THE EQUIVALENT CIRCUIT OF THE h PARAMETER MODEL

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Consider the input equation

This shows the input voltage to be equal to the sum of

• the voltage across an input resistance h11 that has the input current

I1 flowing through it

and • the voltage h12V2 produced by a voltage generator.

The input equivalent circuit will be as

 

Now consider the output equation

This equation tells us that the output current I2 is equal to the sum of a current

produced by the current generator h21I1 and the current due to the voltage V2

across an output conductance h22.

The output equivalent circuit will be as

The complete equivalent circuit will be as