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Q. What are the Current relations in common emitter configuration?
In a CB configuration Ie is the input current and Ic is the output current. These currents are relayed through the equations given below
Ie=Ic+Ib
Ic=IIe+Icb0
In CE configuration, Ib becomes the input current and the Ic is the output current. We are interested in knowing how the output Ic is related with the input current Ib. That is, we should find a relation such as
Ic = f(Ib)
To obtain the relation, we simply substitute the expression of Ie from the equations given earlier,so that
Ic = IDc(Ic+Ib) + Icbo
or
(1-Idc)Ic=IdcIb+Icbo
Ic = (Idc/(1-Idc))Ib+(1/(1-Idc))Icbo
In thjis equation,Ic is given in terms of Ib. The equations can be simplified somewhat by defining
? Idc/(1-Idc)
and
Iceo=Icbo/(1-Idc)
thus equation becomes
Ic=?dcIb+Iceo
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