ECET 205 Chapter 9: Multistage, CC, and CB Amplifiers

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36 Terms

1
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If the input impedance of the second stage decreases, the voltage gain of the first stage will:
Decrease
2
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If the BE diode of the second stage opens, the voltage gain of the first stage will:
Increase
3
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If the load resistance of the second stage opens, the voltage gain of the first stage will:
Remain The Same
4
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An emitter follower has a voltage gain that is:
Approximately equal to one.
5
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The total AC emitter resistance of an emitter follower equals:
Re + R'e
6
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The input impedance of the base of an emitter follower is usually:
High
7
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The DC current gain of an emitter follower is:
BDC
8
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The AC base voltage of an emitter follower is across the:
Emitter diode and external AC emitter resistance.
9
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The output voltage of an emitter follower is across the:
Load Resistor
10
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If B = 200 and Re = 150 Ohms, the input impedance of the base is:
30k Ohms
11
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The input voltage to an emitter follower is usually:
Less than the generator voltage.
12
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The AC emitter current is closest to:
Vin divided by Re.
13
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The output voltage of an emitter follower is approximately:
Vin
14
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The output voltage of an emitter follower is:
In phase with Vin.
15
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An emitter-follower buffer is generally used when:
RL < RG
16
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For maximum power transfer, a CC amplifier is designed so:
Zout = RL
17
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If a CE stage is directly coupled to an emitter follower:
Low and high frequencies will be passed.
18
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If the load resistance of an emitter follower is very large, the external AC emitter resistance equals:
DC Emitter Resistance
19
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If an emitter follower has R'e = 10 Ohms and Re = 90 Ohms, the voltage gain is approximately:
0.9
20
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An emitter follower circuit always makes the source resistance:
B times smaller.
21
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A Darlington transistor has:
A very high current gain.
22
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The amplifier configuration that produces a 180 degree phase shift is the:
CE Amplifier
23
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If the generator voltage is 5 mV in an emitter follower, the output voltage across the load is closest to:
5 mV
24
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If the load resistor in Fig. 9-6a is shorted, which of the following are different from their normal values:
Only AC voltages.
25
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If R1 is open in an emitter follower, which of these is true?
DC base voltage is zero.
26
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Usually, the distortion in an emitter follower is:
Very Low
27
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The distortion in an emitter follower is:
High when clipping occurs.
28
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If a CE stage is directly coupled to an emitter follower, how many coupling capacitors are there between the two stages?
Zero
29
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A Darlington transistor has a B of 8000. If Re is 1k Ohms and RL is 100 Ohms, the input impedance of the base is closest to:
800k Ohms
30
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The AC emitter resistance of an emitter follower:
Is usually less than the load resistance.
31
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A common base amplifier has a voltage gain that is:
Greater than one.
32
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An application of a common base amplifier is when:
Rsource < RL
33
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A common base amplifier can be used when:
All of the above.
34
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The zener current in a zener follower is:
Smaller than the output current.
35
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In the two-transistor voltage regulator, the output voltage:
All of the above.
36
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When troubleshooting multi-stage amplifiers, begin by:
Signal tracing/injection.