Transistor Alpha vs Beta-difference between Alpha and Beta
This page on Transistor alpha vs beta describes difference between Alpha and Beta related to transistor.
Current Gain Alpha(α):
It is the ratio of collector current to the emitter current on no load and constant voltages.
Alpha is always less than unity.
alpha = Ic/Ie
Where,
Ic = Collector current variations
Ie = Emitter current variations
Beta(Β):
It is the ratio of collector current to the base current on no load and
constant voltages. Beta has value between 20 to 200 for general purpose
transistors. Beta of 100 refers to flow of 1 electron from base terminal for every 100 number of
electrons flow between Emitter-Collector terminals.
Β = Ic/Ib
Where,
Ib = Base Current variations
Relation between Alpha (α) and Beta (Β)
Β = α/(1-α)
OR
α = Β /(1 + Β)
Other than current gain, voltage gain and power gain are also used.
Voltage Gain = Output Voltage/Input Voltage
Power Gain = Output Power/Input Power
Both Alpha (α) and Beta (Β) are related to CE (common emitter) mode of transistor as shown in the figure-1 above.
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