hi
i m having trouble to make sense of common emitter config.
first,
the book says for a common-base config the base-emitter is forward biased while collector-base is reversed & so with common emitter config.
& go on to derive Iceo based on above statement.
Iceo= Icbo/(1-α) where Iceo is collector-emitter reversed current when Ib=0, Icbo is collector-base reversed current when Ie=0.
shouldnt common emitter config has collector-emitter reversed?
i think Icbo doesnt belong to common emitter config as that implies Ie=0 which is not the case.
i dun understand why he used the common base config parameters to derive Iceo that is for common emitter which clearly has collector-emitter reverse biased.
my assumption for Iceo.
Ic = αIe + Iceo
Iceo = Ic - αIe
=Ic - α(Ic + Ib)
rearrange, Ic = (Iceo+αIb)/(1-α)
Iceo= Ic(1-α)-αIb
when Ib=0
Iceo= Ic(1-α)
is that a right assumption?
thanks
stupid
i m having trouble to make sense of common emitter config.
first,
the book says for a common-base config the base-emitter is forward biased while collector-base is reversed & so with common emitter config.
& go on to derive Iceo based on above statement.
Iceo= Icbo/(1-α) where Iceo is collector-emitter reversed current when Ib=0, Icbo is collector-base reversed current when Ie=0.
shouldnt common emitter config has collector-emitter reversed?
i think Icbo doesnt belong to common emitter config as that implies Ie=0 which is not the case.
i dun understand why he used the common base config parameters to derive Iceo that is for common emitter which clearly has collector-emitter reverse biased.
my assumption for Iceo.
Ic = αIe + Iceo
Iceo = Ic - αIe
=Ic - α(Ic + Ib)
rearrange, Ic = (Iceo+αIb)/(1-α)
Iceo= Ic(1-α)-αIb
when Ib=0
Iceo= Ic(1-α)
is that a right assumption?
thanks
stupid
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