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Question

Which is not the correct relation between different current gain (α,β,γ) of transistor amplifier :-

A
α=ββ+1
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B
β=α1α
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C
β=γ+1
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D
α=βγ
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Solution

The correct options are
A β=α1α
B α=ββ+1
For a transistor amplifier-
β=(ΔICΔIB)VCE= constant
α=(ΔICΔIE)VCB= constant
Also,
ΔIB=ΔIEΔIC
Therefore, β=(ΔICΔIB)=(ΔICΔIEΔIC)=(ΔIC/ΔIE1ΔIC/ΔIE)=α1α
From this we can have, α=β1+β
So, option (A) & (B) both are correct.


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