TwoPort Networks Admittance Parameters CHAPTER16 THE LEARNING GOALS FOR THIS CHAPTER ARE THAT STUDENTS SHOULD BE ABLE TO:


 Mervyn Waters
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1 CHAPTER16 TwoPort Networks THE LEARNING GOALS FOR THIS CHAPTER ARE THAT STUDENTS SHOULD BE ABLE TO: Calculate the admittance, impedance, hybrid, and transmission parameter for twoport networks. Convert between admittance, impedance, hybrid, and transmission parameters. Describe the interconnection of twoport networks to form more complicated networks. AN EXPERIMENT THAT HELPS STUDENTS DEVELOP AN UNDERSTANDING OF THE MODELS USED FOR TWOPORT NETWORKS IS: Impedance Transmission Parameters: Impedance parameters for twoport networks for several circuits are determined analytically and from results obtained from PSpice. Measurements of the impedance parameters are performed on real circuits. We say that the linear network in Fig. 16.1a has a single portthat is, a single pair of terminals. The pair of terminals AB that constitute this port could represent a single element (e.g., R, L, or C), or it could be some interconnection of these elements. The linear network in Fig. 16.1b is called a twoport. As a general rule, the terminals AB represent the input port and the terminals CD represent the output port. In the twoport network shown in Fig. 16., it is customary to label the voltages and currents as shown; that is, the upper terminals are positive with respect to the lower terminals, the currents are into the twoport at the upper terminals and, because KCL must be satisfied at each port, the current is out of the twoport at the lower terminals. Since the network is linear and contains no independent sources, the principle of superposition can be applied to determine the current, which can be written as the sum of two components, one due to and one due to. Using this principle, we can write 16.1 Admittance Parameters = y 11 y 1 where y 11 and y 1 are essentially constants of proportionality with units of siemens. In a similar manner can be written as = y 1 y 161 c16twoportnetworks.indd 1
2 16 CHAPTER 16 TWOPORT NETWORKS Figure 16.1 A A C (a) Singleport network; (b) twoport network. Linear network Linear network B B D (a) (b) Figure 16. Generalized twoport network. Linear network Therefore, the two equations that describe the twoport network are or in matrix form, = y 11 y 1 = y 1 y [ = [ y 11 y 1 y 1 y [ Note that subscript 1 refers to the input port and subscript refers to the output port, and the equations describe what we will call the Y parameters for a network. If these parameters y 11, y 1, y 1, and y are known, the input/output operation of the twoport is completely defined. From Eq. (16.1), we can determine the Y parameters in the following manner. Note from the equations that y 11 is equal to divided by with the output shortcircuited (i.e., = 0). y 11 = 16. = 0 Since y 11 is an admittance at the input measured in siemens with the output shortcircuited, it is called the shortcircuit input admittance. The equations indicate that the other Y parameters can be determined in a similar manner: y 1 = V1 = 0 y 1 = 16.3 V = 0 y = V1 = 0 y 1 and y 1 are called the shortcircuit transfer admittances and y is called the shortcircuit output admittance. As a group, the Y parameters are referred to as the shortcircuit admittance parameters. Note that by applying the preceding definitions, these parameters could be determined experimentally for a twoport network whose actual configuration is unknown c16twoportnetworks.indd
3 SECTION 16.1 ADMITTANCE PARAMETERS 163 We wish to determine the Y parameters for the twoport network shown in Fig. 16.3a. Once these parameters are known, we will determine the current in a 4Ω load, which is connected to the output port when a A current source is applied at the input port. From Fig. 16.3b, we note that Therefore, = ( ) EXAMPLE 16.1 SOLUTION As shown in Fig. 16.3c, y 11 = 3 S = 3 Ω 3 Ω = 0 (a) (b) = 0 3 Ω A 3 Ω 4 Ω (c) (d) Figure 16.3 Networks employed in Example and hence, y 1 = 1 S Also, y 1 is computed from Fig. 16.3b using the equation and therefore, = y 1 = 1 S c16twoportnetworks.indd 3
4 164 CHAPTER 16 TWOPORT NETWORKS Finally, y can be derived from Fig. 16.3c using and ) = ( y = 5 6 S Therefore, the equations that describe the twoport itself are = 3 1 = These equations can now be employed to determine the operation of the twoport for some given set of terminal conditions. The terminal conditions we will examine are shown in Fig. 16.3d. From this figure, we note that = A and = 4 Combining these with the preceding twoport equations yields or in matrix form [ = = [ V1 1 = [ 0 Note carefully that these equations are simply the nodal equations for the network in Fig. 16.3d. Solving the equations, we obtain = 8 11 V and therefore = 11 A. LEARNING ASSESSMENTS E16.1 Find the Y parameters for the twoport network shown in Fig. E Ω y 11 = 1 14 S; y 1 = y 1 = 1 1 S; y = 1 7 S. Figure E16.1 E16. If a 10A source is connected to the input of the twoport network in Fig. E16.1, find the current in a 5Ω resistor connected to the output port. = 4.9 A. c16twoportnetworks.indd 4
5 SECTION 16. IMPEDANCE PARAMETERS 165 E16.3 Find the Y parameters for the twoport network shown in Fig. E y 11 = 8. μs; y 1 = 704 ns; y 1 = 16.9 ms; y = 7.74 μs. 500 Ω 50 Ω 0 kω Figure E16.3 Once again, if we assume that the twoport network is a linear network that contains no independent sources, then by means of superposition we can write the input and output voltages as the sum of two components, one due to and one due to : = z 11 z = z 1 z These equations, which describe the twoport network, can also be written in matrix form as 16. Impedance Parameters [ = [ z 11 z 1 z 1 z [ 16.5 Like the Y parameters, these Z parameters can be derived as follows: z 11 = I = 0 z 1 = I1 = z 1 = I = 0 z = I1 = 0 In the preceding equations, setting or = 0 is equivalent to opencircuiting the input or output port. Therefore, the Z parameters are called the opencircuit impedance parameters. z 11 is called the opencircuit input impedance, z is called the opencircuit output impedance, and z 1 and z 1 are termed opencircuit transfer impedances. We wish to find the Z parameters for the network in Fig. 16.4a. Once the parameters are known, we will use them to find the current in a 4Ω resistor that is connected to the output terminals when a 1 0 V source with an internal impedance of 1 j0 Ω is connected to the input. From Fig. 16.4a, we note that z 11 = j4 Ω z 1 = j4 Ω z 1 = j4 Ω z = j4 j = j EXAMPLE 16. SOLUTION c16twoportnetworks.indd 5
6 166 CHAPTER 16 TWOPORT NETWORKS j j j4 Ω 1 0 V j4 Ω 4 Ω (a) (b) Figure 16.4 Circuits employed in Example 16.. The equations for the twoport network are, therefore, = ( j4) j4 = j4 j The terminal conditions for the network shown in Fig. 16.4b are = 1 0 (1) = 4 Combining these with the twoport equations yields 1 0 = (3 j4) j4 0 = j4 (4 j) It is interesting to note that these equations are the mesh equations for the network. If we solve the equations for, we obtain = A, which is the current in the 4Ω load. LEARNING ASSESSMENTS E16.4 Find the Z parameters for the network in Fig. E16.4. Then compute the current in a 4Ω load if a 1 0 V source is connected at the input port. = A. 1 3 Ω 6 Ω Figure E16.4 E16.5 Determine the Z parameters for the twoport network shown in Fig. E16.5. z 11 = 15 Ω; z 1 = 5 Ω; z 1 = 5 j8 Ω; z = 5 j4 Ω. 10 Ω 5 Ω j4 Ω Figure E16.5 c16twoportnetworks.indd 6
7 SECTION 16.3 HYBRID PARAMETERS 167 Under the assumptions used to develop the Y and Z parameters, we can obtain what are commonly called the hybrid parameters. In the pair of equations that define these parameters, and are the independent variables. Therefore, the twoport equations in terms of the hybrid parameters are or in matrix form, = h 11 h 1 = h 1 h 16.7 [ = [ h 11 h 1 h 1 h [ 16.8 These parameters are especially important in transistor circuit analysis. The parameters are determined via the following equations: h 11 = V = 0 h 1 = I1 h 1 = = 0 I1 V = 0 h = I1 = 0 The parameters h 11, h 1, h 1, and h represent the shortcircuit input impedance, the opencircuit reverse voltage gain, the shortcircuit forward current gain, and the opencircuit output admittance, respectively. Because of this mix of parameters, they are called hybrid parameters. In transistor circuit analysis, the parameters h 11, h 1, h 1, and h are normally labeled h i, h r, h f, and h o Hybrid Parameters An equivalent circuit for the opamp in Fig. 16.5a is shown in Fig. 16.5b. We will determine the hybrid parameters for this network. Parameter h 11 is derived from Fig. 16.5c. With the output shorted, h 11 is a function of only R i, R 1, and R and h 11 = R i R 1 R R 1 R EXAMPLE 16.3 SOLUTION V i R R R i R o R 1 R 1 AV i (a) (b) V i R V i I1 = 0 R R i R o R i R o R 1 AV i = 0 R 1 AV i (c) (d) Figure 16.5 Circuits employed in Example c16twoportnetworks.indd 7
8 168 CHAPTER 16 TWOPORT NETWORKS Fig. 16.5d is used to derive h 1. Since = 0, V i = 0 and the relationship between and is a simple voltage divider: = R 1 R 1 R Therefore, R h 1 = 1 R 1 R KVL and KCL can be applied to Fig. 16.5c to determine h 1. The two equations that relate to are V i = R i Therefore, = AV i I 1 R 1 R 1 R R o R 1 R 1 R ) h 1 = ( AR i R o Finally, the relationship between and in Fig. 16.5d is and therefore, = R o ( R 1 R ) R o R 1 R h = R o R 1 R R o ( R 1 R ) The network equations are, therefore, = ( R i R 1 R R R 1 R ) 1 R 1 R = ( AR i R 1 R o R 1 R ) R o R 1 R R o ( R 1 R ) LEARNING ASSESSMENTS E16.6 Find the hybrid parameters for the network shown in Fig. E16.4. h 11 = 14 Ω; h 1 = 3 ; h 1 = 3 ; h = 1 9 S. E16.7 If a 4Ω load is connected to the output port of the network examined in Learning Assessment E16.6, determine the input impedance of the twoport with the load connected. Z i = 15.3 Ω. E16.8 Find the hybrid parameters for the twoport network shown in Fig. E16.3. h 11 = Ω; h 1 = ; h 1 = 59.85; h = μs. c16twoportnetworks.indd 8
9 SECTION 16.4 TRANSMISSION PARAMETERS 169 The final parameters we will discuss are called the transmission parameters. They are defined by the equations or in matrix form, = A B = C D [ = [ A C B D [ These parameters are very useful in the analysis of circuits connected in cascade, as we will demonstrate later. The parameters are determined via the following equations: A = I =0 B = V = C = I =0 D = V =0 A, B, C, and D represent the opencircuit voltage ratio, the negative shortcircuit transfer impedance, the opencircuit transfer admittance, and the negative shortcircuit current ratio, respectively. For obvious reasons, the transmission parameters are commonly referred to as the ABCD parameters Transmission Parameters We will now determine the transmission parameters for the network in Fig Let us consider the relationship between the variables under the conditions stated in the parameters in Eq. (16.1). For example, with = 0, can be written as V = jω ( jω) 1 or A = = 1 jω I =0 Similarly, with = 0, the relationship between and is V = 1 1 jω 1 jω ( 1 1 jω) jω or B = = jω In a similar manner, we can show that C = jω and D = 1 jω. EXAMPLE 16.4 SOLUTION 1 F Figure 16.6 Circuit used in Example c16twoportnetworks.indd 9
10 1610 CHAPTER 16 TWOPORT NETWORKS LEARNING ASSESSMENTS E16.9 Compute the transmission parameters for the twoport network in Fig. E16.1. A = 3; B = ; C = 1 6 S; D = 3. E16.10 Find the transmission parameters for the twoport network shown in Fig. E16.5. A = j1.348; B = 4.61 j3.37 Ω; C = j0.09 S; D = 0.64 j0.5. E16.11 Find V s if = 0 0 V rms in the network shown in Fig. E V s = V rms. j 5:1 V s Twoport network 10 kva 0.8 lag Figure E16.11 Ideal [ [ = j0.333 j (1.333 j6) (0.333 j0.333) [ 16.5 Parameter Conversions If all the twoport parameters for a network exist, it is possible to relate one set of parameters to another since the parameters interrelate the variables,,, and. Table 16.1 lists all the conversion formulas that relate one set of twoport parameters to another. Note that Z, Y, H, and T refer to the determinants of the matrices for the Z, Y, hybrid, and ABCD parameters, respectively. Therefore, given one set of parameters for a network, we can use Table 16.1 to find others. TABLE 16.1 Twoport parameter conversion formulas y y 1 [ z 11 z 1 z 1 z [ Y Y y 1 y 11 Y Y [ A C 1 C [ z Z z 1 Z [ z11 z 1 1 z 1 z 1 Z z z 1 z 11 Z z z 1 [ [ Z z z 1 1 z z z 1 z [ y11 y 1 y 1 y y 1 y y 1 [ 1 y 11 y 1 y 11 y [ D 1 y 1 y 11 y 1 y 1 y 11 Y y 11 B 1 B [ A C [ B D 1 D T C D C T B A B [ [ B D [ T D C D H h 1 h h h 1 1 h h 1 h 1 h 11 h 11 h 1 H h 11 h 11 H h 1 h h 1 h 11 h 1 1 h 1 [ h11 h 1 h 1 h c16twoportnetworks.indd 10
11 SECTION 16.6 INTERCONNECTION OF TWOPORTS LEARNING ASSESSMENT E16.1 Determine the Y parameters for a twoport if the Z parameters are Z = [ y 11 = 1 14 S; y 1 1 = y 1 = 1 S; y = 1 7 S.. Interconnected twoport circuits are important because when designing complex systems it is generally much easier to design a number of simpler subsystems that can then be interconnected to form the complete system. If each subsystem is treated as a twoport network, the interconnection techniques described in this section provide some insight into the manner in which a total system may be analyzed and/or designed. Thus, we will now illustrate techniques for treating a network as a combination of subnetworks. We will, therefore, analyze a twoport network as an interconnection of simpler twoports. Although twoports can be interconnected in a variety of ways, we will treat only three types of connections: parallel, series, and cascade. For the twoport interconnections to be valid, they must satisfy certain specific requirements that are outlined in the book Network Analysis and Synthesis by L. Weinberg (McGraw Hill, 196). The following examples will serve to illustrate the interconnection techniques. In the parallel interconnection case, a twoport N is composed of twoports N a and N b connected as shown in Fig Provided that the terminal characteristics of the two networks N a and N b are not altered by the interconnection illustrated in the figure, then the Y parameters for the total network are 16.6 Interconnection of TwoPorts [ y 11 y 1 y 1 y = [ y 11a y 11b y 1a y 1b y 1a y a y 1b y b and hence to determine the Y parameters for the total network, we simply add the Y parameters of the two networks N a and N b. Likewise, if the twoport N is composed of the series connection of N a and N b, as shown in Fig. 16.8, then once again, as long as the terminal characteristics of the two a a N a a y11a y1a a y1a ya Figure 16.7 Parallel interconnection of twoports. b b N b b y11b y1b y1b yb b a a Figure 16.8 a N a a Series interconnection of twoports. I 1b b b N b b c16twoportnetworks.indd 11
12 161 CHAPTER 16 TWOPORT NETWORKS Figure 16.9 Cascade interconnection of networks. a a b a a N a a b N b b networks N a and N b are not altered by the series interconnection, the Z parameters for the total network are [ z 11 z 1 z 1 z = [ z 11a z 11b z 1a z 1b z 1a z 1b z a z b Therefore, the Z parameters for the total network are equal to the sum of the Z parameters for the networks N a and N b. Finally, if a twoport N is composed of a cascade interconnection of N a and N b, as shown in Fig. 16.9, the equations for the total network are [ = [ A a C a B a D a [ A b C b B b D b [ Hence, the transmission parameters for the total network are derived by matrix multiplication as indicated previously. The order of the matrix multiplication is important and is performed in the order in which the networks are interconnected. The cascade interconnection is very useful. Many large systems can be conveniently modeled as the cascade interconnection of a number of stages. For example, the very weak signal picked up by a radio antenna is passed through a number of successive stages of amplificationeach of which can be modeled as a twoport subnetwork. In addition, in contrast to the other interconnection schemes, no restrictions are placed on the parameters of N a and N b in obtaining the parameters of the twoport resulting from their interconnection. EXAMPLE 16.5 SOLUTION We wish to determine the Y parameters for the network shown in Fig a by considering it to be a parallel combination of two networks as shown in Fig b. The capacitive network will be referred to as N a, and the resistive network will be referred to as N b. The Y parameters for N a are y 11a = j 1 S y 1a = j 1 S y 1a = j 1 S y a = j 1 S and the Y parameters for N b are y 11b = 3 5 S y 1b = 1 5 S y 1b = 1 5 S y b = 5 S Hence, the Y parameters for the network in Fig are y 11 = 3 5 j 1 S y 1 = ( 1 5 j 1 y 1 = ( 1 5 j 1 ) S y = 5 j 1 S To gain an appreciation for the simplicity of this approach, you need only try to find the Y parameters for the network in Fig a directly. ) S c16twoportnetworks.indd 1
13 SECTION 16.6 INTERCONNECTION OF TWOPORTS j j (a) (b) Figure Network composed of the parallel combination of two subnetworks. Let us determine the Z parameters for the network shown in Fig a. The circuit is redrawn in Fig , illustrating a series interconnection. The upper network will be referred to as N a and the lower network as N b. The Z parameters for N a are z 11a = j 3 j Ω z 1a = 3 j Ω z 1a = 3 j Ω z a = 4j 3 j Ω and the Z parameters for N b are z 11b = z 1b = z 1b = z b = Hence, the Z parameters for the total network are z 11 = 5 4j 3 j Ω z 1 = 5 j 3 j Ω z 1 = 5 j 3 j Ω z = 5 6j 3 j Ω We could easily check these results against those obtained in Example 16.5 by applying the conversion formulas in Table EXAMPLE 16.6 SOLUTION j Figure Network in Fig a redrawn as a series interconnection of two networks. c16twoportnetworks.indd 13
14 1614 CHAPTER 16 TWOPORT NETWORKS EXAMPLE 16.7 SOLUTION Let us derive the twoport parameters of the network in Fig by considering it to be a cascade connection of two networks as shown in Fig The ABCD parameters for the identical T networks were calculated in Example 16.4 to be A = 1 jω C = jω B = jω D = 1 jω Therefore, the transmission parameters for the total network are [ A B = [ 1 jω C D jω 1 jω [ 1 jω jω 1 jω Performing the matrix multiplication, we obtain [ A B 1 4jω ω 4 6jω ω = C D [ jω ω 1 4jω ω Figure 16.1 Circuit used in Example F 1 F EXAMPLE 16.8 Fig is a perphase model used in the analysis of threephase highvoltage transmission lines. As a general rule in these systems, the voltage and current at the receiving end are known, and it is the conditions at the sending end that we wish to find. The transmission parameters perfectly fit this scenario. Thus, we will find the transmission parameters for a reasonable transmission line model and, then, given the receivingend voltages, power, and power factor, we will find the receivingend current, sendingend voltage and current, and the transmission efficiency. Finally, we will plot the efficiency versus the power factor. 150milelong transmission line R L Highvoltage substation (sending end) C C Lowervoltage substation (receiving end) V L = 300 kv P = 600 MW pf = 0.95 lagging Transmission line model Figure A πcircuit model for power transmission lines. c16twoportnetworks.indd 14
15 SECTION 16.6 INTERCONNECTION OF TWOPORTS R Z L Z C Z C =0 A = =0 Z C = Z C Z L R = Z C Z L R Z C = Z C R Z L B = =0 1 = Z L R V 1 = Z L R = Ω =0 Z C R Z L Z C V = Z C =0 Z C Z L R C = = Z C Z L R = μs =0 Z C Z C R Z L D = =0 =0 Z C = Z C Z L R = Z C Z L R Z C = Figure Equivalent circuits used to determine the transmission parameters. Given a 150milelong transmission line, reasonable values for the πcircuit elements of the transmission line model are C = 1.36 μf, R = 9.0 Ω, and L = mh. The transmission parameters can be easily found using the circuits in Fig At 60 Hz, the transmission parameters are A = C = μs B = Ω D = To use the transmission parameters, we must know the receivingend current,. Using standard threephase circuit analysis outlined in Chapter 11, we find the line current to be = 600 cos 1 (pf) = ka 3 (300)(pf) where the linetoneutral (i.e., phase) voltage at the receiving end,, is assumed to have zero phase. Now we can use the transmission parameters to determine the sendingend voltage and power. Since the linetoneutral voltage at the receiving end is = kv, the results are = A B = ( )( ) ( )( ) = kv SOLUTION c16twoportnetworks.indd 15
16 1616 CHAPTER 16 TWOPORT NETWORKS = C D = ( )(173.1) 0 ) ( )( ) = ka At the sending end, the power factor and power are pf = cos (7.67 (9.71)) = cos (37.38) = 0.80 lagging P 1 = 3 (pf) = (3)(41.9)(1.1)(0.80) = MW Finally, the transmission efficiency is η = P 600 P = = 9.3% This entire analysis can be easily programmed into an Excel spreadsheet. A plot of the transmission efficiency versus power factor at the receiving end is shown in Fig We see that as the power factor decreases, the transmission efficiency drops, which increases the cost of production for the power utility. This is precisely why utilities encourage industrial customers to operate as close to unity power factor as possible. Figure The results of an Excel simulation showing the effect of the receivingend power factor on the transmission efficiency. Because the Excel simulation used more significant digits, slight differences exist between the values in the plot and those in the text. Transmission efficiency Receivingend power factor SUMMARY Four of the most common parameters used to describe a twoport network are the admittance, impedance, hybrid, and transmission parameters. If all the twoport parameters for a network exist, a set of conversion formulas can be used to relate one set of twoport parameters to another. When interconnecting twoports, the Y parameters are added for a parallel connection, the Z parameters are added for a series connection, and the transmission parameters in matrix form are multiplied together for a cascade connection. PROBLEMS 16.1 Given the two networks in Fig. P16.1, find the Y parameters for the circuit in Fig. P16.1 (a) and the Z parameters for the circuit in Fig. P16.1 (b). Calculate (a) y 11, (b) y 1, (c) y 1, (d) y, (e) z 11, (f) z 1, (g) z 1, (h) z if Z L = 30 Ω. Z L ZL Figure P16.1 (a) (b) c16twoportnetworks.indd 16
17 PROBLEMS Find the Y parameters for the twoport network shown in Fig. P16.. Figure P Find the Y parameters ((a) y 11, (b) y 1, (c) y 1, (d) y ) for the twoport network in Fig. P Ω 3 Ω 16.7 Find the Z parameters for the twoport network in Fig. P Ω Figure P Find the Z parameters for the twoport network shown in Fig. P16.8 and determine the voltage gain of the entire circuit with a 4kΩ load attached to the output Ω 500 Ω 0 kω Figure P Determine the Y parameters for the twoport network shown in Fig. P16.4. i 8 Ω i 4 Ω Figure P Determine the admittance parameters for the network shown in Fig. P Ω 4 kω Figure P Determine a twoport network that is represented by the following Z parameters. 6 j3 5 j [Z = [ 5 j 8 j Determine the input impedance of the network shown in Fig. P16.10 in terms of the Z parameters and the load impedance Z. Z 11 Z 1 V o C Z Z 1 Z C 1 g C 3 R Figure P Find the Y parameters for the twoport network in Fig. P16.6. Z Z 1 Figure P16.6 γ Figure P Find the voltage gain of the twoport network in Fig. P16.10 if a 1kΩ load is connected to the output port Find the input impedance of the network in Fig. P Find the Y parameters for the network in Fig. P C 1 C R A C 3 L Figure P16.13 c16twoportnetworks.indd 17
18 1618 CHAPTER 16 TWOPORT NETWORKS Find the Z parameters for the network in Fig. P γ R 1 R 3 Figure P Find the Z parameters of the twoport network in Fig. P R I jωm 1 jωl 1 jωl Find the Z parameters for the twoport network shown in Fig. P kω (3)10 4 Figure P μs 16.0 Find [Z of a twoport network if [ Z = [ Determine the Z parameters for the twoport network in Fig. P16.1. R 1 : n Figure P Given the network in Fig. P16.16, (a) find the Z parameters for the transformer, (b) write the terminal equation at each end of the twoport, and (c) use the information obtained to find. 1 0 V Figure P16.16 j4 Ω j j3 Ω 4 Ω Find the Z parameters for the network in Fig. P kω R 1 Figure P16.1 Ideal 16. Determine (a) R 1, (b) R, (c) R 3 in the circuit diagram shown in Fig. P16. that has the following Y parameters. [ [ Y = 1 18 R 8 80 V A kω R 1 R 3 1 kω 0.04 V A Figure P16. Figure P Calculate and in the circuit V Z 11 = 40 Ω Z 1 = j0 Ω Z 1 = j30 Ω Z = 50 Ω 10 Ω 16.3 Determine Z 1 ((a) real part and (b) imaginary part), Z ((c) real part and (d) imaginary part), Z 3 ((e) real part and (f) imaginary part) in the circuit diagram shown in Fig. P16.3 that has the following Z parameters (all in ohms): 6 j1 4 j7 [Z = [ 4 j7 7 j4 Z 1 Z 3 Figure P16.18 Z Figure P16.3 c16twoportnetworks.indd 18
19 PROBLEMS Compute the hybrid parameters for the network in Fig. E Compute the hybrid parameters ((a) h 11, (b) h 1, (c) h 1, (d) h ) for the network in Fig. P Ω 16.9 Determine the hybrid parameters for the network in Fig. P16.9. R 1 = 30 Ω, R =, C = 170 mf, a = 0.8, v = 100 radians per second. α Figure P Ω 10.5 Ω 16.6 Find the hybrid parameters for the network in Fig. P Consider the network in Fig. P16.7. The twoport network is a hybrid model for a basic transistor. Determine the voltage gain of the entire network, /V s, if a source V s with internal resistance R 1 is applied at the input to the twoport network and a load R L is connected at the output port. I h 1 11 R 1 1 kω V S h 1 h 1 1 h R L Figure P16.9 R 1 R 1 jωc Find the ABCD parameters for the networks in Fig. P Find the transmission parameters for the network in Fig. P j Figure P16.7 Figure P Find the hybrid parameters of the twoport network. 3 Ω 6 Ω Figure P Given the network in Fig. P16.3, find the transmission parameters for the twoport network and then find I o using the terminal conditions. 34 Ω j17 Ω j34 Ω 68 Ω I o 1 0 V j34 Ω j68 Ω 6 30 V Figure P16.3 Enter arguments from 0 to π. c16twoportnetworks.indd 19
20 160 CHAPTER 16 TWOPORT NETWORKS Find the voltage gain / for the network in Fig. P16.33 using the ABCD parameters. Figure P16.33 ABCD parameters known Find the input admittance of the twoport in Fig. P16.34 if the Y parameters are y 11 = 17 S, y 1 = 16 S, y 1 = 16 S, y = 17 S and the load Y L is 8 S. Z L Draw the circuit diagram (with all passive elements in ohms) for a network that has the following Y parameters: [ 5 [ Y = Draw the circuit diagram for a network that has the following Z parameters: 6 j4 4 j6 [ Z = [ 4 j6 10 j Following are the hybrid parameters for a network: Y in Twoport Y parameters known Y L [ h 11 h 1 h 1 h [ = Figure P Find the voltage gain / for the network in Fig. P16.35 using the Z parameters. Figure P16.35 Z parameters known Z L Determine the Y parameters for the network If the Y parameters for a network are known to be [ y 11 y 1 y 1 y [ 3 = find the Z parameters ((a) z 11, (b) z 1, (c) z 1, (d) z ) Find the Z parameters ((a) z 11, (b) z 1, (c) z 1, (d) z ) if a = 3, b = 5, c = 4 S, d = Find the hybrid parameters in terms of the Z parameters Find the transmission parameters for the twoport in Fig. P16.4. j j j4 Ω j3 Ω j Figure P Find the transmission parameters for the twoport in Fig. P16.43 and then use the terminal conditions to compute I o. I 1: o j j 6 0 V (4j4)V Figure P16.43 c16twoportnetworks.indd 0
21 PROBLEMS Find the Y parameters for the network in Fig. P Z 1 Z Z Z 1 Figure P Find the Y parameters of the two port in Fig. P j4 S The Y parameters of a network are [ Y = [ Determine the Z parameters of the network Find the transmission parameters of the network in Fig. E16.4 by considering the circuit to be a cascade interconnection of three twoport networks as shown in Fig. P Ω 3 Ω 6 Ω S 3 S N a N b N c Figure P S j S j6 S Determine the Y parameters ((a) y 11, (b) y 1, (c) y 1, (d) y ) for the network shown in Fig. P Z 1 Z Figure P Find the transmission parameters of the circuit. 4 Ω 8 Ω 6 Ω Figure P Find the transmission parameters for the twoport network. Z 4 Z 5 I 3 1 I 10 Ω Z 6 Z 3 0 Ω Figure P Find the Y parameters of the twoport network in Fig. P Find the input admittance of the network when the capacitor is connected to the output port. j Figure P Find the ABCD parameters for the circuit in Fig. P H 1 F Figure P16.5 Y in j Figure P16.47 c16twoportnetworks.indd 1
22 16 CHAPTER 16 TWOPORT NETWORKS Determine the output voltage V o in the network in Fig. P16.53 if the Z parameters for the twoport are Z = [ V V A V B 60 A j j Twoport V o Figure P Find the Z parameters for the twoport network in Fig. P16.54 and then determine I o for the specified terminal conditions. 8 Ω j j4 Ω 3 Ω j j j3 Ω 57 0 V I o Figure P16.54 Enter arguments from 0 to π Determine the output voltage V o in the network in Fig. P16.55 if the Z parameters for the twoport are Z = [ V V A V B 60 A j j Twoport V o Enter arguments from 0 to π. Figure P Find the transmission parameters of the twoport in Fig and then use the terminal conditions to compute I o. 1 : I o 10 Ω j6 Ω 9 Ω j3 Ω 4 45 V Ideal Figure P The h parameters of a circuit are given as h 11 = 600 Ω, h 1 = 10 3, h 1 = 10, h = 10 6 S Draw a circuit model of the device including the value of each element. c16twoportnetworks.indd 1/04/15 4:55 pm
23 TYPICAL PROBLEMS FOUND ON THE FE EXAM 163 TYPICAL PROBLEMS FOUND ON THE FE EXAM 16PFE1 A twoport network is known to have the following parameters: y 11 = 1 14 S y 1 1 = y 1 = 1 S y = 1 7 S If a A current source is connected to the input terminals as shown in Fig. 16PFE1, find the voltage across this current source. 16PFE4 Find the Z parameters of the network shown in Fig. 16PFE4. 6 Ω 1 3 Ω A Twoport Figure 16PFE1 a. 36 V c. 4 V b. 1 V d. 6 V 16PFE Find the Thévenin equivalent resistance at the output terminals of the network in Fig. 16PFE1. a. 3 Ω c. 1 b. 9 Ω d. 6 Ω 16PFE3 Find the Y parameters for the twoport network shown in Fig. 16PFE3. Figure 16PFE4 a. z 11 = 19 3 Ω, z 1 = 5 3 Ω, z = 7 3 Ω b. z 11 = 5 Ω, z 1 = 7 5 Ω, z = 9 5 Ω c. z 11 = 36 7 Ω, z 1 = 1 7 Ω, z = 18 7 Ω d. z 11 = 7 6 Ω, z 1 = 7 6 Ω, z = 13 6 Ω 16PFE5 Calculate the hybrid parameters of the network in Fig. 16PFE5. 8 Ω 4 Ω 16 Ω 4 Ω 8 Ω Figure 16PFE3 a. y 11 = 5 3 S, y 1 = y 1 = 5 14 S, y = 9 14 S b. y 11 = 7 48 S, y 1 = y 1 = 3 16 S, y = 7 16 S c. y 11 = 3 5 S, y 1 = y 1 = 1 15 S, y = 4 15 S d. y 11 = 3 56 S, y 1 = y 1 = 1 8 S, y = 3 8 S Figure 16PFE5 a. h 11 = 8 3 Ω, h 1 = 3, h 1 = 3, h = 1 6 S b. h 11 = 16 5 Ω, h 1 = 1 5, h 1 = 1 5, h = 3 10 S c. h 11 = 19 4 Ω, h 1 = 3 4, h 1 = 3 4, h = 5 8 S d. h 11 = 3 9 Ω, h 1 = 9, h 1 = 9, h = 1 18 S c16twoportnetworks.indd 3
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