Page 979 - Basic Electrical Engineering
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Figure 14.18 Common-emitter, common-collector, and common-base configurations of n–p–n and
p–n–p transistors
From the characteristics, it is seen that for a small change in base current
(in μA) there is a large change (in mA) in collector current and emitter
current. The current gain from the base to the collector can be stated as
Thus, the transistor can be used as a current-amplication device.
The voltage gain, A of the transistor is defined as the ratio of output
V
voltage to input voltage.
