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Solved Problems-14

Problems-14
Find the hybrid parameters for the network of the figure (which represents a transistor).
 
Description: Description: 3691.png
 
Solution
Case (I): When V2 = 0
 
The circuit is modified as shown in the figure.
 
Description: Description: 3698.png
 
By KCL at node x,
Description: Description: 6980.png
 
By KVL,
Description: Description: 6988.png
∴ 
 
By KCL at node y,
 
Description: Description: 7000.png
 
∴  
 
Case (II): When I1 = 0
 
Here, the dependent current source is to be opened (since I1 = 0).
 
The circuit is modified as shown in the figure.
 
Description: Description: 3736.png
 
∴ V2 = I2(R2 + R3)
 
and V1 = I2R2
 
∴ Description: Description: 7015.png
 
and Description: Description: 7021.png
 
Therefore, the hybrid parameters are
 
Description: Description: 7027.png 
 




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