___________________________________________________________________________ Transistors
To summarize the properties of the three transistor configurations, a comparison chart is
provided in Table 2-1 for your convenience.
Table 2-1. Transistor Configuration Comparison Chart
AMPLIFIER
COMMON
COMMON
COMMON
TYPE
BASE
EMITTER
COLLECTOR
INPUT/OUTPUT PHASE
0o
180o
0o
RELATIONSHIP
VOLTAGE GAIN
HIGH
MEDIUM
LOW
LOW (α)
MEDIUM (β)
HIGH (γ)
CURRENT GAIN
POWER GAIN
LOW
HIGH
MEDIUM
INPUT RESISTANCE
LOW
MEDIUM
HIGH
OUTPUT RESISTANCE
HIGH
MEDIUM
LOW
2-84. Now that we have analyzed the basic transistor amplifier in terms of bias, class of
operation, and circuit configuration, let us apply what has been covered to Figure 2-14. For
your convenience, Figure 2-19 is a reproduction of Figure 2-14.
Figure 2-19. Reproduction of Figure 2-14
23 June 2005
TC 9-62
2-25
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