Comparison of CB, CC & CE
Configuration
Characteristics
CB
CE
CC
Input Resistance
low (about 100 Ω)
Medium ( 800 Ω to
few KΩ)
High (about 750kΩ)
Output Resistance
Very High (about
500kΩ)
High (about 50kΩ)
Low ( about 50Ω)
Input Current
IE
IB
IB
Output Current
IC
IC
IE
Input Voltage
applied between
E&B
B&E
B&C
O/p Voltage taken
between
C&B
C&E
E&C
Current gain
α = IC/IE (less than unity, β = IC/IB (High, 25 to
0.95 to 0.99)
400)
ϒ = IE/IB (High)
Voltage gain
Power gain
About 150
Medium
About 500
High
Less than unity
Medium
Output Signal phase In phase with input
Reverse (1800 )
In phase with input
Application
For Audio Frequency
Circuits
For impedance
matching
Common Terminal
Leakage Current
For high Frequency
Circuits
Base
Very Small
Emitter
Very Large
Collector
Very Large