How are Hybrid Pi model and T model interchangeable?
Answer:
The Hybrid-Π model is an equivalent small-signal circuit model for a BJT in the active mode:
Note however, that you can alternatively express the small-signal circuit equations as:
ib = ie - ic
ic = gm x Vbe = B x ib
ie = Vbe / re
These equations likewise describe the T-Model—an alternative but equivalent model to the Hybrid-Π.
The Hybrid-Π and the T circuit models are equivalent—they both will result in the same correct answer!
Therefore, you do not need to worry about which one to use for a particular small-signal circuit analysis, either one will work.
However, you will find that a particular analysis is easier with one model or the other; a result that is dependent completely on the type of amplifier being analyzed.
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