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Cairo University Prof. Afaf Abdel-FattahFaculty of Engineering Circuits(2) ELC 202 ADepartment of Electronics & Electrical Communications Term (I)

Question[1]:a)Derive an expression of the input and output impedances of the two-port network shown

in figure in terms of the H-parameters of the network, the internal impedance of thesource Zgand the load impedance ZL.

b)If the network parameters are given by :

VV

Z

mhoH

og

g

0250

1500

5050

101500 3

Calculate:

i)The maximum average power delivered to the load.

ii)The average power delivered to the input port of the network at the condition ofmaximum power transfer to the load.

Insert your results in Table 1.

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Zin

Zout

PL

Pin

Table 1

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Cairo University Prof. Afaf Abdel-FattahFaculty of Engineering Circuits(2) ELC 202 ADepartment of Electronics & Electrical Communications Term (I)

Question[2]:The H-parameters of a two-port network are given by the matrix :

mhoH

1.04

2.02

a)Check the conditions of symmetry and reciprocity of the network.

b)Sketch its equivalent circuit.

c)If two resistors of 2 and 5 areaddedto the network as shown in figure, calculate

the H-parameters of the total network.

Insert your results in Table 2.

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Table 2

Is the net. sym. ?

Is the net. recip. ?

Equivalent Circuit

[H]

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Cairo University Prof. Afaf Abdel-FattahFaculty of Engineering Circuits(2) ELC 202 ADepartment of Electronics & Electrical Communications Term (I)

Question[3]:a)Calculate the transmission A-parameters of a two-port network as a function of its

Hybrid H-parameters.

b)The amplifier circuit shown in figure is formed of two identical stages each having the

Hybrid H-parameters given by :

mhom

KH

.1.0100

001.01

What is the value of the input voltage Vsrequired to obtain an output voltage Vo of

25 volts ?

Insert your results in Table 3.

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Question[4]:a)Two sets of measurements were made on the two-port network Nshown in figure .Theresults were as follows :

Measurement 1 Measurement 2

V1=20 mV V1=4 VI1=20 A I1=5 mA

V2=40 V V2=0

I2=0 I2=-200 mA

Find the H-parameters representing the two-port network.

b)Using the H-parameters, calculate the value of the variable resistanceRowhen adjusted

to receive maximum power and find the value of this power.

Insert Your results in Table 4.

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[H]

Ro

Pmax.

Table 4

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Cairo University Prof. Afaf Abdel-FattahFaculty of Engineering Circuits(2) ELC 202 ADepartment of Electronics & Electrical Communications Term (I)

Question[5]:a)Using the Y-parameters, calculate the input admittance to a two-port network loaded

with a load impedance ZL.

b)The network N shown in figure has the Y-parameters given by :

mhoY

)10

1()

10

1(

)51()

52(

Calculate the output voltage Voof the network.

Insert your results in Table 5.

+

_

Ix 2 2

1

+_

2 Ix

2

5

+

_

VoV

o306

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Vo

Table 6

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I1

I2

P2

---- %

Pg

Table 8

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(V2/V1) =

(I2/I1) =

(I2/Is) =

Table 9

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Cairo University Prof. Afaf Abdel-FattahFaculty of Engineering Circuits(2) ELC 202 ADepartment of Electronics & Electrical Communications Term (I)

V2

PL

(PL/Pg) %

Table 10

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Vo

)%(/11P

L