1. SABIKA FATIMA EEE NETWORK THEORY B.TECH II YR I SEM

2. On topic Two-Port Networks

3. Port
A port of a network consists of two terminals — one for the entry of current and other for its exit.
The currents in the two terminals of a port are equal.
‘Porte’ in French means ‘door’.

4. Two-Port Network
The port variables are port currents I1 and I2 and the port voltages V1 and V2.
Note the reference directions of currents and voltages.

5. Assume linear time-invariant elements.
May contain dependent sources but not independent sources.
We need two linear equations in port-variables to characterize such a two-port network.
Two can be taken as the independent variables and the remaining two as the dependent variables.
The choice is just a matter of convenience for a given applications.

6. Six Possibilities Open-circuit, impedance, or z-parameters.
Short-circuit, admittance, or y-parameters.
Hybrid, or h-parameters.
Inverse hybrid, or g-parameters.
Transmission, or ABCD-parameters.
Inverse transmission, or abcd-parameters

8. OPEN-CIRCUIT, IMPEDANCE, OR z-PARAMTERS
Impedance Matrix

9. 1. Input driving point impedance,
2. Reverse transfer impedance,

10. 3. Forward transfer impedance,
4. Output driving point impedance,

11. Equivalent Circuit Using z-parameters
It is just a picturization of the defining equations.

12. Alternate way of drawing the equivalent circuit.

13. Conditions for Reciprocity
A network is said to be reciprocal, if

14. Condition for Symmetry
A two-port network is said to be symmetrical if its ports can be interchanged without changing the port voltages and currents.

15. SHORT-CIRCUIT, ADMITTANCE, OR y-PARAMTERS
Admittance Matrix

16. 1. Input driving point admittance,
2. Reverse transfer admittance ,

17. 3. Forward transfer admittance
4. Output driving point admittance

18. Equivalent Circuit Using y-Parameters
Picturizing the defining equations,

19. Alternatively,

20. Conditions for Reciprocity and Symmetry

21. Review Multi-Port Networks. Two-Port Network.
Six Possibilities of Characterization.
open-circuit, impedance, or z-paramters.
Equivalent Circuit Using z-parameters .
Conditions for Reciprocity and Symmetry.
Short-circuit, admittance, or y-paramters.
Equivalent Circuit Using y-Parameters.