Comparison of CC, CE and CB Configuration of Transistor

Comparison of Transistor Configurations

Parameter	Common Base	Common Emitter	Common Collector
Current Amplification Factor	α = ∆IC / ∆IE	β = ∆IC / ∆IB	γ = ∆IE / ∆IB
Value of Current Amplification factor	Less than unity	Greater than unity ( between 20 to 500 )	Greater than unity
Voltage gain	Less than 150	Greater than 500	Less than unity
Current gain	Less than unity	High	Appreciable
Input Resistance	Low	Low but higher than Common base configuration	Very high in terms of kilo ohm
Output Resistance	Very high in terms of kilo ohm	High	Low ( less than 100 )
Applications	High frequency applications	Audio frequency applications	Impedance matching

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