Draw circuit diagram for a NPN-transistor to obtain characteristic curves in common base configuration. Establish a relation between current amplification factors for a transistor in common base and common emitter configuration.

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Solution

Current amplification $(β) = \frac{I_{c}}{I_{B}} (C E c o n f i g u r a t i o n)$
Current amplification $(α) = \frac{I_{c}}{I_{B}} (C E c o n f i g u r a t i o n)$
$α = \frac{I_{c}}{I_{E}}$
$α = \frac{\frac{I_{C}}{I_{B}}}{\frac{I_{E}}{I_{B}}}$
$α = \frac{β}{\frac{I_{B} + I_{C}}{I_{B}}}$
$α = \frac{β}{1 + β}$

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Draw circuit diagram for a NPN-transistor to obtain characteristic curves in common base configuration. Establish a relation between current amplification factors for a transistor in common base and common emitter configuration.

Current amplification (β)=IcIB(CEconfiguration)Current amplification (α)=IcIB(CEconfiguration)α=IcIEα=ICIBIEIBα=βIB+ICIBα=β1+β