This chapter discusses the application of MATLAB for analysis of two-port networks. | Attia John Okyere. Two-Port Networks. Electronics and Circuit Analysis using MATLAB. Ed. John Okyere Attia Boca Raton CRC Press LLC 1999 1999 by CRC PRESS LLC CHAPTER SEVEN TWO-PORT NETWORKS This chapter discusses the application of MATLAB for analysis of two-port networks. The describing equations for the various two-port network representations are given. The use of MATLAB for solving problems involving parallel series and cascaded two-port networks is shown. Example problems involving both passive and active circuits will be solved using MATLAB. TWO-PORT NETWORK REPRESENTATIONS A general two-port network is shown in Figure . Figure General Two-Port Network I2 V2 I1 and V1 are input current and voltage respectively. Also 12 and V2 are output current and voltage respectively. It is assumed that the linear two-port circuit contains no independent sources of energy and that the circuit is initially at rest no stored energy . Furthermore any controlled sources within the linear two-port circuit cannot depend on variables that are outside the circuit. z-parameters A two-port network can be described by z-parameters as V1 z1111 Z1212 V2 z2111 z2212 In matrix form the above equation can be rewritten as 1999 CRC Press LLC V z11 Z12 11 V _ _Z21 Z22 _ 1 U 2 J The z-parameter can be found as follows Z11 y I I2 o 11 Z12 l1 0 1 2 Z21 112 o 11 Z22 111 0 12 The z-parameters are also called open-circuit impedance parameters since they are obtained as a ratio of voltage and current and the parameters are obtained by open-circuiting port 2 12 0 or portl 11 0 . The following example shows a technique for finding the z-parameters of a simple circuit. Example For the T-network shown in Figure find the z-parameters. Z2 Z 11 Figure T-Network 2 1999 CRC Press .
