# Solved Problems-7

Problems-7
Calculate the T-parameters for the block A and B separately and then using these results, calculate the T-parameters of the whole circuit shown in the figure. Prove any formula used.
Solution
1. We consider the given network as a cascade connection of two networks as shown.

For Block A:

Opening the port-2,

By KCL,
and

Solving for V1 and V2,

V1 =

Short-circuiting port-2,

âˆ´ I1 =

and V1 =

and Da =

For Block B:

Opening the port-2,

By KCL,

and

Solving for V1 and V2,

V1 =

Short-circuiting port-2,

âˆ´ I1 =

and V1 =

and Db =

Since the two networks are connected in cascade, the overall transmission parameter matrix is obtained as,
[T] =  =
1. [Same as Prob. (a)]
Here, [Ta] =

âˆ´ [T] =