The t-parameters of the two-port networks Na and Nb in Figure P1729 are ta 4

The t-parameters of the two-port networks Na and Nb in Figure P17–29 are ta ½ ¼ 4 25 0:01 4



and tb ½ ¼ 10 500 0:2 10



Find the impedance looking into the input port of Na when a 50-V resistive load is connected across the output port of Nb.

Note: the result in Problem 17–24 will prove useful.