BJT Transistor resistance

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Teris

Joined Nov 4, 2017
24
Hello, I would like to know the resistance of current pump βib (on the attached picture).
I think that is 1/β x rπ.
That is right?
 

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LvW

Joined Jun 13, 2013
975
Teris - as mentioned by danadak, the ideal model of a current source has no parallel resistance (source resistance infinite).
However, in order to complete (improve) the model you can add a parallel resistance to the current source.
This resistance is pretty large and can be derived from the inverse slope of the BJT`s output characteristic:
ro=d(Vce)/d(Ic).
 
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