The equivalent circuit of the h parameter model

________________________________________________________________________________________

Consider the input equation

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

• the voltage across an input resistance h 11 that has the input current

I 1 flowing through it

and • the voltage h 12 V 2 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 I 2 is equal to the sum of a current

produced by the current generator h 21 I 1 and the current due to the voltage V 2

across an output conductance h 22.

The output equivalent circuit will be as

The complete equivalent circuit will be as