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Transistor Amplifier Configurations Flashcards

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1
Q
A
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2
Q

What is a transistor amplifier?

A

A transistor amplifier is a device that increases the amplitude of a signal using a transistor.

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3
Q

What are the three main configurations of transistor amplifiers?

A

The three main configurations are common emitter, common base, and common collector.

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4
Q

True or False: The common emitter configuration provides high voltage gain.

A

True

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5
Q

Which transistor configuration is known for providing high input impedance?

A

Common collector configuration.

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6
Q

Fill in the blank: The common base configuration has a _____ input and output.

A

current

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7
Q

What type of transistor is commonly used in amplifier configurations?

A

Bipolar Junction Transistor (BJT) or Field Effect Transistor (FET).

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8
Q

What is the primary function of an amplifier?

A

To increase the power of a signal.

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9
Q

In a common emitter amplifier, which terminal is common to both the input and output?

A

Emitter

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10
Q

True or False: The common collector configuration is also known as an emitter follower.

A

True

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11
Q

What is the phase relationship between input and output in a common emitter amplifier?

A

180 degrees out of phase.

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12
Q

Which configuration is typically used in RF amplifiers?

A

Common base configuration.

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13
Q

What is the main advantage of a common collector amplifier?

A

It provides high current gain and low output impedance.

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14
Q

Fill in the blank: The voltage gain of a common base amplifier is typically _____ than one.

A

less

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15
Q

What is the role of biasing in transistor amplifiers?

A

To set the operating point of the transistor.

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16
Q

Which transistor configuration is most commonly used for voltage amplification?

A

Common emitter configuration.

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17
Q

True or False: The common collector configuration is used primarily for voltage amplification.

A

False

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18
Q

What is the input impedance characteristic of a common base amplifier?

A

Low input impedance.

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19
Q

What does the term ‘decibel’ (dB) refer to in amplification?

A

A logarithmic unit used to measure the gain or loss of a signal.

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20
Q

Fill in the blank: In a common emitter amplifier, the output is taken from the _____ terminal.

A

collector

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21
Q

What is a disadvantage of the common emitter configuration?

A

It has a lower input impedance compared to common collector.

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22
Q

True or False: The common collector configuration provides voltage gain.

A

False

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23
Q

Which configuration is best for impedance matching?

A

Common collector configuration.

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24
Q

What is the typical voltage gain of a common base amplifier?

A

Less than one.

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25
Fill in the blank: The gain of a common emitter amplifier can be calculated using the formula _____ .
Av = -Rc/Re
26
What is the function of a coupling capacitor in an amplifier circuit?
To block DC and allow AC signals to pass.
27
True or False: Biasing can be done using resistive or active methods.
True
28
What does the term 'input signal' refer to?
The signal that is fed into the amplifier for processing.
29
Which transistor configuration is typically used in audio amplifiers?
Common emitter configuration.
30
Fill in the blank: The output of a common collector amplifier follows the _____ of the input.
voltage
31
What is the main purpose of feedback in amplifier circuits?
To stabilize gain and improve linearity.
32
True or False: All transistor amplifiers require a power supply.
True
33
What is the effect of negative feedback on amplifier performance?
It reduces gain but improves stability and bandwidth.
34
Fill in the blank: The common base configuration is less commonly used due to its _____ input impedance.
low
35
Which configuration offers the highest voltage gain?
Common emitter configuration.
36
What is the role of a load resistor in an amplifier circuit?
To convert the output current into output voltage.
37
True or False: An amplifier can only amplify AC signals.
False
38
What is the significance of the cutoff frequency in amplifier circuits?
It defines the frequency range over which the amplifier operates effectively.
39
In which configuration does the input signal directly control the output current?
Common emitter configuration.
40
Fill in the blank: The common collector amplifier is also known as a _____ follower.
voltage
41
What is the effect of increasing the collector resistor in a common emitter amplifier?
It increases the voltage gain.
42
True or False: The common base configuration is ideal for voltage amplification.
False
43
What is the relationship between input and output in a common collector amplifier?
Output voltage is nearly equal to input voltage.
44
Fill in the blank: The gain of a common collector amplifier is approximately equal to _____ .
1
45
What is the role of the emitter resistor in a common emitter amplifier?
To stabilize the operating point.
46
True or False: The common collector configuration can provide isolation between stages.
True
47
What is the typical output impedance of a common emitter amplifier?
High output impedance.
48
Fill in the blank: The common base amplifier is typically used in _____ applications.
RF
49
What is the main characteristic of a common emitter amplifier?
It inverts the phase of the input signal.
50
True or False: The common collector configuration is used for power amplification.
True
51
What defines the input characteristics of a transistor amplifier?
The input impedance and biasing conditions.
52
Fill in the blank: The common emitter amplifier can be used for both _____ and _____ applications.
voltage, current
53
What is the primary disadvantage of a common emitter amplifier?
It has a high output impedance.
54
True or False: The common collector amplifier can provide a significant voltage gain.
False
55
What is the function of a bypass capacitor in a transistor amplifier?
To increase the gain by bypassing the emitter resistor at high frequencies.
56
Fill in the blank: In a common base amplifier, the input signal is applied to the _____ terminal.
emitter
57
Which transistor configuration is the most versatile?
Common emitter configuration.
58
True or False: The common base configuration is suitable for low-frequency applications.
False
59
What is the effect of temperature on transistor amplifiers?
It can affect the biasing and performance of the amplifier.
60
Fill in the blank: The voltage gain of a common emitter amplifier is primarily determined by the ratio of _____ resistors.
collector to emitter
61
What is the main use of a common collector amplifier in circuits?
To buffer signals.
62
True or False: All transistor amplifiers can be classified into one of the three configurations.
True
63
What does the term 'output signal' refer to?
The signal that is produced by the amplifier after processing.
64
Fill in the blank: The common emitter configuration is often used in _____ amplifiers.
audio
65
What is the significance of the quiescent point (Q-point) in amplifier design?
It determines the amplifier's operating state without an input signal.
66
True or False: The common collector amplifier can be used to amplify low-level signals.
True
67
What is the primary benefit of using a common base amplifier?
It has a wide bandwidth.
68
Fill in the blank: The common emitter amplifier is characterized by its _____ gain.
high
69
What is the role of the collector current in a common emitter amplifier?
It is the main output current that reflects the input signal variations.
70
True or False: The common collector configuration is primarily used for voltage amplification.
False
71
What is the purpose of the input coupling capacitor?
To block DC from the input signal while allowing AC to pass.
72
Fill in the blank: The output of a common base amplifier is taken from the _____ terminal.
collector
73
Which transistor configuration provides the highest input impedance?
Common collector configuration.
74
True or False: The common emitter amplifier can be used for both signal amplification and switching applications.
True
75
What is the typical gain range for a common emitter amplifier?
10 to 1000.
76
Fill in the blank: The common collector amplifier is often used in _____ applications.
buffering
77
What is the primary characteristic of a common base amplifier?
It has low input impedance and high output impedance.
78
True or False: The common collector configuration can provide isolation for subsequent stages.
True
79
What happens to the gain of a common emitter amplifier if the emitter resistor is increased?
The gain decreases.
80
Fill in the blank: The common base configuration is typically used in _____ frequency applications.
high
81
What is the effect of a negative feedback loop in amplifier circuits?
It stabilizes the gain and reduces distortion.
82
True or False: The common collector configuration is used for impedance matching.
True
83
What is the relationship between the input and output signals in a common emitter amplifier?
The output is inverted relative to the input.
84
Fill in the blank: The common collector amplifier has a gain of approximately _____ .
1
85
What is the main function of a transistor in an amplifier circuit?
To control the output signal based on the input signal.
86
True or False: The common base amplifier can provide high voltage gain.
False

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