1. Lecturer: Pn. Wan Nur Suryani Firuz Bt Wan Ariffin (012-4820815)
TWO-PORT NETWORK
TKT 419/3
Sem 1 Sidang Akademik 2010/2011
Lecturer: Pn. Wan Nur Suryani Firuz Bt Wan Ariffin ( )

2. Relationships among two-port parameters
TWO-PORT NETWORK
Terminal equations
Two-port parameters
Relationships among two-port parameters
Analysis of terminated two-port circuit
Interconnected two-port circuits

3. s-domain two-port basic building block
TERMINAL EQUATIONS
s-domain two-port basic building block

4. Terminal equations relationships
1st Relationship:

5. 2nd Relationship:

6. 3rd Relationship:

7. 4th Relationship:

8. 5th Relationship:

9. 6th Relationship:

10. Relationships between parameters
TWO PORT NETWORK:
Terminal equations
Two-port parameters
Relationships between parameters
Analysis of terminated two-port circuit
Interconnected two-port circuits

11. IMPEDANCE PARAMETERS
z parameters

12. ADMITTANCE PARAMETERS y parameters

13. a parameters

14. a and b parameters are called transmission parameters

15. HYBRID PARAMETERS h parameters

16. INVERSE HYBRID PARAMETERS g parameters

17. Find z parameter for the below circuit:
Example 1
Find z parameter for the below circuit:

18. When port 2 open-circuit, I2=0 so,
Solutions:
When port 2 open-circuit, I2=0 so,

19. When I2=0, thus V2

20. Now, when I1=0,so

21. When port 1 open-circuit, I1=0, so:

22. TWO-PORT NETWORK
Terminal equations
Two-port parameters
Relationships between parameters
Analysis of terminated two-port circuit
Interconnected two-port circuits

23. RELATIONSHIPS BETWEEN PARAMETERS

25. Compare these two above equations:

26. Find z parameters as functions of a parameters

27. Therefore,

28. RECIPROCAL TWO-PORT CIRCUITS
If a two-port circuit is reciprocal, the following relationships exist among port parameters:

29. Symmetric of a reciprocal two-port circuits
Following relationships exist among port parameters:

30. Example of symmetric two-port circuits
Symmetric tee

31. Symmetric pi

32. Symmetric bridge tee

33. Symmetric lattice

34. TWO-PORT NETWORK
Terminal equations
Two-port parameters
Relationships between parameters
Analysis of terminated two-port circuit
Interconnected two-port circuits

35. ANALYSIS OF TERMINATED TWO-PORT CIRCUITS

36. 6 characteristics of terminated two-port circuit
Input impedance (Zin=V1/I1) or admittance (Yin=I1/V1)
Output current, I2
Thevenin voltage and impedance (ZTh, VTh) with respect to port 2
Current gain I2/I1
Voltage gain V2/V1
Voltage gain V2/Vg

37. 6 characteristics in term of z parameters
4 parameter equations that describe the circuit:

38. 1st characteristic (input impedance)

39. 2nd characteristic (output current, I2)

40. 3rd characteristic (Thevenin voltage @ impedance)

41. Impedance Thevenin

42. 4th characteristic (current gain)

43. 5th characteristic (voltage gain V2/V1)

45. 6th characteristic (voltage gain V2/Vg)

47. TWO-PORT NETWORK
Terminal equations
Two-port parameters
Relationships between parameters
Analysis of terminated two-port circuit
Interconnected two-port circuits

48. INTERCONNECTED TWO-PORT CIRCUITS

49. Cascade connection

50. Two-port parameters

51. Interconnection (V’2=V’1 and I’2= -I’1)

52. Relationship V’1 and I’1 with V2 and I2 in second circuit :

54. Reference book
Electric Circuits, James W. Nilsson and Susan A. Riedel, Prentice Hall