# Thevenin Equivalent Circuit of Two-Port (Transmission Matrix)

The question is to calculate the thevevin equivalent of the following two port network described by the transmission matrix [A B] [C D]

The way I approached this was from the transmission matrix we know that $$V_1 =AV_{th} - BI_2$$ $$I_1 =CV_{th} -DI_2$$

Now, to find open circuit thevenin voltage source, we open circuit right side, making $$I_2 = 0$$ Subbing this back in to the first equations, $$V_1 = AV_{th}$$ $$I_1 = CV_{th}$$

I'm not sure where to go with this now?

• A HW problem with work shown!? A Christmas Miracle! – Bort Dec 12 '17 at 16:00