to the foundations of information theory
Ralph Vinton Lyon Hartley
15. Similar to Colpitts except that the feedback circuit consists of two series inductors and a parallel capacitor
Hartley oscillator
16. The most stable and accurate type of feedback oscillator uses a piezoelectric _________ in the feedback loop to control frequency.
Crystal
17. The lowest frequency at which a crystal is naturally resonant.
Fundamental frequency
18. For higher frequencies, the crystal must be operated in this mode
Overtone mode
19. A type of relaxation oscillator because its operation is based on the charging and discharging of a capacitor
Square-Wave oscillator
20. A two-state device whose output can be at either a high voltage or a low voltage level
Flip-flop
21. For initial start-up, the voltage gain around the feedback loop must be greater that
1 (one)
22. The feedback signal in an Armstrong oscillator is derived by ________ coupling
Transformer
23. A type of RC feedback oscillator which used two T-type RC filters used in the feedback loop, one has a low-pass response and the other has high-pass response
Twin-T oscillator
24. A loop is created in which the signal sustains itself and a continuous sinusoidal output is produces
Oscillation
25. The phase shift around the feedback loop must be effectively ________ degrees to sustain the state of oscillation
0°
26. The voltage gain around the closed feedback loop must be equal to _________ to sustain state of oscillation.
1 (unity)
27. The product of the amplifier gain and the attenuation of the feedback circuit
Voltage gain
28. He was involved in the development of oscillators and vacuum tube push-pull amplifiers at Western Electric in the early 1900
Edwin H. Colpitts
29. The frequency in a VCO can be varied with a _______ controlled voltage
Dc
OSCILLATORS
1. A circuit that produces a periodic waveform on its output with only the dc supply voltage as an input
Oscillator
2. The two major classifications for oscillators are feedback oscillators and _______________.
Relaxation oscillators
3. Characterized by the condition wherein a portion of the output voltage of an amplifier is fed back to the input with no net phase shift resulting in a reinforcement of the output signal
Positive signal
4. An amplifier gain of greater than ________ will cause the oscillator to limit both peaks of the waveform
100
5. The most widely used type of RC feedback oscillator for frequencies up to about 1 MHz
Wien-bridge
6. Quarts is one type of crystalline substance found in nature that exhibits a property called ________
Piezolelectric effect
7. This type of LC feedback oscillator uses transformer coupling to feed back a portion of the signal voltage. It is sometimes called a “tickler” oscillator
Armstrong Oscillator
8. Devices that produce more than one output function
Function generators
9. A relaxation oscillator whose frequency can be changed by a variable dc control voltage
Voltage-controlled oscillator (VCO)
10. ___________ oscillators include the Colpitts, Clapp, Hartley, Armstrong, and crystal-controlled
Sinusoidal LC
11. ___________ oscillators include the Wien-bridge, phase-shift, and twin-T
Sinusoidal RC
12. This type of oscillator used an LC circuit in the feedback loop to provide the necessary phase shift and to act as a resonant filter that passes only the desired frequency of oscillation
Colpitts Oscillator
13. It is a variation of the Colpitts but with an additional capacitor in series with the inductor in the resonant feedback circuit
Clapp Oscillator
14. He invented the Hartley oscillator and the Hartley transform, a mathematical analysis method , which contributed to the foundations of information theory
Ralph Vinton Lyon Hartley
15. Similar to Colpitts except that the feedback circuit consists of two series inductors and a parallel capacitor
Hartley oscillator
16. The most stable and accurate type of feedback oscillator uses a piezoelectric _________ in the feedback loop to control frequency.
Crystal
17. The lowest frequency at which a crystal is naturally resonant.
Fundamental frequency
18. For higher frequencies, the crystal must be operated in this mode
Overtone mode
19. A type of relaxation oscillator because its operation is based on the charging and discharging of a capacitor
Square-Wave oscillator
20. A two-state device whose output can be at either a high voltage or a low voltage level
Flip-flop
21. For initial start-up, the voltage gain around the feedback loop must be greater that
1 (one)
22. The feedback signal in an Armstrong oscillator is derived by ________ coupling
Transformer
23. A type of RC feedback oscillator which used two T-type RC filters used in the feedback loop, one has a low-pass response and the other has high-pass response
Twin-T oscillator
24. A loop is created in which the signal sustains itself and a continuous sinusoidal output is produces
Oscillation
25. The phase shift around the feedback loop must be effectively ________ degrees to sustain the state of oscillation
0°
26. The voltage gain around the closed feedback loop must be equal to _________ to sustain state of oscillation.
1 (unity)
27. The product of the amplifier gain and the attenuation of the feedback circuit
Voltage gain
28. He was involved in the development of oscillators and vacuum tube push-pull amplifiers at Western Electric in the early 1900
Edwin H. Colpitts
29. The frequency in a VCO can be varied with a _______ controlled voltage
Dc
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