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Two Port Network Models

Thevenin's theorem is used to model circuits with one port, Figure 54, where

 

v = v_thev - i R_thev . (66)

You can think of v_thev and R_thev as parameters for the one port network. Norton's theorem gives a different set of parameters, i_norton and R_norton.

  

Figure 54: One port network.

 

Now consider the two port network of Figure 55. There are many ways of modelling the relationships amoung v₁, i₁, v₂ and i₂, each model corresponds to a type of two port network model. We will look at impedance and hybrid parameter models, but you should know that there are other types as well.

  

Figure 55: Two port network.

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