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Review For Board Exam > OSCILLATORS > Flashcards

OSCILLATORS Flashcards

1
Q

Is a circuit that generates alternating current at a frequency determined by the values of its components.

A

-OSCILLATOR

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2
Q

Produces by using a positive feedback with a transistor, electron tube, magnetic amplifier or other amplifying device.

A

-OSCILLATOR

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3
Q

How these oscilliations are maintained?

A

BY DRAWING THE POWER FROM A BETTERY OR OTHER SOURCE POWER.

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4
Q

If BA ≤ 1, the output signal (oscillation) dies out.

A

-CONDITION 1

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5
Q

If BA < 1, the output signal builds up (osallation starts to grow).

A

-CONDITION 2

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6
Q

If BA = 1, the output signal level is fixed in
amplitude (sell- sustained oscilation).

A

-CONDITION 3

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7
Q

Is a parallel LC circuit that is capable of producing ac signal when excited by an external dc source.

A

-THE TANK CIRCUIT

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8
Q

The repetitive exchange of energy between the capacitor and the inductor is called the

A

-FLYWHEEL EFFECT

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9
Q

Common types of oscillators

A
  1. LC oscillators
    a. Hartley Oscillator
    b. Colpitts Oscillator
    c. Clapp Oscilattor
  2. Crystal Oscillators
    a. Pierce Crystal Oscillator
    b. Hartley Crystal Oscillator
    c. Colpitts Crystal Oscillator
  3. RC Oscillators
    a. Phase-Shift Oscillator
    b. Wen-Bridge Oscillator
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10
Q

Has two inductors a capacitor (L1, L2, and C) on its feedback network.

A

-THE HARTLEY OSCILLATOR

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11
Q

The three distinct types of Hartley oscillators are

A
  1. two coils L1 and 2 are uncoupled
  2. two independent coils with mutual coupling (L1, L2 with M)
  3. two parts of a single tapped coil
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12
Q

Widely used in signal generators operating in the frequency range about 100kHz to 500MHz.

A

-THE COLPITTS OSCILLATOR

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13
Q

It is composed of an inductor and capacitor in series such that the net reactance is inductive. This oscillator circuit provides a greater degree of stability compared to colpitts and hartley oscillator.

A

-THE CLAPP OSCILLATOR

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14
Q

Provides a very stable oscillation. The frequency drfit of crystal oscillator is only 0.0001% (1ppm) compared to 0.8% of LC osccilators/

A

-THE CRYSTAL OSCILLATOR

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15
Q

Types of crystal

A
  1. Rochelle salt crystal
  2. Tourmaline crystal
  3. Quartz crystal
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16
Q

Has the greatest piezoelectric activity therefore the weakest.

A

-ROCHELLE SALT CRYSTAL

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17
Q

Has the least piezoelectric activity therefore the strongest and the most expensive.

A

-TOURMALINE CRYSTAL

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18
Q

Has a characteristic that is midway between rochelle salt crystal and tourmaline crystal.

A

-QUARTZ CRYSTAL

19
Q

Generation of a voltage between opposite faces of a crystal as a result of strain due to pressure or twisting and the reverse effect in which application of a voltage to opposite faces causes deformation.

A

-THE PIEZOELECTRIC EFFECT

20
Q

It is inversely related to the thickness. Therefore, the thicker the crystal the lower is its what?

A

-FREQUENCY OF VIBRATION

21
Q

Represent electrical equivalent of crystals mass and compliance.

A

-L AND Cs

22
Q

Shunt capacitance represents the capacitance due to mechanical mounting of the crystal.

A

-Cm

23
Q

electrical equivalent of the crystal structure internal friction

A

-R

24
Q

A resonance, the reactance of the series branch is zero.

A

-SERIES RESONANT FREQUENCY

25
Q

A resonance, the reactance of the crystal approaches infinity.

A

-PARALLEL RESONANT FREQUENCY

26
Q

Basically a colpitts oscillator in which the inductor is replaced by a crystal.

A

-PIERCE CRYSTAL OSCILLATOR

27
Q

Is a tuned circuit oscillator using a piezoelectric crystal as a resonant tank circuit.

A

-CRYSTAL OSCILLATOR

28
Q

Is a vibration of a crystal from corner to corner.

A

-SHEAR

29
Q

Is a vibration of a crystal from end to end.

A

-LONGITUDINAL

30
Q

Is a vibration of a crystal in twisting movement.

A

-TORSIONAL

31
Q

Is cutting perpendicular to the end to end.

A

-X CUT

32
Q

Is cutting perpendicular to the face to face axis.

A

-Y CUT

33
Q

It is an oscillator circuit that used three RC lead or lag sections in cascade, each with the same constant where at the frequency of oscillation. It is most often used to generate low-frequency sinusoidal signals for testing purposes.

A

-RC PHASE-SHIFT OSCILLATOR

34
Q

Has one lead and one lag circuit in the feedback path and is using a non-inverting amplifier. It operates in the frequency range of 5Hz to 500kHz.

A

-WIEN BRIDGE OSCILLATOR

35
Q

Is a relaxation oscillator ciruit that uses two active components that are coupled such that one of the components is conducting, while the other one is cut-off.

A

-MULTIVIBRATORS

36
Q

Two classifications of multivibrations

A
  1. Self-excited
  2. Driven multivribator
37
Q

Multivibrator which requires no external triggering

A

-SELF EXCITED

38
Q

That requires an external triggering to excite the circuit and maintain the excitation.

A

-DRIVEN MULTIVIBRATOR

39
Q

The two states

A
  1. Stable state
  2. Quasi-stable state
40
Q

A state that will not change unless the circuit is disturbed.

A

-STABLE STATE

41
Q

A state that remains unchanged for only a certain period of time.

A

-QUASI-STABLE STATE

42
Q

This is commonly known as flip-flop. It has two stable states and no quasi stable state.

A

-BISTABLE BINARY MULTIVIBRATOR

43
Q

This is also known as single-shot or one-shot multivibrator. It has one stable states and one quasi stable state.

A

-MONOSTABLE MULTIVIBRATOR

44
Q

Also known as free running. It has no stable states but has two quasi stable state.

A

-ASTABLE VIBRATOR

Review For Board Exam (17 decks)

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