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Chapter 18 Two-Port Circuits

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Chapter 18 Two-Port Circuits Chapter 18 Two-Port Circuits 18.1 The Terminal Equations 18.2 The Two-Port Parameters 18.3 Analysis of the Terminated Two-Port Circuit 18.4 Interconnected Two-Port Circuits 1 Motivation Thévenin and Norton equivalent circuits are used in representing the contribution of a circuit to one specific pair of terminals. Usually, a signal is fed into one pair of terminals (input port), processed by the system, then extracted at a second pair of terminals (output port). It would be convenient to relate the v/i at one port to the v/i at the other port without knowing the element values and how they are connected inside the “black box”. 2 How to model the “black box”? Source Load (e.g. (e.g. CD speaker) player) We will see that a two-port circuit can be modeled by a 22 matrix to relate the v/i variables, where the four matrix elements can be obtained by performing 2 experiments. 3 Restrictions of the model No energy stored within the circuit. No independent source. Each port is not a current source or sink, i.e. i1 i, 1 i 2 i 2. No inter-port connection, i.e. between ac, ad, bc, bd. 4 Key points How to calculate the 6 possible 22 matrices of a two-port circuit? How to find the 4 simultaneous equations in solving a terminated two-port circuit? How to find the total 22 matrix of a circuit consisting of interconnected two-port circuits? 5 Section 18.1 The Terminal Equations 6 s-domain model The most general description of a two-port circuit is carried out in the s-domain. Any 2 out of the 4 variables {V1, I1 , V2 , I2 } can be determined by the other 2 variables and 2 simultaneous equations. 7 Six possible sets of terminal equations (1) V1 z11 z 12 I1 ; is the Z impedance matrix; V2 z21 z 22 I2 I y y V ; 1 11 is 12 1 theYZ - 1 admittance matrix; I2 y21 y 22 V2 V1 a 11 12 a V2 ; is A siona transmis matrix; I1 a 21 a22 I2 V b b V 2 11; 12 1 BAis - 1 siona transmis matrix; I2 b 21 22 b I1 8 Six possible sets of terminal equations (2) V1 h11 h 12 I1 ; is a H hybrid matrix; I2 h21 h 22 V2 I g g V 1 ; 11 12 1isGH a - 1 hybrid matrix; V2 g21 g 22 I2 Which set is chosen depends on which variables are given. E.g. If the source voltage and current {V1 , I1} are given, choosing transmission matrix [B] in the analysis. 9 Section 18.2 The Two-Port Parameters 1. Calculation of matrix [Z] 2. Relations among 6 matrixes 10 Example 18.1: Finding [Z] (1) Q: Find the impedance matrix [Z] for a given resistive circuit (not a “black box”): V1 z11 z 12 I1 V2 z21 z 22 I2 By definition, z11 =(V1 /I1) when I2, =0i.e. the input impedance when port 2 is open. z11 = (20 )//(20 0)=1. 11 Example 18.1: (2) By definition, z21 =(V2 /I1) when I2, =0i.e. the transfer impedance when port 2 is open. When port 2 is open: 15 V VV0 . 75 , 52 15 1 1 V1 V1 z11 10 ,I 1 , I1 10 V2 0 . 75V1 z21 7 . 5 . I1 (V1 10 ) 12 Example 18.1: (3) By definition, z22 = (V2 /I2 ) when I1, =0i.e. the output impedance when port 1 is open. z22 = (15 )//(25 =9.375 ) . z12 =(V1 /I2) when I1, =0 2 0 V VV0 . 8 , 21 0 5 2 2 V2 V2 9z22 . 375 I 2, , I2 9 . 375 V1 0 .V 82 z12 7 . 5 . I2( 9V2 . 375 ) 13 Comments When the circuit is well known, calculation of [Z] by circuit analysis methods shows the physical meaning of each matrix element. When the circuit is a “black box”, we can perform 2 test experiments to get [Z]: (1) Open port 2, apply a current I1 to port 1, measure the input voltage V1 and output voltage V2 . (2) Open port 1, apply a current I2 to port 2, measure the terminal voltages V1 and V2 . 14 Relations among the 6 matrixes If we know one matrix, we can derive all the others analytically (Table 18.1). [Y]=[Z]-1, [B]=[A]-1, [G]=[H]-1, elements between mutually inverse matrixes can be easily related. E.g. 1 z11 z 12 y11 y 12 1 y22 12 y , z21 z 22 y21 y 22 y y21 11 y wherey Y11det y 22 y 12 y. 21 y 15 Represent [Z] by elements of [A] (1) [Z] and [A] are not mutually inverse, relation between their elements are less explicit. By definitions of [Z] and [A], V1 z11 z 12 I1 V1 a 11 12 a V2 , , V2 z21 z 22 I2 I1 a 21 a22 I2 the independent variables of [Z] and [A] are {I1 , I2 } and {V2 , I2} , respectively. Key of matrix transformation: Representing the distinct independent variable V2 by {I1 , I2 }. 16 Represent [Z] by elements of [A] (2) By definitions of [A] and [Z], V1 a 11 V 2 12 a( 12 I ) I1 a 21 V 2 a 22( I 2 2 ) 1 a22 ( 2 ) V 2 I1 I2 z 21 I 1 z 22( I 3 2 ), a21 a21 1 a 22 ( 1 ), ( 3V1 ) a 11 I1 I2 a 12 I 2 a21 a21 a a a 11 11 22 I1 a12 I 2 z 11 I 1 z 12( I 4 2 ) a21 a21 z z 1 a a 11 12 ,11 wherea A det . z z a 1 a 21 22 21 22 17 Section 18.3 Analysis of the Terminated Two-Port Circuit 1. Analysis in terms of [Z] 2. Analysis in terms of [T][Z] 18 Model of the terminated two-port circuit A two-port circuit is typically driven at port 1 and loaded at port 2, which can be modeled as: The goal is to solve {V1 , I1 , V2 , I2} as functions of given parameters Vg , Zg , ZL, and matrix elements of the two-port circuit. 19 Analysis in terms of [Z] Four equations are needed to solve the four unknowns {V1 , I1 , V2 , I2} . V1 11 z I 1 z 12( I 12 ) two -equations port V2 21z I 1 z 22( I 2 2 ) VVIZ 1g 1 g ( 3 ) constraint equations dueons to terminati VIZ 2 2 L ( 4 ) 1 0 z11 z 12 V1 0 {V1 , I1 , V2, I2 } are 0 1z21 z 22 V2 0 , derived by inverse 1 0Z g 0 I1 Vg matrix method. 0 1 0 ZL I2 0 20 Thévenin equivalent circuit with respect to port 2 Once {V1 , I1 , V2 , I2} are solved, {VTh , ZTh } can be determined by ZL and {V2 , I2} : Z V L V ( 1 ) 2 Th ZZTh L VV2 Th I2 ( 2 ) ZTh 1 ZV L 2 VTh VZ 2 L VTh ZV L 2 VZ 2 L ; . 1 I2 ZTh V2 ZTh 1 I2 V2 21 Terminal behavior (1) The terminal behavior of the circuit can be described by manipulations of {V1 , I1, V2 , I2 }: V1 z12 z 21 Input impedance: Zin z11 ; I1 z22 ZL z21 Vg Output current: I ; z2 ( Z )( z Z ) z z 11 g 22 L 12 21 I z Current gain: 2 21 ; I1 z22 ZL V2 z21 ZL Voltage gains: ; V1 z11 ZL z V z Z 2 21 L ; Vzg (11 Zg )( z22 ZL )12 z 21 z 22 Terminal behavior (2) z21 Thévenin voltage: VTh Vg ; z11 Zg z12 z 21 mpedance:iThévenin ZTh22 z ; z11 Zg 23 Analysis in term of a two-port matrix [T][Z] If the two-port circuit is modeled by [T][Z], T={Y , A, B, H, G}, the terminal behavior can be determined by two methods: Use the 2 two-port equations of [T] to get a new 44 matrix in solving {V1 , I1, V2 , I2 } (Table 18.2); Transform [T] into [Z] by Table 18.1, borrow the formulas derived by analysis in terms of [Z]. 24 Example 18.4: Analysis in terms of [B] (1) Q: Find (1) output voltage V2 , (2,3) average powers delivered to the load P2 and input port P1 , for a terminated two-port circuit with known [B]. Rg V g RL 20 3 k-b12 B 2 mS 0 .-b22 2 25 Example 18.4 (2) Use the voltage gain formula of Table 18.2: V bZ 2 L ; bVg b12 Z 11g b22 ZL 21 g b L Z Z (b 11 20 b 22 b )( 0 12b . b2 21 ) ( 3 k )( 2 mS ) 4 6 2 , V ( 2 )( 5 k ) 10 2 , ( 3 k ) (V g 20 )( 0 . 5 k ) ( 0 . 2 )( 19 5 k ) ... 10 500V 0 263 . 16 0 V . 2 19 26 Example 18.4 (3) The average power of the load is formulated by 2 2 1 V22631 . 16 0 V P2 6 . 93 W . 2 RL 2 5 k The average power delivered to port 1 is 1 2 formulated byPIZ Re . 1 2 1 in V1 b(22 Z 0L .12 2 b )( 5 k ) ( 3 k ) Zin 133 . 33 ; I1 b(21 ZL 2 11 b mS )( 5 k ) 20 V g 500 0 V I1 0 . 789 0 A, (ZZg 500 in ) ( 133 . 33 ) 1 2 ( 0 . 789P1 ) ( 133 . 33 ) 41 . 55 W. 2 27 Section 18.4 Interconnected Two-Port Circuits 28 Why interconnected? Design of a large system is simplified by first designing subsections (usually modeled by two-port circuits), then interconnecting these units to complete the system.
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